Question about 1996 Ford F150 Regular Cab

3 Answers

96 Ford truck engine lIght will not go away.

96 F-150 351w, 2wheel drive, ext cab. I have been fighting a check engine light for about a year now. The code says that all three O2 sensors pop for something about "heater." I have replaced all o2 sensors, EGR valve, thermostat, air inlet temp sensor, fuel pressure regulator, and about to change the coolant temp sensor. The truck has never overheated or have gotten hot for that matter. Symtoms, running rich and at fuel throttle, light black smoke. After resetting computer, the first start will not trigger the light, I drove one time for over 250 miles and no light. As soon as I turn it off and back on again no matter the length of time the check engine light comes on in about 10-15 seconds. Timming is good. Any ideas?

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  • 2 more comments 
  • Dwight Oct 02, 2008

    I feel a little dumb but, I said that I would reset my computer and problem kept comming back, which was true. I just got new tires at Pep boys and for sh*t and giggles I had them check my codes again. The one that I origialy claimed was not there. There was two codes in history and they cleared them out. Started the Truck and the check engine light did not come on until about 5 min later. Checked code, one O2 sensor was malfunctioning. Pep boys did not have an O2 sensor in stock will, replace tomorrow and re-post. Hopefully this will do it.

    Question: Do codes disapper? And would one OBO2 reader tell something different than another?

  • Dwight Oct 03, 2008

    Thanks for the input, I,ve been trying to avoid taking it to a shop and have it run but if that is what I got to do then, thats it. I apprietiate it.

  • Dwight Jan 06, 2010

    It was the computer.

  • Anonymous Mar 17, 2014

    LDV maxus 2.8 EGR valve been fitted and blanked off with plate Black exhaust problem still exisits as does the hunting tick over, also van runs away when throttle not in use, engine temp never rises above a quarter or fan not turning.Have put engine cleaner in fuel and ran at 70-80 mph for 50 miles , engine never missed a beat, Any suggestions/ideas what the problem could be?

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3 Answers

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  • Master
  • 1,263 Answers

This is the problem with code readers they bwill tell you the code and sometimes even have a reset feature. However they do not tell you the parameters and don't have an drivability feature so you can not test the ecm and all the sensors or modules while engine is running. diagnostic scan tools are very expensive and hard to use unless you have been trained to do so and PEP BOYs is not what I call real reliable mechanics to begin with. Now I concure with toddG on his reasoning in what might be the potential fault. if your vehicle is running rich or lean your O2 sensor will pick this up on the exaust side, however it is not the sole sensor responsible for the ecm adjusting the fuel air mixture.. you stated that you have switched out several o2 sensors and the fuel pressure regulator, but there is also you mass air flow sensor, your TPS sensor, as well as your map sensor these are worth checking out and just because a faulty sensor is the problem doesn't mean you will get a code each time. the system is built with redundancy in order to keep the vehicle running. in order to get the best possible diagnois take it to a shop where they have a full diagnostic scanner this will have not only OBD1 and OBD2 but cam protocol as well. while the tech is scanning the vehicle he will be able to see how the engine is performing under realtime conditions. please rate this as well as change the rating for toddg because he did offer a valid suggestion

Posted on Oct 02, 2008

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  • Master
  • 360 Answers

Can you give me all the codes????? pcm in this truck has problems and i wanted to cross the codes against this.......

Posted on Oct 02, 2008

  • 1 more comment 
  • Jimmy
    Jimmy Oct 02, 2008

    The Malfunction Indicator Lamp (MIL) keeps coming on with a code P0155 for the Oxygen (O2) sensor heater circuit for bank 2, sensor 1. Has a new O2 sensor, and the circuit tests out fine with an ohmmeter. The Powertrain Control Module (PCM) is grounding the circuit momentarily after the engine starts, then the ground goes away. Replaced the PCM, but the same code still sets. the fix ................ Found a poor connection in the wiring harness feeding the left front sensor, in the harness right by the power steering pump

  • Jimmy
    Jimmy Oct 02, 2008

    i forgot you could have a stuck open Canister Purge Solenoid. this would explain the light black smoke at full throttle . good luck jimmy.......

  • Jimmy
    Jimmy Oct 03, 2008

    i did forget the fuse box has a power supply to the 02 heater. the computer gives the ground and monitors the input. if it doesnt see power the computer will set the code right away.it looks like fuse number 5.

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  • Expert
  • 171 Answers

Check the Crankshaft Position Sensor

The CP sensor is mounted on the right front of some V8 engines, is a variable reluctance sensor triggered by a trigger pulse wheel (36 minus 1 tooth). Its purpose is to provide the PCM with an accurate ignition timing reference (when the piston reaches 10 degrees BTDC) and injector operation information (twice each crankshaft revolution). The crankshaft vibration damper is fitted with a 4 lobe pulse ring. As the crankshaft rotates, the pulse ring lobes interrupt the magnetic field at the tip of the CP sensor.

TESTING
Using DVOM on the AC scale and set to monitor less than 5V, measure voltage between the sensor Cylinder Identification (CID) terminal and ground. The sensor is okay if the voltage reading varies more than 0.1V AC with the engine running at varying RPM.

Posted on Sep 24, 2008

  • 3 more comments 
  • Todd Gale
    Todd Gale Sep 24, 2008

    If the Crankshaft Position Sensor is OK



    The Camshaft Position Sensor, is a Hall-effect sensor that generates a digital frequency while windows in a target wheel pass through its magnetic field. The frequency of the windows passing by the sensor, as well as the width of selected windows, allows the PCM to detect engine speed and position.



    TESTING

    Two-Wire Sensors


    1. With the ignition OFF, install a Breakout Box.
    2. Connect CMP sensor and ECM.
    3. Using DVOM on AC scale and set to monitor less than 5V, measure voltage between Breakout Box terminals 24 and 46 with the engine running at varying RPM. If the voltage reading varies more than 0.1V AC, the sensor is okay.
    Three-Wire Sensors


    1. With the ignition OFF, disconnect the CMP sensor. With the ignition ON and the engine OFF, measure the voltage between sensor harness connector VPWR and PWR GND terminals (refer to the figure). If the reading is greater than 10.5V, the power circuit to the sensor is okay.
    2. With the ignition OFF, install a Breakout Box. Connect CMP sensor and PCM. Using DVOM on AC and scale set to monitor less than 5V, measure voltage between Breakout Box terminals 24 and 40 with the engine running at varying RPM. If the voltage reading varies more than 0.1V AC, the sensor is okay.
    REMOVAL & INSTALLATION



    1. Disconnect the camshaft position sensor wiring.
    2. Remove the bolt, then the camshaft position sensor.
    To install:


    1. Install the CMP sensor and bolt in place.
    2. Engage the wiring connector.

  • Todd Gale
    Todd Gale Sep 24, 2008

    Here is the information on the heated oxygen sensor



    OPERATION

    Heated oxygen sensors are located in the exhaust pipes below the exhaust manifolds. The sensors react with the oxygen in the exhaust gasses and generates a voltage based on this reaction. A low voltage indicates too much oxygen or a lean condition. Where as a high voltage indicates not enough oxygen or a rich condition.



    TESTING


    1. Disconnect the Oxygen Sensor (O2S). Measure resistance between PWR and GND (heater) terminals of the sensor. If the reading is about 6 ohms at 68°F (20°C). the sensor's heater element is okay.
    2. With the O2S connected and engine running, measure voltage with DVOM between terminals HO2S and SIG RTN (GND) of the oxygen sensor connector. If the voltage readings are about equal to those in the table, the sensor is okay.

    REMOVAL & INSTALLATION


    1. Disconnect the negative battery cable.
    2. Raise and safely support the vehicle.
    3. Disconnect the heated oxygen sensor from the engine control sensor wiring.

    If excessive force is needed to remove the sensors, lubricate the sensors with penetrating oil prior to removal.


    1. Remove the sensors from the Y pipe or left manifold with a sensor removal tool T94P-9472-A or equivalent.

    To install:


    1. Install the sensor in its correct location, tighten to 26-34 ft. lbs. (36-46 Nm).
    2. Connect the sensor electrical wiring.
    3. Lower the vehicle.
    4. Connect the negative battery cable.

  • Todd Gale
    Todd Gale Sep 24, 2008

    Reverify your code faults


    • Code 11-System pass
    • Code 12-RPM unable to reach upper test limit
    • Code 13-RPM unable to reach lower test limit
    • Code 14-Pip circuit failure
    • Code 15-PCM read only memory test failed
    • Code 15-PCM keep alive memory test failed
    • Code 16-IDM signal not received
    • Code 18-SPOUT circuit open or spark angle word failure
    • Code 18-IDM circuit failure or SPOUT circuit grounded
    • Code 19-Failure in PCM internal voltage
    • Code 21-ECT out of self-test range
    • Code 22-BP sensor out of self-test range
    • Code 22-BP sensor or MAP out of range
    • Code 23-TP sensor out of self-test range
    • Code 24-ACT sensor out of self-test range
    • Code 25-Knock not sensed during dynamic test
    • Code 26-VAF/MAF out of self-test range
    • Code 26-TOT out of self-test range
    • Code 26-TOT sensor out of self-test range (E-400)
    • Code 28-Loss of IDM, right side
    • Code 29-Insufficient input from vehicle speed sensor
    • Code 31-PFE, EVP or EVR circuit below minimum voltage
    • Code 32-EVP voltage below closed limit
    • Code 33-EGR valve opening not detected
    • Code 34-EVP voltage above closed limit
    • Code 35-PFE or EVP circuit above closed limit
    • Code 41-HEGO sensor circuit indicates system lean
    • Code 41-No HEGO switching detected
    • Code 42-HEGO sensor circuit indicates system rich
    • Code 44-Thermactor air system inoperative-right side
    • Code 45-Thermactor air upstream during self-test
    • Code 45-Coil 1, 2 or 3 failure
    • Code 46-Thermactor air not bypassed during self-test
    • Code 47-4WD switch closed (E40D)
    • Code 48-Loss of IDM, left side
    • Code 49-1-2 shift error (E40D)
    • Code 51-ECT/ACT reads -40°F or circuit open
    • Code 52-Power steering pressure switch circuit open
    • Code 52-Power steering pressure switch always open or closed
    • Code 53-TP circuit above maximum voltage
    • Code 54-ACT sensor circuit open
    • Code 56-VAF or MAF circuit above maximum voltage
    • Code 56-TOT reads -40°F or circuit open (E40D)
    • Code 59-2-3 shift error (E40D)
    • Code 61-ECT reads 254°F or circuit grounded
    • Code 63-TP circuit below minimum voltage
    • Code 64-ACT sensor grounded or input reads 254°F
    • Code 65-Overdrive cancel switch open, no change seen (E40D)
    • Code 66-MAF sensor input below minimum voltage
    • Code 66-TOT grounded or reads 290°F (E40D)
    • Code 67-Neutral/drive switch open or A/C on
    • Code 67-Clutch switch circuit failure
    • Code 67-MLP sensor out of range or A/C on (E40D)
    • Code 69-3-4 shift error
    • Code 72-Insufficient MAF/MAP change during dynamic test
    • Code 73-Insufficient TP change during dynamic test
    • Code 74-Brake on/off switch failure or not actuated
    • Code 77-Operator error
    • Code 79-A/C on during self-test
    • Code 79-A/C or defrost on during self-test
    • Code 81-Air management 2 circuit failure
    • Code 82-Air management 1 circuit failure
    • Code 84-EGR vacuum solenoid circuit failure
    • Code 85-Canister purge solenoid circuit failure
    • Code 86-Shift solenoid circuit failure
    • Code 87-Fuel pump primary circuit failure
    • Code 88-Loss of dual plug input control
    • Code 89-Converter clutch solenoid circuit failure
    • Code 91-Shift solenoid 1 circuit failure (E40D)
    • Code 92-Shift solenoid 2 circuit failure (E40D)
    • Code 93-Coast clutch solenoid circuit failure (E40D)
    • Code 94-Converter clutch solenoid circuit failure (E40D)
    • Code 95-Fuel pump secondary circuit failure- PCM to ground
    • Code 96-Fuel pump secondary circuit failure-battery to PCM
    • Code 97-Overdrive cancel indicator light-circuit failure(E40D)
    • Code 98-Electronic pressure control driver open in PCM (E40D)
    • Code 98-Hard fault present
    • Code 99-Electronic pressure control circuit failure (E40D)
    • Code 111-System pass
    • Code 112-ACT sensor circuit grounded or reads 254° F
    • Code 113-ACT sensor circuit open or reads -40° F
    • Code 114-ACT outside test limits during KOEO or KOER tests
    • Code 116-ECT outside test limits during KOEO or KOER tests
    • Code 117-ECT sensor circuit grounded
    • Code 117-ECT sensor circuit below minimum voltage or reads 254°F
    • Code 118-ECT sensor circuit open
    • Code 118-ECT sensor circuit below maximum voltage or reads -40°F
    • Code 121-Closed throttle voltage higher or lower than expected
    • Code 122-TP sensor circuit below minimum voltage
    • Code 123-TP sensor circuit below maximum voltage
    • Code 126-BP or MAP sensor higher or lower than expected
    • Code 128-MAP vacuum circuit failure
    • Code 129-Insufficient MAF or MAP change during dynamic responded test
    • Code 144-No HEGO switching detected
    • Code 167-Insufficient TP change during dynamic response test
    • Code 171-Fuel system at adaptive limit, HEGO unable to switch
    • Code 172-HEGO shows system always lean
    • Code 173-HEGO shows system always rich
    • Code 174-HEGO switching time is slow
    • Code 179-Fuel at lean adaptive limit at part throttle; system rich
    • Code 181-Fuel at rich adaptive limit at part throttle; system lean
    • Code 182-Fuel at lean adaptive limit at idle; system rich
    • Code 183-Fuel at rich adaptive limit at idle; system lean
    • Code 211-PIP circuit fault
    • Code 212-Loss of IDM input to PCM or SPOUT circuit grounded
    • Code 213-Spout circuit open
    • Code 224-Erratic IDM input to processor
    • Code 225-Knocked not sensed during dynamic response test
    • Code 311-Thermactor air system inoperative
    • Code 312-Thermactor air upstream during self-test
    • Code 313-Thermactor air not bypassed during self-test
    • Code 327-EVP or DPFE circuit below minimum voltage
    • Code 328-EGR closed voltage higher than expected
    • Code 332-Insufficient EGR flow detected
    • Code 334-EGR closed voltage higher than expected
    • Code 337-EVP or DPFE circuit above maximum voltage
    • Code 411-Cannot control rpm during KOER low rpm check
    • Code 412-Cannot control rpm during KOER high rpm check
    • Code 452-Insufficient input from vehicle speed sensor
    • Code 511-EEC processor ROM test failed
    • Code 512-EEC processor Keep Alive Memory test failed
    • Code 513-Failure in EEC processor internal voltage
    • Code 519-Power steering pressure switch circuit open
    • Code 521-Power steering pressure switch did not change state
    • Code 525-Vehicle in gear or A/C on during self-test
    • Code 536-Brake on/off circuit failure, switch not actuated during KOER test
    • Code 538-Insufficient RPM change during KOER dynamic response test
    • Code 538-Operator error
    • Code 542-Fuel pump secondary circuit failure: PCM to ground
    • Code 543-Fuel pump secondary circuit failure: Battery to PCM
    • Code 552-Air management 1 circuit failure
    • Code 553-Air management 2 circuit failure
    • Code 556-Fuel pump primary circuit failure
    • Code 558-EGR vacuum regulator circuit failure
    • Code 565-Canister purge circuit failure
    • Code 569-Canister purge 2 circuit failure
    • Code 617-1-2 shift error (E40D)
    • Code 618-2-3 shift error (E40D)
    • Code 619-3-4 shift error (E40D)
    • Code 621-Shift solenoid 1 circuit failure
    • Code 622-Shift solenoid 2 circuit failure
    • Code 624-EPC solenoid or driver circuit failure
    • Code 625-EPC driver open in PCM
    • Code 626-Coast clutch solenoid circuit failure (E40D)
    • Code 627-Converter clutch solenoid circuit failure (E40D)
    • Code 628-Converter clutch error (E40D)
    • Code 629-Converter clutch control circuit failure
    • Code 631-Overdrive cancel indicator light circuit failure
    • Code 632-Overdrive cancel switch not changing states (E40D)
    • Code 633-4WD switch is closed
    • Code 634-MLP sensor voltage out of self-test range, A/C on
    • Code 636-TOT sensor voltage out of self-test range
    • Code 637-TOT sensor circuit above maximum voltage
    • Code 638-TOT sensor circuit below minimum voltage
    • Code 654-MLP sensor not in park position
    • Code 998-Hard fault present

  • Todd Gale
    Todd Gale Sep 24, 2008

    Reverify your code faults


    • Code 11-System pass
    • Code 12-RPM unable to reach upper test limit
    • Code 13-RPM unable to reach lower test limit
    • Code 14-Pip circuit failure
    • Code 15-PCM read only memory test failed
    • Code 15-PCM keep alive memory test failed
    • Code 16-IDM signal not received
    • Code 18-SPOUT circuit open or spark angle word failure
    • Code 18-IDM circuit failure or SPOUT circuit grounded
    • Code 19-Failure in PCM internal voltage
    • Code 21-ECT out of self-test range
    • Code 22-BP sensor out of self-test range
    • Code 22-BP sensor or MAP out of range
    • Code 23-TP sensor out of self-test range
    • Code 24-ACT sensor out of self-test range
    • Code 25-Knock not sensed during dynamic test
    • Code 26-VAF/MAF out of self-test range
    • Code 26-TOT out of self-test range
    • Code 26-TOT sensor out of self-test range (E-400)
    • Code 28-Loss of IDM, right side
    • Code 29-Insufficient input from vehicle speed sensor
    • Code 31-PFE, EVP or EVR circuit below minimum voltage
    • Code 32-EVP voltage below closed limit
    • Code 33-EGR valve opening not detected
    • Code 34-EVP voltage above closed limit
    • Code 35-PFE or EVP circuit above closed limit
    • Code 41-HEGO sensor circuit indicates system lean
    • Code 41-No HEGO switching detected
    • Code 42-HEGO sensor circuit indicates system rich
    • Code 44-Thermactor air system inoperative-right side
    • Code 45-Thermactor air upstream during self-test
    • Code 45-Coil 1, 2 or 3 failure
    • Code 46-Thermactor air not bypassed during self-test
    • Code 47-4WD switch closed (E40D)
    • Code 48-Loss of IDM, left side
    • Code 49-1-2 shift error (E40D)
    • Code 51-ECT/ACT reads -40°F or circuit open
    • Code 52-Power steering pressure switch circuit open
    • Code 52-Power steering pressure switch always open or closed
    • Code 53-TP circuit above maximum voltage
    • Code 54-ACT sensor circuit open
    • Code 56-VAF or MAF circuit above maximum voltage
    • Code 56-TOT reads -40°F or circuit open (E40D)
    • Code 59-2-3 shift error (E40D)
    • Code 61-ECT reads 254°F or circuit grounded
    • Code 63-TP circuit below minimum voltage
    • Code 64-ACT sensor grounded or input reads 254°F
    • Code 65-Overdrive cancel switch open, no change seen (E40D)
    • Code 66-MAF sensor input below minimum voltage
    • Code 66-TOT grounded or reads 290°F (E40D)
    • Code 67-Neutral/drive switch open or A/C on
    • Code 67-Clutch switch circuit failure
    • Code 67-MLP sensor out of range or A/C on (E40D)
    • Code 69-3-4 shift error
    • Code 72-Insufficient MAF/MAP change during dynamic test
    • Code 73-Insufficient TP change during dynamic test
    • Code 74-Brake on/off switch failure or not actuated
    • Code 77-Operator error
    • Code 79-A/C on during self-test
    • Code 79-A/C or defrost on during self-test
    • Code 81-Air management 2 circuit failure
    • Code 82-Air management 1 circuit failure
    • Code 84-EGR vacuum solenoid circuit failure
    • Code 85-Canister purge solenoid circuit failure
    • Code 86-Shift solenoid circuit failure
    • Code 87-Fuel pump primary circuit failure
    • Code 88-Loss of dual plug input control
    • Code 89-Converter clutch solenoid circuit failure
    • Code 91-Shift solenoid 1 circuit failure (E40D)
    • Code 92-Shift solenoid 2 circuit failure (E40D)
    • Code 93-Coast clutch solenoid circuit failure (E40D)
    • Code 94-Converter clutch solenoid circuit failure (E40D)
    • Code 95-Fuel pump secondary circuit failure- PCM to ground
    • Code 96-Fuel pump secondary circuit failure-battery to PCM
    • Code 97-Overdrive cancel indicator light-circuit failure(E40D)
    • Code 98-Electronic pressure control driver open in PCM (E40D)
    • Code 98-Hard fault present
    • Code 99-Electronic pressure control circuit failure (E40D)
    • Code 111-System pass
    • Code 112-ACT sensor circuit grounded or reads 254° F
    • Code 113-ACT sensor circuit open or reads -40° F
    • Code 114-ACT outside test limits during KOEO or KOER tests
    • Code 116-ECT outside test limits during KOEO or KOER tests
    • Code 117-ECT sensor circuit grounded
    • Code 117-ECT sensor circuit below minimum voltage or reads 254°F
    • Code 118-ECT sensor circuit open
    • Code 118-ECT sensor circuit below maximum voltage or reads -40°F
    • Code 121-Closed throttle voltage higher or lower than expected
    • Code 122-TP sensor circuit below minimum voltage
    • Code 123-TP sensor circuit below maximum voltage
    • Code 126-BP or MAP sensor higher or lower than expected
    • Code 128-MAP vacuum circuit failure
    • Code 129-Insufficient MAF or MAP change during dynamic responded test
    • Code 144-No HEGO switching detected
    • Code 167-Insufficient TP change during dynamic response test
    • Code 171-Fuel system at adaptive limit, HEGO unable to switch
    • Code 172-HEGO shows system always lean
    • Code 173-HEGO shows system always rich
    • Code 174-HEGO switching time is slow
    • Code 179-Fuel at lean adaptive limit at part throttle; system rich
    • Code 181-Fuel at rich adaptive limit at part throttle; system lean
    • Code 182-Fuel at lean adaptive limit at idle; system rich
    • Code 183-Fuel at rich adaptive limit at idle; system lean
    • Code 211-PIP circuit fault
    • Code 212-Loss of IDM input to PCM or SPOUT circuit grounded
    • Code 213-Spout circuit open
    • Code 224-Erratic IDM input to processor
    • Code 225-Knocked not sensed during dynamic response test
    • Code 311-Thermactor air system inoperative
    • Code 312-Thermactor air upstream during self-test
    • Code 313-Thermactor air not bypassed during self-test
    • Code 327-EVP or DPFE circuit below minimum voltage
    • Code 328-EGR closed voltage higher than expected
    • Code 332-Insufficient EGR flow detected
    • Code 334-EGR closed voltage higher than expected
    • Code 337-EVP or DPFE circuit above maximum voltage
    • Code 411-Cannot control rpm during KOER low rpm check
    • Code 412-Cannot control rpm during KOER high rpm check
    • Code 452-Insufficient input from vehicle speed sensor
    • Code 511-EEC processor ROM test failed
    • Code 512-EEC processor Keep Alive Memory test failed
    • Code 513-Failure in EEC processor internal voltage
    • Code 519-Power steering pressure switch circuit open
    • Code 521-Power steering pressure switch did not change state
    • Code 525-Vehicle in gear or A/C on during self-test
    • Code 536-Brake on/off circuit failure, switch not actuated during KOER test
    • Code 538-Insufficient RPM change during KOER dynamic response test
    • Code 538-Operator error
    • Code 542-Fuel pump secondary circuit failure: PCM to ground
    • Code 543-Fuel pump secondary circuit failure: Battery to PCM
    • Code 552-Air management 1 circuit failure
    • Code 553-Air management 2 circuit failure
    • Code 556-Fuel pump primary circuit failure
    • Code 558-EGR vacuum regulator circuit failure
    • Code 565-Canister purge circuit failure
    • Code 569-Canister purge 2 circuit failure
    • Code 617-1-2 shift error (E40D)
    • Code 618-2-3 shift error (E40D)
    • Code 619-3-4 shift error (E40D)
    • Code 621-Shift solenoid 1 circuit failure
    • Code 622-Shift solenoid 2 circuit failure
    • Code 624-EPC solenoid or driver circuit failure
    • Code 625-EPC driver open in PCM
    • Code 626-Coast clutch solenoid circuit failure (E40D)
    • Code 627-Converter clutch solenoid circuit failure (E40D)
    • Code 628-Converter clutch error (E40D)
    • Code 629-Converter clutch control circuit failure
    • Code 631-Overdrive cancel indicator light circuit failure
    • Code 632-Overdrive cancel switch not changing states (E40D)
    • Code 633-4WD switch is closed
    • Code 634-MLP sensor voltage out of self-test range, A/C on
    • Code 636-TOT sensor voltage out of self-test range
    • Code 637-TOT sensor circuit above maximum voltage
    • Code 638-TOT sensor circuit below minimum voltage
    • Code 654-MLP sensor not in park position
    • Code 998-Hard fault present

  • Todd Gale
    Todd Gale Oct 02, 2008

    Codes do not disappear, they remain in history until the history is cleared and no, code readers read the computer and do not retain the information themselves, unless you download to the unit the history. The fact that you have Oxygen sensor code fault denotes that the code is a registered code and has been set into the computer as current. It will be moved to history after the code is no longer registering as a problem in the computer, I am not sure what keemo is trying to say, but it makes no sense and is not correct. The more expensive code readers cover more vehicles and handle a more extensive check on those cars. Such as Mercedes, BMW and other European cars.

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1 Answer

Check engine light is flashing and cruise quit working


DO NOT DRIVE IT.....Driving it when the check engine is flashing may cause a simple problem to become a major problem if not fixed right away. Cruise control will always disable when the check engine light is on, when cleared, it will work again. Blinking light means serious malfunction, needs to be repaired right away. This can be many things, from simple multiple cylinder misfire, to something more serious.

Jan 26, 2011 | 2005 Chevrolet Trailblazer Ext

5 Answers

My Service Engine Soon light came on about a year ago. I took it into the shop and got that problem fixed but the light stayed on, so I took it to advance auto parts and code tested it and it said that...


There are several types of O2 Sensor codes. There can be "Lean O2 Sensor" codes, "Rich O2 Sensor" codes, "O2 Sensor Slow Response" codes, or "O2sensor Heater Circuit" codes. The specific code that is being set changes the way you must go about diagnosing and repairing the problem. I will say however, that in about 80% of all the O2 Sensor code problems that I have had to diagnose, the O2 Sensor itself was NOT the problem. The O2 Sensor was only reporting a problem that was actually caused elsewhere. O2 Sensors are the final checkpoint in the engine management system. I think of them like a report card. If the O2 Sensors are right, the rest of the engine management system is right. If the O2 Sensors are not right, the rest of the engine management system is probably not right. (Except in the 20% of the cases where the problem is actually being caused by a failed O2 Sensor)

Dec 04, 2010 | Mitsubishi Galant Cars & Trucks

1 Answer

Engine light code 44 1994 GMC Sierra Pickup HD 5.7l, 4wd.


look for a serious exhaust or intake leak. look for bad wires to the o2 sensor or map sensor. just for starters.

Jul 20, 2010 | 1994 GMC Sierra

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