Showing a code P0420 replaced cat and both O2.

Tiny
ANONYMOUS
  • MEMBER
  • 2001 PONTIAC MONTANA
  • 137,000 MILES
Showing a code p0420 replaced cat and both o2 sensors plugs wires seems to run good
Tuesday, March 19th, 2013 AT 1:29 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
There are many things that can cause this code to set. Most times you won't notice any difference in the vehicle unless the converter is melting down. Then you will notice a loss of power. Check out the link I attached for specifics about causes and and possible solutions.

https://www.2carpros.com/trouble_codes/obd2

Let me know if it helps.
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Tuesday, March 19th, 2013 AT 1:40 AM

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