Check Engine Code P0420

2001 TOYOTA SIENNA
158,000 MILES • 6 CYL • FWD • AUTOMATIC
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DELOREAN82
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I own a 2001 Toyota Sienna XLE van. The other day i backed my van up and I must have backed into a snowbank, and i believe i got snow in my exhaust pipe. Anyways, now my check engine light is coming on. I pulled the codes and it is coming up with a code P0420. The description says, "Catalyst system efficiency below threshold - bank 1. Possible causes: Air leak in exhaust before H02S (Heated oxygen sensor) Bank 1, AF Sensor error, Faulty Catalytic Convertor? I know a catalytic converter isn't cheap. Some people tell me to replace the oxygen sensor? Please advise..thanks.
Dec 22, 2010 at 5:21 PM
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MHPAUTOS
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This may only be a temp code due to the exhaust being blocked, with the exhaust cleared, do a code clear and go for a drive, re check for codes it may be gone, try this first.

markk (mhpautos)
Dec 26, 2010 at 11:42 PM
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