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Old 08-23-2019, 08:46 PM   #79 (permalink)
California98Civic
Cyborg ECU
 
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
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Quote:
Originally Posted by Taylor95 View Post
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...
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.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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