Quote:
Originally Posted by Taylor95
A shop that I trust did the job. However, the car in question is a subaru...
A clogged cat would be easy enough to diagnose once I get the car on jack stands.
I really hope the code is just because of a dirty air filter or something...
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For what it is worth, my CAT is still running strong after the cleaning. I have twice seen isolated returns of the P0420 CEL. They were months apart. Both were on long trips on a hot day. The second event was during a high mountain climb into the high desert of SoCal, under significant load fir a long duration. Each time, clearing the code with my ultra gauge did not produce a recurrence. I think this indicates that the clean is good, but the CAT does not become "new" as a result.