Question about 1992 Saturn SL1

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Automotive repair 1992 saturn runs rich and throws dtc 45 and 26 but changed o2 sensor and purge selnoid allready pcm is good and code is hard and will not erase even for a second any ideas?

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The ECT (Engine Coolant Temp) sensor is most likely bad. Common problem with Saturns.

Posted on May 21, 2008


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97 Cadillac deville all four 02s keep coming back after repairs was made P0135, 0138, 0141, 0155,or could it be the coil packs

all of those codes listed have a common fault listed and that is the ECM
substitute it with a known good unit and then see what happens

Sep 05, 2016 | 1997 Cadillac DeVille

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2004 Chevrolet Colorado 2.8L I4 P1133 NIGHTMARE.. Changed Front o2 sensor code still comes back, Help? Autel Scanner Shows EVAP and Cat monitors with X with P1133 DTC and pending

DTC P1133
The PCM detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts is less than a calibrated value.
Test the HO2S 1 high signal circuit for a short to the HO2S 1 low signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 14
Go to Step 11


Test the HO2S 1 high signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Test for shorted terminals and for poor connections at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems

Jul 12, 2015 | Chevrolet Cars & Trucks

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Two codes 1 po172 bank 1 running rich / 2 po300 missfire where to start ?

You could have leaking fuel injectors an fouled spark plugs causing the misfire ! I would pull the spark plugs out an see if wet with fuel . Could also have a leaking fuel pressure regulator ! How To Fix P0300 random misfire codes in your car

O2 Sensor Signal Fixed Rich
The front oxygen sensor sends signals on exhaust gas oxygen content to the PCM to control a 14.7:1 air/fuel ratio under normal driving conditions. The PCM can make fuel corrections from a nominal 128 (0% correction) short/long term fuel trim value to a maximum window of 101-147 (-21 to +15 percent). If the PCM determines a rich condition exists, 02 voltage above 450 mV, it will decrease injector pulse width, reducing fuel, to maintain a 14.7:1 air/fuel ratio. The short term fuel trim value will be between 101-128 indicating a rich condition. If the PCM determines a lean condition exists, 02 voltage below 450 mV, it will increase injector pulse width, adding fuel, maintaining a correct air/fuel mixture. The short term fuel trim value will be between 128-147 indicating a lean condition. When certain conditions have been met to begin learning fuel control (ECT, closed loop, etc.) the PCM will use the short term fuel trim cell to update 1 of the 4 long term cells (idle, decel, cruise, accel) being used. During every drive cycle, or trip, the PCM will use and update the idle and cruise long term cells and will keep track of how long the control system is operating in these cells. After approximately 2 minutes of being in each of these cells, the fuel control system will enable EVAP purge and the purge long term cells will be used. Refer to EVAP Canister Purge for information on purge long term fuel cells. If the average of the idle and cruise fuel cells is 147 and the short term fuel trim cell is currently over 128, a lean fuel system DTC will set. This test is performed before the purge cells are used.

Feb 07, 2015 | 1996 Saturn SL

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Error codes po152 and po442

Hi there:
DTC P0152 - 02 Sensor Circuit High Voltage (Bank 2 Sensor 1)
The o2 (oxygen) sensors basically measure oxygen content in the exhaust. The PCM (powertrain control module) then uses this information to regulate fuel injector pulse. The o2 sensors are very important to proper operation of the engine. Problems with them can cause the PCM to add or take away too much fuel based on the faulty o2 sensor voltage.

A P0152 code refers to the Bank 2, sensor 1, o2 sensor. (Bank 1 would contain cylinder 1 and bank 2 is the opposite bank. Bank 2 doesn't necessarily contain cylinder 2.) "Bank 2" refers to the side of the exhaust that DOES NOT contain cylinder number 1 and "Sensor 1" indicates that it is the pre-cat sensor, or forward(first) sensor on that bank. It is a four wire sensor. The PCM supplies a ground circuit and a reference voltage of about .5 volts on another circuit. Also for the o2 heater there is a battery voltage supply wire and another ground circuit for that. The o2 sensor heater allows the o2 sensor to warm up faster, thus achieving closed loop in less time than it would normally take for the exhaust to warm the sensor up to operating temperature.
The O2 sensor varies the supplied reference voltage based on oxygen content in the exhaust. It is capable of varying from .1 to .9 volts, .1 indicating lean exhaust and .9 indicating rich exhaust. NOTE: A condensed explanation of fuel trims: If the o2 sensor indicates that the oxygen voltage reading is .9 volts or high, the PCM interprets this as a rich condition in the exhaust and as a result decreases the amount of fuel entering the engine by shortening injector "on time". The STFT (short term fuel trims) would reflect this change. The opposite would occur when the PCM sees a lean condition. The PCM would add fuel which would be indicated by a single digit positive STFT reading. On a normal engine the front o2 sensors switch rapidly back and forth two or three times per second and the STFT would shift positive and negative single digits to add and remove fuel to compensate at a similar rate. This little "dance" goes on to keep the air/fuel ratio at it's optimal level. Short term fuel trims or STFT reflect immediate changes in fuel injector "on-time" while long term fuel trims or LTFT reflect changes in fuel over a longer period of time. If your STFT or LTFT readings are in the positive double digits (ten or above), this indicates the fuel system has been adding an abnormal amount of fuel than is necessary to keep the proper air/fuel ratio. It may be overcompentsating for a vacuum leak or a stuck lean o2 sensor, etc. The opposite would be true if the fuel trim readings are in the negative double digits. It would indicate that the fuel system has been taking away excessive amounts of fuel, perhaps to compensate for leaking injectors or a stuck rich o2 sensor, etc. So when experiencing o2 related issues, reading your fuel trims can indicate what the PCM has been doing over the long term and short term with regard to fuel.
This code indicates that the o2 sensor was stuck too high or in the rich position. The PCM monitors this voltage and if it determines that the voltage is too high out of range for too long, P0152 may set.

Symptoms may include:MIL (Malfunction Indicator Lamp) illuminationEngine may run very roughEngine may be running lean or rich depending on if the o2 sensor is reading correctly or incorrectlyLack of powerIncreased fuel consumption

Potential causes of an P0152 code include:Bad bank 2, 1 o2 sensor incorrectly reading rich conditionEngine running rich and o2 sensorCorrectly reading rich conditionSignal shorted to voltage in harnessWiring harness damage/melted due to contact with exhaust componentsVacuum leak (make have lean codes (P0171, P0174) present with it)Leaking injectorsBad fuel pressure regulatorBad PCM

Possible Solutions:If you have any lean or rich codes associated with this code, focus on fixing these first because these can cause the o2 sensor voltage readings to appear to be faulty when they are in fact only reading correctly.
So, with the engine running at operating temperature, use a scan tool to observe the Bank 2,1 o2 sensor voltage reading. Is it high? If so, look at the long term and short term fuel trim readings. The fuel trims are affected by the o2 sensors as noted above. If the LTFT reading for that bank is indicating negative double digits (PCM trying to take away fuel to compensate for problem) try inducing a vacuum leak to see if the sensor voltage then goes lean and the fuel trims increase. If the o2 sensor responds, suspect a problem with the engine, not the sensor. There may be other engine codes to help you.
If the o2 sensor reading remains high (0.9 volts or above) and won't respond then shut off engine. With KOEO (Key on engine off) disconnect the o2 sensor and look for signs of corrosion or water intrustion. Repair as necessary. The voltage reading should now be about 0.5 volts. If so, replace the o2 sensor, it's shorted internally.
If after unplugging the o2 sensor the voltage reading on the scan tool doesn't change, then suspect wiring problems. Inspect the harness and look for any melted wires or anywhere that the o2 sensor harness is making contact with the exhaust components. If you are unsure, you can check for continuity of all four wires between the sensor and the PCM with an ohmmeter. Any resistance at all indicates a problem. Repair as necessary.

DTC P0442 - Evaporative Emission Control System Leak Detected (small leak)
This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

A code P0442 most likely means one or more of the following has happened:A loose or improperly affixed gas capA non-conforming gas cap (i.e. not factory/original brand)A small leak/hole in a fuel vapor hose/tubeOther small leak in EVAP systemFaulty vent o-ring seal

With a P0442, the most common repair is to:Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.Otherwise, replace the gas cap, orInspect the EVAP system for cuts/holes in tubes/hoses

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Mar 28, 2012 | 2001 Jeep Grand Cherokee

1 Answer

I got a P0601 DTC on my 2001 Chrysler Voyager 2.4. I replaced the PCM and immediately got a P0172 with a rough idle. I replaced the O2 sensors but still have the same problem with same DTCs.

OK. Let's see here...with the code P0601 you had no choice but to replace the PCM. Now here is the kicker...Was it properly programmed before you started the engine up? I just have to ask because I have seen things like this happen with PCM replacements when the PCM did not get programmed properly or when people switch out used PCM's from other vehicles that are not programmed with the correct software for the vehicle it is going into.

Now, with all that said:
The O2 sensors are RARELY - IF EVER the cause of this code. It does not surprise me that replacing the O2 sensors did not fix it.

Either the O2 sensor signal circuit is shorted to voltage, or you have something wrong with your engine that is causing the engine to run extremely rich. Any way you look at it, your O2 sensor signal voltage is way too high. This is why O2 sensor failures do not usually cause this code. When O2 sensors fail, they do not produce voltage like they should and you will get LEAN codes, not RICH codes.

Anyway, this code is more likely to be caused by a bad engine coolant temperature sensor (ECT), a bad manifold absolute pressure sensor (MAP), a leaking fuel pressure regulator diaphragm, leaking injectors, etc. or something could be shorting out the reference voltage to the MAP sensor and the Throttle Position Sensor.

Please also review this article:

What Else Could Be Wrong?

Sep 20, 2011 | Chrysler Voyager Cars & Trucks

1 Answer

For a 2000 Saturn SL2 DOHC I am getting a C0133 ODB Code. It is for the O2 Sensor but which one? The upper at the exhaust manifold or the lower for the catalytic converter.

how about a PO133 ,,,should be the first in system
The Oxygen Sensor 1 (O2S-1) is an electrical source that responds to oxygen content in the exhaust manifold. When the sensor reaches approximately 316°C (600°F), it produces a voltage based on the difference in oxygen between the atmosphere and exhaust gas. The PCM sends a bias voltage (391-491 mV) on the signal line which is pulled up through high resistance. When the O2S-1 is cold, it produces no voltage and has extremely high internal resistance. The internal resistance of the sensor is much greater than the resistance of the bias pull-up resistor. However, when the sensor heats up, it produces voltage that overrides the bias voltage. This voltage is read by the PCM to determine a rich/lean O2S-1 signal used to adjust injector pulse width. Under normal conditions, low sensor voltage means high oxygen content/lean air-fuel mixture and vice versa. Normal sensor readings will fluctuate between 10 mV and 999 mV DTC P0133 sets when the O2S-1 signal rich to lean or lean to rich average response time is too slow.

DTC P0133 will set if the average response time of the LEAN to RICH switches is greater than 125 ms or the average response time of the RICH to LEAN switches is greater than 156 ms for 100 seconds when:
^ Engine speed is between 1500 and 3200 RPM
^ Loop status is closed
^ Calculated air flow is greater than 7 gm/s
^ Commanded air/fuel ratio is 14.7 to 1
^ No cam, CKP, ECT, EGR, EVAP purge solenoid, fuel trim, IAT, MAP misfire, system voltage or TP sensor DTCs have been set.

DTC P0133 diagnostic runs continuously once the once the above conditions have been met.

DTC P0133 is a type B DTC.

Possible causes of DTC P0133:
^ An intermittent connection or corrosion in the O2S-1 harness connector can set this DTC. Use Scan tool to monitor O2S-1 voltage with engine running at normal operating temperature while wiggling the signal and ground wire. Make sure the sensor is tight.
^ The most probable cause for DTC P0133 is contamination. Check for obvious contamination (oil, fuel or engine coolant) by removing sensor. Identify and correct the cause of the contamination if contaminated. Replace the O2S-1.
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Jun 03, 2011 | Saturn SL2 Cars & Trucks

2 Answers

What is po133 code on 1997 sc2 saturn

DTC P0133Circuit Description

After achieving closed loop fuel control, a commanded air fuel ratio of 14.7:1, RPM between 1,500-3,200, and air flow between 7-25 grams per second, the PCM will continuously monitor the front oxygen sensor signal for 100 seconds. During this time, the PCM counts the number of rich to lean and lean to rich switches. To be considered a switch, the voltage must go below 300 mv and above 600 mv. The PCM also keeps track of the time it takes to make the switch. The number of switches along with the time to achieve these switches are used to calculate the average response time to perform each switch. Also this information is used to calculate if the proper ratio of the switches is correct. The 3 diagnostic trouble codes listed below are used to identify different types of faults that can occur with oxygen sensors.

Conditions for Setting the DTC

DTC P0133
This DTC is set if the average response time of the switches from the sensor is too slow after the 100 second test is performed. If the lean to rich time is greater than 125 ms or the rich to lean time is greater than 156 ms, this code will set.

Diagnostic Aids
Repair Procedure
The oxygen sensor wiring and connections should be checked if any of these DTCs are set because corrosion or loose connections could cause these DTCs to set.
The most likely cause of setting any of these DTCs is contamination. This contamination could be caused by fuel, improper use of RTV sealant, engine oil, or coolant contamination.
The source of contamination should be identified and corrected before replacing the sensor.

You may have poor plug wires, or even a low compression cylinder. Also, make sure the air filter is clean. Your oxygen sensor (upstream) the one closest to the engine has detected a rich condition.

Mar 29, 2011 | Saturn SC2 Cars & Trucks

1 Answer

I need my car to pass emissions. It's a 1992 saturn stick shift. Last time I ran it through they said the carbon monoxide was to high. What do I need to do?

CO --is a rich condition

Need a clean air filter
Good Spark plugs
Clean oil,preferably synthetic
O2 Sensors that work correctly
PCV that works well
No vacuum leaks

I DID NOT SAY throw parts at it

I offered ideas on a rich condition

Dec 18, 2010 | 1992 Saturn SL2

1 Answer

What is code p1133

Circuit Description
The powertrain control module (PCM)/engine control module (ECM) constantly monitors the oxygen sensor (O2S 1) activity for 100 seconds . During the monitor period, the PCM/ECM counts the number of times that the O2S 1 switches from rich to lean and from lean to rich. With this information, a total for all switches can be determined. If the number of switches is too low, DTC P1133 will set. The lean-to-rich and the rich-to-lean are greater than 18 switches.

Conditions for Setting the DTC
  • DTCs P0106, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0134, P0171, P0172, P0201, P0202, P0203, P0204, P0300, P0336, P0337, P0351, P0352, P0402, P0404, P0405, P0406, P0443, P0506, P0507, P1130, P1404 and P1627 not set.
  • Engine is operating in closed loop.
  • Purge D.C. is greater than 0%
  • Engine coolant temperature (ECT) is above 72 °C (162 °F) .
  • The engine has been operating for at least 120 seconds .
  • Calculated airflow is between 9 and 42 grams/sec .
  • Canister purge duty cycle is greater than 2%.
  • Engine speed is between 1600 rpm and 4000 rpm .
  • 0 second delay after conditions are met.
  • Airflow is between 7 and 40 g/sec .
Action Taken When the DTC Sets
  • The PCM/ECM will illuminate the malfunction indicator lamp (MIL).
  • Open loop fuel control will be in effect.
  • The PCM/ECM will store conditions which were present when the DTC was set as Freeze Frame and in the Failure Records data.
  • A history DTC is stored.
  • Coolant fan turns on.
Conditions for Clearing the MIL/DTC
  • The PCM/ECM will turn the MIL off on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
  • A history DTC P1134 will clear after 80 consecutive warm-up cycles have occurred without a fault.
  • DTC P1133 can be cleared by using the scan tool CLEAR INFO function or by disconnecting the PCM/ECM battery feed.
Diagnostic Aids
DTC P1133 is most likely caused by one of the following items:
  • Fuel Pressure - The system will go rich if the fuel pressure is too high. The PCM/ECM can compensate for some increase. However, if it gets too high, a DTC P1133 may set. Refer to "Fuel System Diagnosis".
  • Leaking injector - A leaking or malfunctioning injector can cause the system to go rich.
  • Manifold Absolute Pressure (MAP) sensor - An output that causes the PCM/ECM to sense a higher than normal manifold pressure (low vacuum) can cause the system to go rich. Disconnecting the MAP sensor will allow the PCM/ECM to set a fixed value for the MAP sensor. Substitute a different MAP sensor if the rich condition is gone while the sensor is disconnected.
  • Pressure regulator - Check for a leaking fuel pressure regulator diaphragm by checking for the presence of liquid fuel in the vacuum line to the pressure regulator.
  • Throttle Position (TP) sensor - An intermittent TP sensor output can cause the system to go rich due to a false indication of the engine accelerating.
  • O2S 1 contamination - Inspect O2S 1 for silicone contamination from fuel or improper use of RTV sealant. The sensor may have a white powdery coating and result in a high but false voltage signal (rich exhaust indication). The PCM/ECM will then reduce the amount of fuel delivered to the engine causing a severe surge or driveability problem.

Dec 03, 2010 | 1999 Daewoo Nubira

1 Answer

Trouble codes

Trouble Code: P0139
O2 (B1 S2) Slow Response
Trouble Code Conditions:Engine started; vehicle driven at 20-55 mph with the throttle open for 2 minutes; ECT at more than 158ºF (70C); catalytic converter temperature is more than 1112F (600C); and EVAP purge is active. O2 Sensor signal voltage switches less than 16 times from lean to rich within 20 seconds during monitoring, or will compare the state of change between the front and rear O2 Sensors and if the differences are greater than a calibrated amount, the DTC will set. 3 good trips are required to turn off the MIL.
Possible Causes:
  • Exhaust leak
  • O2 element is contaminated, deteriorated or it has failed
  • O2 signal circuit or return circuit has failed

Trouble Code: P0344
Camshaft Position Sensor Circuit Intermittent
Trouble Code Conditions:Engine cranking or running; system voltage over 10.5v. The PCM detected an intermittent loss of the CMP Sensor signal during the period of 2.5 complete engine revolutions. The failure counter must reach 20 before this code matures and a code is set.
Possible Causes:
  • Wiring harness fault
  • 5v supply circuit open or shorted to ground
  • Tone wheel/pulse ring is damaged or corroded
  • CMP Sensor has failed
  • CMP Sensor signal circuit is open, shorted to ground or battery voltage or 5v supply
  • CMP Sensor ground circuit is open
  • PCM has failed
  • Trouble Code: P0340
    No Camshaft Position Sensor Circuit Failure
    Trouble Code Conditions:Engine cranking or running, system voltage over 10v. The PCM detected CKP pulses without detecting any CMP Sensor pulses for 5 seconds or 2.5 engine revolutions.
    Possible Causes:
  • CMP Sensor connector is damaged, open or it is shorted
  • CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5v supply circuit
  • CMP Sensor 5v supply circuit is open or shorted to ground or to battery voltage
  • CMP Sensor ground circuit is open
  • CMP Sensor is damaged or has failed
  • CKP Sensor is damaged or has failed
  • PCM has failed
Good luck....

Nov 05, 2008 | 2005 Chrysler PT Cruiser

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