cribby22
New Member
Looking for advice or prior experiences. I have an 18 Expy with 98,000 miles. I had been experiencing intermittent P0420 codes for over a year. Clearing the code would buy me 3-4 months without a CEL. In April this year, the light came back on several times after resetting. After researching on this forum and others, I decided to go with SPD catted down pipes in May. Changed out the rear O2 sensors as well. Things have been great until this week. Now I’m getting a P0420 code. After warming up the engine, live diagnostics show fluctuating high and low readings in the O2 sensor I’m at idle on bank 1. Im feeling defeated here. On top of it, I need to pass emissions this month.
Has anyone else had similar issues?
Has anyone else had similar issues?
