2000 E46 325ci Error Codes

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  1. 2000 E46 325ci Error Codes 
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    Got my scan tool and showed up three faults:
    P0160 Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
    P0161 Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
    P0174 System Too Lean (Bank 2)

    Anybody any ideas how to fix these?
    I am hoping it's just one thing
    I suspect coil packs, but bit of a guess
     
     

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    That's a lambda problem, it's getting no response from it, and the heater isn't working, so it looks like either a new lambda sensor or check the plug on the one fitted.
     
     

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    Quote Originally Posted by TheEnd View Post
    That's a lambda problem, it's getting no response from it, and the heater isn't working, so it looks like either a new lambda sensor or check the plug on the one fitted.
    So a new lambda sensor at worse case?
    Heater as in to heat the cabin?
     
     

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    There's a heater for the lambda sensor, they only work properly when hot, so they have a heater in them to get them up to working temp quicker.

    That's why you'll often have them in the exhaust manifolds now to got them hotter quicker.

    To have both a missing signal, and no response from the heater points to the sensor being unplugged, or the wiring damage.

    Bank 2 Sensor 2 should be the second lambda sensor on the pipes leading from cylinders 4,5 and 6, which is the rear half of the engine.

    You'll see the first 2 sensors in the manifolds by the engine, the other 2 are underneath by the cat.

    If you've had any work done recently on the exhaust or underneath, I'd check the plugs are making a good, dry connection.
     
     

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