Question about 2000 Alfa Romeo 156

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How to do a OBD reset of error codes after replacing faulty O2 Probe on front part of exhaust.

I want to reset error codes on OBD / ECU of my 156 after I replaced O2 probe. Does someone have a way to do this without any OBD tools. I read something about disconnecting battery but this resets the ECU but not the Error codes Plz advice

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You should be able to reset the codes by unplugging the battery for a full minute. Make sure to remove both sides, Starting with the negative side (black), then the positive side (red) It resets the ecu, which sets it back to default, erases the memory/ codes. After one minute time has passed reinstall the battery terminals starting with the positive(red) side first then the negative (black). If you start the car and the code remains then you may have installed a faulty part, rare, but it does happen (quality control isn't all that great in china). Recheck to make the same code is being thrown, because you may have another issue going on.

Posted on Apr 17, 2014

  • Marco Schoolenberg
    Marco Schoolenberg Apr 17, 2014

    Ok I will give it a try. I might have actually swapped the wrong one of the 2 infront the CAT converter. I have OBD bluetooth port on the way.

  • Marco Schoolenberg
    Marco Schoolenberg Apr 17, 2014

    Tnx for the help

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Posted on Jan 02, 2017

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ginko
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SOURCE: have an error code that

Hi.

04433 code does not exist, check if the code is corresponding to one of the numbers listed below.

P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)

Test O2 sensor and replace O2 sensor or Cat converter.

P0443 EVAP Emission Control System Purge Valve Circuit- Electrical Fault in Circuit

Replace the purge valve or repair wiring. Check also fuel tank cap and ensure you did not overfill.

Posted on Sep 02, 2010

  • 1 Answer

SOURCE: How do you reset alfa romeo 156 2.0 t-spark radio

I just bought a '99 156 & had the same problem. As long as you have the 4 digit code then all you have to do is drive around for an hour (time the 60 mins!!) & providing you have switched the stereo "on" at the beginning the " - - - - " will appear on the front at 60mins. Then just type in the digits! The Alfa has this "anti theft" device on the stereo which also means every time the battery is disconnected you have to drive around for an hour before you do it again!

Posted on Feb 25, 2010

Testimonial: "Thanks . just as you say ,ive fixed the problem"

97F350diesel
  • 1326 Answers

SOURCE: replaced cylinder head gasket on alfa romero 156

You may have a cracked head or possibly cracked block as well. Did you have the head pressure tested when you pulled it off? All of those will allow coolant to seep into the compustion chamber.

Posted on Nov 11, 2009

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I need to know the code dtc44 for a 1990 Buick Century


GM OBD Trouble Code 44

Auto Systems and Repair

Oxygen Sensor Error (Lean Condition Indicated) The ECM receives a signal from the O2 sensor based on the amount of oxygen in the exhaust. If there is excess oxygen in the exhaust, it is in lean condition and the O2 sensor voltage will be low. The ECM uses this information to adjust the amount of fuel delivered to each cylinder.
Fault Code Description
  • 44 - Oxygen sensor error (lean condition indicated)
  • On V-type engines with two O2 sensors, code 44 would indicate the left bank sensor is lean
Symptoms
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Common Problems
  • Faulty O2 sensor
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Possible causes
- Warm Up Three Way Catalytic converter deterioration or malfunction
- Exhaust system leaks
- Loose front or rear HO2Ss
- Faulty front heater O2 sensor
- O2 sensors harness is open or shorted
- O2 sensors poor electrical connection
Tech notes
As the code description implies the P0422 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0422 code is combined with other codes, try fixing the other codes first.

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What is the codepo135


PO135 is an (O2) Oxygen Sensor Fault (http://www.obd-codes.com/p0135)

PO153 is an (O2) Oxygen Sensor Fault (http://www.obd-codes.com/p0153)

PO174 is "Too Much (O2) Oxygen in Exhaust" (http://www.obd-codes.com/p0174)

PO300 is "Random / Multiple Misfire" (http://www.obd-codes.com/p0300)

It would seem these are all related to one or more spark plugs NOT firing. Since it isn't firing, Oxygen (O2) is being detected in the exhaust - when Carbon Monoxide (CO) is expected. Other sources of high O2 can be cracked manifold, exhaust pipes, etc. Good luck!

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C1201 error code means that you have some problem in engine control system.

Possible causes for P0421 error
  • Warm Up Three Way Catalytic converter deterioration or malfunction
  • Exhaust system leaks
  • Loose front or rear HO2Ss
  • Faulty front heater O2 sensor
  • O2 sensors harness is open or shorted
  • O2 sensors poor electrical connection

The P0421 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem.

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02 sensor circuit low voltage ---answer is copied from obd-codes .com you can visit this site for more information if necessary Usually rear o2 sensor problems won't cause drivability issues since they are an input that measures catalyst efficiency (unlike front o2 sensors). However if you have other codes present, like lean codes or pre-o2 sensor codes, then they may cause drivability problems as well as P0143. The following symptoms may be present: MIL (Malfunction Indicator Lamp) illumination Engine performance issues Engine running rough Engine running rich (only if PCM is trying to add fuel to compensate for low o2 sensor voltage reading) Engine running lean (only if vacuum leak is large enough that PCM can't compensate by adding fuel) Poor idle Causes If you have reason to believe that your engine is running lean, fix that problem first, then clear codes and see if the P0157 code resets. An engine that is running lean could set this code, but usually there will be lean codes (P0171, P0174) present. The following could be causes: Air leaks in exhaust in front of o2 sensor giving false reading Engine running excessively lean O2 sensor connector damaged/corroded O2 sensor signal circuit is shorted to ground O2 sensor ground circuit is open O2 sensor has failed (it may be contaminated with fuel or coolant) PCM has failed

Read more at: http://www.obd-codes.com/p0157
Copyright © OBD-Codes.com

Oct 02, 2013 | 2001 GMC Jimmy

1 Answer

O2 SENSOR


Did you reset the codes after replacing the O2 sensor? It is possible sometimes that the values stored in the ECU for the earlier sensor may be giving the wrong readings. Try resetting the codes and see if it helps. Also, make sure that you replaced the part that was actually needed. If the OBD gives other codes, the problem might not be with the sensor.

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- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
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- Inappropriate fuel pressure
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P0132 - O2 Sensor Circuit High Voltage Bank 1 Sensor 1
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- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Front Heated Oxygen Sensor Bank 1
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