Celica Forums General Discussion Exterior P0420 code

I got this code on my CEL. Sometimes it goes off by itself but i think the sensor is finally dead. It says its the cat sensor. Can anyone give me an idea as to how uch it is and whether or not I can replace it myself?

I checked and: It could be an exhaust system leak, a malfunctioning 02 sensor, bad wiring to an 02 sensor, or a bad catalytic converter.

Get under your car and check for possible exhaust leaks.
Check your wires under your car that run between the underbody and the O2 sensors.
Just like we spray the MAF with Disc Brake Cleaner, Carburetor/Throttle Body Cleaner (even though we don't have a carburetor) etc, you can try spraying the O2 sensors(but make sure you won't harm the sensors with the spray chemical), but first consider:
How many miles do you have on your '00 Celica? And is that the original stock CAT on the car (assuming of course that you are the original owner of the car and not another person who used an aftermarket and put the stock back on and then sold it!). Hey, I just think of as many possibilities as I can 'cause I can't help it.

Yea my celly has 130k on it and is the original so it would make sense that something would start to fail me. I'll check under my car and see what's what.

Hey! My car is coming up with the same code. Can you tell me how hard it's going to be to replace the sensor? [email]Roxygirl818@hotmail.com.[/email] Thanks!

hi bluecelicagirl00, it could be your cat gone bad(catalytic converter). How many miles do you have on your car?

Toyota warranties the emissions system to 8 years or 80,000 miles...

bring it in for inspection when you get your next oil change done AT a TOYOTA service center

I had the same code come up on my celica, I needed a new o2 sensor and a new catalytic converter... an o2 sensor in $100. and can be replaced yourself

yea i have 133k miles

ghjethegh

^^ now that's post whoring to the extreme. don't start, and you won't have to stop. Just say NO!

hes over 80k , thier not going to warranty it
and if it is a catalytic converter theres no way hes gonna get out of there for $100.