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Joined: Nov 2002
Posts: 489
Senior Member 2002 Toyota Celica GT
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Senior Member
2002 Toyota Celica GT
Joined: Nov 2002
Posts: 489 |
Ok, so I'm driving down interstate and my CEL comes on. Not the first time in the past month. But I did stop this time to get it checked.
Code P0420 - Catalyst System Efficiency Below Threshold (Bank 1) -Gas leakage on exhaust system -Open or short in heated oxygen sensor circuit -Heated oxygen sensor -Three-way catalytic converter
My car only has 63,xxx miles on it. The AutoZone guy suggested the O2 sensor. Any one else get this code? What can be done to test the different aspects of the possibilities and how can I fix it?
"Everything that has a beginning, has an end." -The Oracle
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Joined: Dec 2004
Posts: 15
Member
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Member
Joined: Dec 2004
Posts: 15 |
I had the same code after i installed my TRD exhaust. One of your o2 sensors needs to be replaced or it has caused a minor leak around that vacinity. My problem was that my brother stripped my o2 sensors threads and it was leaking air at that port throwing that very same code. Luckily he is a engineer and borrowed a tool and die kit from work and retapped it. No problems since.
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Joined: Dec 2004
Posts: 400
Senior Member 2002 Toyota Celica
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Senior Member
2002 Toyota Celica
Joined: Dec 2004
Posts: 400 |
Get a scanner that can read the O2 values while the engine runs. Let the engine temp rise and check the voltage fron the O2 with the scanner. If there is voltage than you can scratch the short/open in the circuit. If I'm not mistaken, Isn't the emission systom on this car covered under a 100,000 Mile warranty???
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Joined: Jun 2004
Posts: 1,694
Metal Storm 2040 2000 Toyota Celica
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Metal Storm 2040
2000 Toyota Celica
Joined: Jun 2004
Posts: 1,694 |
yeah i've been running my GTS with cel on for like a month now with 6 thrown codes as well as the one mentioned in this thread.
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Joined: January 2004
Thank you.: Mama thomas, michelle, mike, scooby,leeo,heavensknight crew westbury,ny Random: Night time is my time come out and play see ya in the streets.
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Urgent
by SoloXKay - Mar 19, 2024 11:58am
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