I got a response from the code that I sent, P0420 which is Catalyst System Efficiency Below Threshold Bank one but what is the main cause,oxygen sensor? I have noticed that it's using more gas than it should be;please help me out with this if possible
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Got it scanned and it's P0420: Catalyst efficiency below thresholdbank 1. They said it could be a bad catalytic converter or oxygen sensor. I borrowed a scanner and tried to measure the oxygen sensor readings over time.Sep 8, 2011