Toyota Camry 2002 cant pass emissions(code p0420)

Jose Alvarez’s question:

i have a Camry 2002 and i cant pass my emissions test because of code p0420(catalyst efficiency below threshold)what does this mean and is it expensive to fix????”


That code means either the oxygen sensors are getting weak, OR the catalytic converter itself is getting weak. BUT, you can often just have the computer reset with a scan tool and drive the car about twenty miles on the highway. After doing this, if the check engine light stays off, you should be able to pass the test then. If it comes back on before you get it reinspected, then you will have to repair it to get the sticker.

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