P0421 & P0431 for years...
#11
The guy complained of bad fuel economy so its probably the pre cat sensors. The faults been on the dash for years so the faulty cat and sensors should be replaced but I don't think its a high priority that's all
Edit: yeah I was wrong, my logic made sense at the time. Replacing all 4 o2 sensors and cats will rid the fault and should return both power and fuel economy.
Edit: yeah I was wrong, my logic made sense at the time. Replacing all 4 o2 sensors and cats will rid the fault and should return both power and fuel economy.
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