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Check Engine Code P0420

Tiny
DELOREAN82
  • MEMBER
  • 2001 TOYOTA SIENNA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 158,000 MILES
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.
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Wednesday, December 22nd, 2010 AT 5:21 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
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)
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Sunday, December 26th, 2010 AT 11:42 PM

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