My 1999 Honda Accord Ex - Check Engine Light - P0420?

#1 (**permalink**) 08-25-2008, 06:43 PM

My Accord got a check engine light - P0420. the car drives fine. i went to auto zone and they said it might be a problem with catalytic converter. how much is the actual cost of replacing?

#2 (**permalink**) 08-25-2008, 06:44 PM

Check this site. http://www.obd-codes.com/p0420

If you end up changing the O2 sensors, make sure you use the ones specifially made for the car if you have a ULEV engine. Its written on the top of the engine. Generic sensors do not work. Before you do change any sensors try the no cost options in the web site.

#3 (**permalink**) 08-25-2008, 06:44 PM

Check engine light could be from the EGR valve, oxygen sensor or anything. Unhook your battery, leave unhooked for 2minutes, rehook and see if light goes off, if you don't have airbags, refer to owners manual about that. Then follow directions about unhooking battery if you have airbags. Be VERY CAREFUL. Chances are if it does go off and then later come back on, its probably your oxygen sensor or EGR valve. God Bless and good luck. Todays cars, the light will come on if you sneeze because they are so sensitive.