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Re: CEL on - oxygen sensors? How many do I have? (VolkSchnell-GTI)

OBDII 2.0L engines have two ox sensors one B4 and one after the cat converter. These puppies are like $130-150 each so make sure the DTC read out tells you which sensor, if any is giving out bad signals. Ol single wire sensors for CIS were less than $30 so if you changed one out that didn't need to be changed was no big loss, but anything over $100, I sure don't like to change out parts that are still good! OBDII standard codes are required by the Feds to list bad sensors so they should be able to tell you exactly what's defective, not just something vague like "emissions system problems".
 
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