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Air Leak
Randall I dont know about your model of car but my Bosch O2 sensor was 166 bucks. But your points have merit.
JJ your mechanic is correct, Not discussed much but the cause of most codes thrown is a vaccum or air leak in the system. My mechanic confirms this and has told me that very few times has he had to replace the O2 sensor.
But everyones car has its own personality and reacts differently.
If you knew the codes and shared them with this community, some of us can share
the wealth of info to help you..The porsche community has never come up short in that area for me.
Chris
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