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Discussion Starter #1
Hello please help I've had a diagnostic done on my 2002 mk4 1.6 golf it had a fault code saying co2 lambda sensor well when a tempting to order one there seems to be a front and rear sensor which on could it be?
 

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Did it say bank 1 or bank 2?
 

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Is the car running poorly? If not then it's the rear o2 sensor after the catalytic converter. The one before the cat. is responsible for air fuel ratio and will cause the car to run badly if it is bad.
 

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Discussion Starter #4
I'm not sure what bank it said just got told it was co2 sensor Yes the car runs bad will pull back then go again I'm hoping it's the front as it's cheaper but I guess I'll change the front then if not better will do the back
 
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