Question about 2002 Toyota Camry
The code P0420 describes the problem as
-Three way catalytic converter
-Gas leak on exhaust system
So, to say for sure wether or not you will have to replace the catalytic converter or not without looking at the exhaust system is not practical. I will tell you what is happening though.
The code is coming from your oxygen sensor. It is detecting an improper flow through the exhaust and offers a leak or the catalytic converter as the problem. What you can do is physically inspect the exhaust to see if you notice any rust through on the converter or the exhaust before or after the converter. If you do not see anything then Your catalytic converter could still be at fault as it could be clogged with carbon deposits. It is still possible that the sensor has malfunctioned and is sending a false reading, but most of the time the issue lies withinn the exhaust having a restriction or leak. I hope this helps.
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Posted on Feb 16, 2009
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