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P0155 EV in my code reader.

I have changed both 02 sensors and the gas cap. It went a couple of days before the code came back. Anybody got any suggestions?

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Could be a minor hole in your fillup tube..had a grand am thet had a pin hole in it,so small they couldnt find it with a smoke test..

Posted on Apr 16, 2014

  • ejm2984
    ejm2984 Apr 16, 2014

    Could be a minor hole in your fillup tube..had a grand am thet had a pin hole in it,so small they couldnt find it with a smoke test..

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1 Answer

1998 lexus gs300 code p0155


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P0155 error code Mitsubishi diamante 2002 where is it located the sensor


P0155 is not telling you which part is defective, it is saying there is a problem in the system and that the triggers the fault code. In this case you have a O2 sensor whose heater is not heating. This may be the senor or the wiring to it.
P0155 OBD-II Trouble Code: 02 Sensor Heater Circuit Malfunction in cylinder Bank 2 (V6 only), Sensor 1, this is the sensor before the catalyst.

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I have an 04 cavalier. Code P0172 mechanic changed upstream 02 senor. light came back on. Brought back to mechanic he changed the downstream, light came back on. I changed fuel filter, spark plugs, oil...


Think your guy changed O2 Sensors ,
but didn't consider that your sensors PO172
is rich,because it is correcting for a lean condition


I'am going to really guess here

The EVAP has leaks,but no codes set,
partially driving the system lean (Vacuum Leaks)

The Converter is sort of out there as
not working well either

I would smoke the EVAP System and everything else,
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I think you will find this by MAYBE even just looking
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Is that data from your mechanics scanner ?
What is their theory ?

Bank 1 has a vacuum leak I think !! ??

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Scan with code reader P0440 EVAC SYSTEM MALFUNCTION. It also informed me that my O2 sensor, EGR valve and catalst was not reading. I would like to do the repairs my self. would a faulty O2 sensor cause...


p0440 is a failure in the evaporative system, could be a hole in lines or a bad gas cap. screw cap on tighter to see if this may be your problem. the vent in the cap may not be letting pressure out, so loosen it to see. 02 sensor is a different code. have vehicle scanned to find codes. 02 sensor, egr, are part of the emission system etc. have a good day!!

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P0155 is an O2 sensor heater fault. Could be the wiring to the sensor, could be internal to the sensor. Good explanation here (I see you have been there too!)
http://www.obd-codes.com/p0155

Use a Volt/Ohm meter to check the wiring harness. If those check out okay then replace the sensor.

Replacing an O2 sensor doesn't take long if you can access it. Sometimes there's not much space to work.

As for the cold weather... the cold weather has probably just uncovered an issue with the heater that *might* go away when it warms up. However it will take a while for the CEL to go off.

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Ive got a question for a 1997 chevy tahoe. i need to find out which o2 sensor to change when a DTC codes register with P0155 AND P0154. can anybody help me?


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THIS IS THE SENSOR BEFORE THE CAT CONVERTER
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Check engine light on code is P0155-02


I had to replace both o2 sensors on my 2002 Tundra after about 50K. Toyota recalled this problem afterwards and refunded my money. My solution to you is to not worry about which one is bad and go ahead and replace both, because I had one bad and before I could replace it the other went bad also. PS: You'll have to purchase a special socket to remove them and unless you pruchase the Toyota product ( I used O'Reilly parts), you have to cut and splice the wires with a waterproof splicing kit included with the sensors. Just follow the instructions, not a hard job.

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