Hello Car gurus.
I have a Ford Mustang 2005 with 17,000 original miles on it. Last year I noticed that the engine light came on after taking it to get the wheel alignment done. I checked it on one of those hand held OB11 reader unit, and it popped up as P0420 and a pending P0430 code.
Many people I ask are saying it's the CAT that may have gone bad, but is that possible since I barley drive the car? There were some modifications done, including adding in a performance chip, plus changing out the headers, and the air filter.
However, those mods I mentioned were done over 7 years ago, and no issues with check engine lights, or passing the emissions since.
Can someone let me know if it's possible that the CAT could go bad in 10 years at 17,000 miles? Should I just change out the O2 sensors for the bank 1?
The readiness monitors seems to all be showing green, but since it's throwing this code I think it may not pass emissions.
How to proceed....?
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