Thread: code p0138 - O2 sensor, HFCs dead?
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Old 03-03-2014, 01:17 PM   #2 (permalink)
Grindkiezer
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HFC and Test pipes are known to just foul O2 sensors. I don't think its anything major, are you sure it just isn't placebo seeing the CEL and then thinking that the car has made changes?
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