SES Code
01-17-2005, 07:51 PM
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SES Code
I just got a code read on my truck. P0420 "Catalyst Efficiency Below Threshold (Bank 1)". I just wanted to make sure that this is the rear O2 sensor saying that the cats aren't working properly. Am I correct to assume that this will not mess with my A/F ratios?
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legerwn
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11-15-2015 10:21 PM