Quote:
Originally Posted by Anthony1s
Why? Are the O2 sensors known to go bad? And if it's the downpipe, why should OP spend his money diagnosing other stuff? Especially when his only mod is the dp and the car has so little miles on it.
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Yes, o2 sensors are known to go bad and cause these faults and they are much cheaper/easier to replace then catalytic converters so it's definitely worth a shot in my opinion to rule it out as a possible cause.