E46 318 CI - Fault Codes P0141, P0170 and P0136

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Thread: E46 318 CI - Fault Codes P0141, P0170 and P0136

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  1. E46 318 CI - Fault Codes P0141, P0170 and P0136 
    #1
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    stocky2's Car Details
    Model of Car:
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    Year of Manufacture:
    2001
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    Hi all,

    Am new to these forums but though I'd ask the question to see if anyone may help.

    I have a 318CI 51reg (m43TU engine) with nearly 100k on the clock.

    The engine management light came on the other day so I read the codes as follows:-

    P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
    P0170 Fuel Trim Malfunction (Bank 1)

    P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2) - This was a pending code.

    The car seems to run alright with light on and after I cleared the codes, the fuel consumption doesn't seem to be affected either.

    From reading forums & research it seems to point to the lambda sensors.

    Does anyone know how many o2 sensors my vehicle has on it? RealOem.com shows two on the exhaust!

    Should I replace all the sensors in view of vehicle age?

    Any suggestions on whether I use oem parts or aftermarket and any online parts suppliers to obtain them?

    Your advice would be appreciated

    Stocky2
     
     

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    #2
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    TheEnd's Car Details
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    From those details, you should have 4, and the post cat sensor, bank one (ie for cylinders 1 and 2) is having problems.
     
     

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    #3
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    stocky2's Car Details
    Model of Car:
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    So should I replace pre-cat and post cat sensors?
     
     

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    #4
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    TheEnd's Car Details
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    Nope, by the looks of it, it's could just be a bad connection on the post cat, bank one sensor, but the codes don't give any further info apart from that.
     
     

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    #5
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    kingr's Car Details
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    I had a 318CI with the M43TU engine which threw up those codes and after nearly a year of troubleshooting I finally resolved it by replacing the MAF sensor with a genuine Bosch model. Took 5 mins to replace and the EML never came back! Try to read live data which might point to your MAF.
     
     

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