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Discussion Starter · #1 ·
My wife's car has come up with this code and I have no idea what to do to fix it. It says, P0420 Catalyst System Efficiency Below Threshold (Bank 1). So what is it saying is wrong or what do I need to fix. I am guessing Bank 1 is refering to the pre-cat O2 sensor?
 

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Discussion Starter · #4 ·
Re: P0420 Trouble Code - HELP! (850arrrsaylikepirate)

So I guess I forgot to mention that it has happened twice now. I reset it both times. It hasn't come back on yet, but it only took a few weeks of driving for it to come back. It has around 127,000 I think. So I am guessing it could be O2 or cat, but don't want to fork out the money if I don't have to. Typical scenario with not wanting to shell out more than necessary on these cars.
 
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