Question about 2004 Jeep Grand Cherokee

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Dtc codes p0155 & p0051

I replaced the o2 sensor [ bank 2 sensor 1 ]but these codes still keep coming up. Is there a fuse for the o2 sensor?

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  • Anonymous Mar 21, 2014

    replaced both O2 sensors and still throwing 185 and 188 engine codes

  • Anonymous Mar 21, 2014

    replaces both O2 sensor and code still pops up

  • Anonymous Mar 23, 2014

    location of 02 sensor Bank 1 Sensor 2

  • Anonymous Mar 26, 2014

    o2 sensor replacement

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I had the same problem and found out I was sold the wrong sensor, my 4.0 has four, they are all different, when you install a new sensor, you must make sure you clear the trouble code before you start the engine, ignition on engine off, that should do it, it worked for me, also if you have your own scanner and can erase the codes yourself, the wrong 02 sensor will turn engine light on with cold start, then after I erased the code it would stay off all day until the next cold start, thats when I found out my new 02 sensor was for bank 1 sensor 2, and not bank 2 sensor 1, hope this helps

Posted on Jan 19, 2009

  • shelley staffig Aug 05, 2013

    On the receipt he wrote replaced bank sencer 1&2 O2 sensor.I have disconnected the battery, that worked for a few miles then it came right back on. Now the engine light and seat belt light are both on. Does that mean the seat belt sensor is bad no too??

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There are fuses for oxygen sensor heaters. Check for 12 volts to the sensor with key on.

Posted on Oct 16, 2008

  • shelley staffig Aug 05, 2013

    Ok, never knew about those fuses. Can Autozone check that for me or do I have to take it in because I know nothing about car fuses

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What does code p0155 mean


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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
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    Aug 28, 2012 | 1999 Toyota Sienna

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    Error code p0155 on ford windstar 2002


    Hi there:DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
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    • 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

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    Use this link on previous answer to check diagra location.


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    This O2 sensor #1 may also be refered to as an air/fuel ratio sensor since on some vehicles it is. It detects the amount of oxygen in the exhaust gas compared to the outside air and then vehicle's computer adjusts the air/fuel ratio going into the engine. The sensor is less effective when the exhaust gas temperature is low, so it includes a heater which is activated to help get better readings from the A/F O2 sensor. Essentially this P0051 code means that the resistance of the heater circuit is lower than normal. In most cases, that resistance level must fall below 0.8 A to trigger the DTC code.

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    Causes A P0051 DTC trouble code may be caused by one or more of the following:
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    • Failed PCM/ECM
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    • check for 12 volts at the heater circuit feed (hint: unplug the sensor and check at the wiring connector to do this measurement)
    • check the ground circuit for continuity
    • measure the resistance of the heater circuit (done on the sensor itself)
    • measure the resistance and voltage of the wiring
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    With that said, a common fix for this DTC is to replace the air/fuel (O2 oxygen) sensor #1 on bank
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    Please keep in mind that OEM (original equipment) replacement sensors are recommended (from the dealer). Aftermarket sensors can be less reliable and of poorer quality (not always, but more often). There's also a chance that replacement parts for the P0051 code may also fall under a federal emissions warranty (check with your dealer to see if it's covered).

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    What is the meaning of code 51?


    A P0051 DTC (diagnostic trouble code) refers to the O2 sensor (oxygen sensor) located on Bank 2 in front of the catalytic converter. There is also an oxygen sensor behind the converter which is Sensor #2.

    This O2 sensor #1 may also be refered to as an air/fuel ratio sensor since on some vehicles it is. It detects the amount of oxygen in the exhaust gas compared to the outside air and then vehicle's computer adjusts the air/fuel ratio going into the engine. The sensor is less effective when the exhaust gas temperature is low, so it includes a heater which is activated to help get better readings from the A/F O2 sensor. Essentially this P0051 code means that the resistance of the heater circuit is lower than normal. In most cases, that resistance level must fall below 0.8 A to trigger the DTC code.

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    More 99 cougar problems


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