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Dave Lieberman Posted on Mar 03, 2019
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2004 cadillac deville P0155 o2 heater circuit malfunction (Bank 2 Sensor 1)

I replaced the O2 sensor, but "chk engine" light continues to show up. New readout shows above

  • Arnie Burke
    Arnie Burke Mar 17, 2019

    Cud b bad connection or sensor is toast

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1 Answer

Derrick Schultz

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  • Cadillac Master 11,405 Answers
  • Posted on Mar 16, 2019
Derrick Schultz
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I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manuals

2 Related Answers

Anonymous

  • 6982 Answers
  • Posted on Mar 16, 2009

SOURCE: P0155 & P0135

O2 sensors are tricky. sometimes like anything else they fail. many times though the exhaust mixture they encounter is out of their range and that shows up as a failure.since you seem to have no other problems , I would go ahead and change them, but don't be disappointed if the code shows up again (at least you know it's not the sensors.) I don't like using the process of elimination when doing repairs but sometimes you must.

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Anonymous

  • 659 Answers
  • Posted on Mar 01, 2009

SOURCE: more 99 cougar problems

there is a fuse for the o2 heaters if one of the sensors blew the fuse they will all be out

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Related Questions:

0helpful
1answer

My jeepliberty will crank but not fire. error code 135 BANK 1 AND 155 BANK 2?

If they are codes P0135 and P0155 they refer to both O2 sensors nearest the engine on the exhaust. The ones before the catalytic converter on each exhaust pipe.
P0135 = O2 Sensor Heater Circuit Bank 1 Sensor 1
P0155 = O2 Sensor Heater Circuit Bank 2 Sensor 1
2helpful
2answers

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
1helpful
4answers

What does code p0155 mean

P0155 = 2/1 O2 Sensor Heater Failure, Oxygen sensor heater element malfunction. logic dictates that you replace your O2 Sensor. DIY car obd2 code scanner online shopping
0helpful
1answer

Why the codes po125 & po135 &po155 keep coming back?

Hi there:

DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control

The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level).


DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
or
DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

A code P0135 and P0155 may mean that one or more of the following has happened:

  • O2 Heater element resistance is high
  • Internal short or open in the heater element
  • O2 heater circuit wiring high resistance
  • open or short to ground in the wiring harness

In order to solve just...
  • Repair short or open or high resistance in wiring harness or harness connectors
  • Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)


  • Hopoe this helps.
    0helpful
    1answer

    I'm thinking about buying a 2002 range rover. It has a service/check engine codes of 134,135,155. Is it likely to be more than oxygen sensor problems? Please reply , Mel

    with those codes showing, it could be either bad O2 sensors or there is a problem with the wiring to those sensors. Also, the wrong sensors may be installed. I'm assuming codes P0134, P0135, P0155.

    For others viewing this:

    P0134 = O2 sensor circuit-no activity detected (bank 1 sensor 1)

    P0135 = O2 sensor heater circuit malfunction (bank 1 sensor 1)

    P0155 = O2 sensor heater circuit malfunction (bank 2 sensor 1)
    5helpful
    1answer

    2002 blazer zr2 check engine light code is po155 bank 2 sensor 2 where is it and how do I check it

    P0155 is o2 sensor heater circuit malfunction bank 2 sensor 1 it is the o2 sensor circuit in front of the cat converter the o2 sensors are located mounted to the exhaust pipe in front and behind the catylic converter the problem is in the circuit [wiring or sensor itself] check wiring and repair if necessary if the short or open circuit is the sensor need to replace sensor +++ P0161 is 02 sensor heater circuit malfunction BANK 2 SENSOR 2 ++++++ this is the sensor behind the cat converter
    0helpful
    1answer

    P0155 & P0135

    O2 sensors are tricky. sometimes like anything else they fail. many times though the exhaust mixture they encounter is out of their range and that shows up as a failure.since you seem to have no other problems , I would go ahead and change them, but don't be disappointed if the code shows up again (at least you know it's not the sensors.) I don't like using the process of elimination when doing repairs but sometimes you must.
    1helpful
    1answer

    More 99 cougar problems

    there is a fuse for the o2 heaters if one of the sensors blew the fuse they will all be out
    1helpful
    2answers

    P0155?

    P0155 OBDII code refers to HO2S heater circuit - bank 2 sensor 1 , not knowing your engine size and engine vin code thats about as far as we can go with our answer . we can say bank 2 sensor 1 is the passenger side upstream oxygen sensor has a heater circuit problem , could possibly be a bad oxygen sensor . you ask what is that - thats what it is ... cheers .
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