P0420 Code

Mussolini1996

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So my check engine light came on, so I went to the local auto parts store, and used their diagnostic tool. This is the code that came up: P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1). The check engine light went off after I disconnected the diagnostic tool. I'm wondering a couple of things here:

1. What's the best way to alleviate the problem???

2. Is my car safe to drive since the check engine light is now off???

3. What could have caused the problem???


Thanks in advance.
 
It's a 2002 with 66,000 miles, so I doubt it's the cat. If it comes back on I'll replace one of the o2 sensors. Thanks.
 
I had to have a cat replaced at 38,000. Misfiring coils cause it to run rich and clog the cat.
 
Are you sure its not time to go roll a fatty, and not worry about it...?
(po 420)
 
I hope you get it sorted. In the meantime...


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