2001 E46 318i Loon SE N42B20 - Lambda B2S2 location

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  1. 2001 E46 318i Loon SE N42B20 - Lambda B2S2 location 
    #1
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    Hi guys, noob question but does anyone know on the 4cyl models which sensor is bank 2 sensor 2. I imagine its the one nearest the end of the exhaust? These are my error coeds, seems like someones snipped my sensor wires or is broke as it seems to not read it at all. Will inspect as long as i know its the right one. Cheers!
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    Bump. does anyone know?
     
     

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    It would seem that way, Bank 2 is always the cyl 3/4 =4cyl, cyl 4/5/6 = 6cyl, or 5/6/7/8= V8

    Sensor 2 is then the post cat / cat monitoring sensor.
    It looks like you only have one in this case.
     
     

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    Thanks for your reply, what is the usual for replacing faulty sensors, like do people buy bmw ones at £130 each, bosch at £85, bosch universal at £45 or generic universal at £10 upwards? reliability asside do other makes still have similar tolerances and suitability etc?
     
     

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    I would go for a Bosch sensor.
    Maybe check the plug, as it seems to be totally dead.
     
     

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    Will do thanks for your advice!
     
     

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    Just an update, got under the car and looked at the plug and it wasn't even connected! it was pushed together but not clipped and consequently all the contacts were green, so bit of filing sanding and cleaning, and seems to be working, no error codes after 4 days. Lesson: Always check the simplist things first.
     
     

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    Now that's proper diagnostics.

    The sensors give a code, but you need to read the code and understand it. If you get no activity on both the lambda sensor heater, and no signal, there's a good chance it is dead or disconnected.

    If you get fuel trims high or low, it could be a problem elsewhere, or if it says switching time too long, the sensor is old and worn out.
     
     

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