2003 E46 318ci, oxygen sensor problem

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  1. 2003 E46 318ci, oxygen sensor problem 
    #1
    Bimmer Fan
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    sei_saw_jai's Car Details
    Model of Car:
    318 ci sport
    Year of Manufacture:
    2003
    Transmission Type:
    manual
    Car Body Type:
    coupe

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    hi, im new here. cutting a long story short, i have a 2003 bmw 318 ci sport. 2L, had the car for over a year, then started firing codes at me. used the peake tool recoved code table 21 fault 271D "Oxygen Sensor heater before cat". according to RealOEM below there are 5 Oxygen sensors. how do i determine which one i need to change, as its only came up with "Oxygen Sensor heater before cat"

    http://www.realoem.com/bmw/showparts...43&hg=18&fg=10

    any help would be appreciated,
    thankz
    Mike
     
     

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    #2
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    Before cat = pre cat = no. 12 in the 2nd diagram for your car.
     
     

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    #3
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    sei_saw_jai's Car Details
    Model of Car:
    318 ci sport
    Year of Manufacture:
    2003
    Transmission Type:
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    thankz NealP,
    i'll give it a try and see what happens. i have one more question, there are 5 sensors on e46, 2 on the manifold down pipe, 1 on the manifold connection, 1 before the cat and 1 after the cat. i have read on other forums that there are 2 pre-cats and 2 post-cats, what is the other odd one doing? or are there 4 pre-cats and 1 post cat? how are they categorised.

    thankz
    Mike
     
     

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    There are 2 types of exhaust systems on the 318. Best thing to do is get the car in the air and see if you can identify the sensors yourself.
     
     

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    #5
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    sei_saw_jai's Car Details
    Model of Car:
    318 ci sport
    Year of Manufacture:
    2003
    Transmission Type:
    manual
    Car Body Type:
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    alright, what's the other type?

    thankz
    Mike
     
     

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    #6
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    sei_saw_jai's Car Details
    Model of Car:
    318 ci sport
    Year of Manufacture:
    2003
    Transmission Type:
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    does anyone know the difference between a "REGULATING LAMBDA PROBE" and "Lambda Monitor sensor"?

    any help would be appreciated
    thankz
    Mike
     
     

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    #7
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    Regulating is the pre-cat and the monitor is after cat. That's how your emissions are calculated.
     
     

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    #8
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    sei_saw_jai's Car Details
    Model of Car:
    318 ci sport
    Year of Manufacture:
    2003
    Transmission Type:
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    coupe

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    thankz for the reply NealP,
    i see. just had the car up on ramps today, noticed the bimmer only have 2 sensors, down the centre pipe. nothing on the manifold. cylinder 1 and 4 goes down 1 pipe and 2 and 3 down the another but cant see any other sensors on the manifold.

    so the one i need to change is no:12 (on the diagram)?

    thankz
    Mike
     
     

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    #9
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    That's the one. The above diagram is the alternate exhaust system I was referring to
     
     

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    #10
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    sei_saw_jai's Car Details
    Model of Car:
    318 ci sport
    Year of Manufacture:
    2003
    Transmission Type:
    manual
    Car Body Type:
    coupe

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    alright, i see. thankz for all the help NealP. will follow up on the problem whether its solved or not.

    thankz again.
    Mike
     
     

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