Non corvette tech question-emissions
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Melting Slicks
Joined: Feb 2004
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From: Sarcasm. Just one of the many services I offer.
Non corvette tech question-emissions
My freind has a 99 toyota corolla. it failed inspection because the on board diagnostic test pulled a code po420 which is "Catalyst System Effeciency Below Threshhold"
What does this mean and how is it fixed?
What does this mean and how is it fixed?
Burning Brakes
Joined: Aug 2001
Posts: 1,238
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From: walled lake MI
there are two O2 sensors, one before the cat and one after. the ECM compares the readings between the two and tries to see how good the cat is doing at it's job.
failing this diagnostic usually points to a bad cat, probably a clogged one. as far as i know the only solution is to get a new cat - not cheap.
failing this diagnostic usually points to a bad cat, probably a clogged one. as far as i know the only solution is to get a new cat - not cheap.
Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Ibtl
Originally Posted by ir0nmaiden420
What does this mean and how is it fixed?
Intermediate
Joined: Mar 2003
Posts: 31
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From: Irvine ca
Tempest is 100% correct. Dead CAT.
...check the emissions warranty terms for your state. The emissions warranty goes beyond the standard 3/36 and varies greatly from state to state. Mr. T's national consumer afairs 800 number should be able to help clarify that for you. A bit of a long shot but it may be covered.
...check the emissions warranty terms for your state. The emissions warranty goes beyond the standard 3/36 and varies greatly from state to state. Mr. T's national consumer afairs 800 number should be able to help clarify that for you. A bit of a long shot but it may be covered.
Team Owner
Joined: Aug 2000
Posts: 40,156
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From: San Pedro CA
Originally Posted by CFI-EFI
For a toyota? The crusher.
RACE ON!!!
RACE ON!!!
As for the result, it could also indicate a bad or weak O2 sensor.
Emissions warrantees are federally mandated to 100k miles. It should be covered. If the car bottomed out on a speed bump, that will kill the cat.
