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Discussion Starter #1
the check engine light came on in last 50 miles.
run the diagnostic tool today that gave me:

P0420
Catalyst System efficiency below threshold (Bank 1)

i'm not exactly sure what that means. is that the O2 sensor ?
The car has aftermarket K&N air cold air filter intake.

the car seems to running OK, no performance issues at the moment
 

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Darth Chinko
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Discussion Starter #4
I did search of course before posting here. None of the results were conclusive of on the same vehicle. There was still some confusion in what i read that the O2 sensor could still be responsible for this code.

NM state does not require emission - but i would prefer to fix it properly.
Thanks for the links, i guess i'll have to bring it to a shop to deal with this if it's not easy to diagnose.
 
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