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
