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P0420 code #297455 Oct 11, 8:50am Oct 11, 8:50am
Joined: Jul 2004
Posts: 62
Orlando
RedCelly00 OP
Member
2000 Toyota Celica GT
RedCelly00 OP
Member
2000 Toyota Celica GT

Joined: Jul 2004
Posts: 62
Orlando
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?


"Have you ever noticed that anybody going slower than you is an idiot, and anyone going faster than you is a maniac?"
George Carlin
Re: P0420 code [Re: RedCelly00] #297456 Oct 11, 12:13pm Oct 11, 12:13pm
Joined: Jun 2004
Posts: 1,376
Los Angeles, CA
QTRMLR_1
Specialist
2002 Toyota Celica
QTRMLR_1
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2002 Toyota Celica

Joined: Jun 2004
Posts: 1,376
Los Angeles, CA
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.


I get my kicks on EC.
Re: P0420 code [Re: QTRMLR_1] #297457 Oct 11, 1:54pm Oct 11, 1:54pm
Joined: Jul 2004
Posts: 62
Orlando
RedCelly00 OP
Member
2000 Toyota Celica GT
RedCelly00 OP
Member
2000 Toyota Celica GT

Joined: Jul 2004
Posts: 62
Orlando
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.


"Have you ever noticed that anybody going slower than you is an idiot, and anyone going faster than you is a maniac?"
George Carlin
Re: P0420 code [Re: RedCelly00] #297458 Oct 17, 7:48pm Oct 17, 7:48pm
Joined: Mar 2004
Posts: 1
Orlando, Florida
bluecelicagirl00
New Member
2000 Toyota Celica
bluecelicagirl00
New Member
2000 Toyota Celica

Joined: Mar 2004
Posts: 1
Orlando, Florida
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!

Re: P0420 code [Re: bluecelicagirl00] #297459 Oct 17, 9:49pm Oct 17, 9:49pm
Joined: Jun 2004
Posts: 1,376
Los Angeles, CA
QTRMLR_1
Specialist
2002 Toyota Celica
QTRMLR_1
Specialist
2002 Toyota Celica

Joined: Jun 2004
Posts: 1,376
Los Angeles, CA
hi bluecelicagirl00, it could be your cat gone bad(catalytic converter). How many miles do you have on your car?


I get my kicks on EC.
Re: P0420 code [Re: QTRMLR_1] #297460 Oct 18, 8:58am Oct 18, 8:58am
Joined: May 2002
Posts: 6,007
Los Angeles, CA
2001 Absolutely Red Toyota Celica GT
isaac
ECelica Admin
2001 Toyota Celica GT
isaac
2001 Absolutely Red Toyota Celica GT
ECelica Admin
2001 Toyota Celica GT

Joined: May 2002
Posts: 6,007
Los Angeles, CA
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 thumbsup


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Re: P0420 code [Re: RedCelly00] #297461 Oct 26, 7:48pm Oct 26, 7:48pm
Joined: Oct 2004
Posts: 9
oklahoma
2000 black Toyota Celica GT
spddemon
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2000 Toyota Celica GT
spddemon
2000 black Toyota Celica GT
New Member
2000 Toyota Celica GT

Joined: Oct 2004
Posts: 9
oklahoma
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

Re: P0420 code [Re: spddemon] #297462 Nov 3, 11:43am Nov 3, 11:43am
Joined: Jul 2004
Posts: 62
Orlando
RedCelly00 OP
Member
2000 Toyota Celica GT
RedCelly00 OP
Member
2000 Toyota Celica GT

Joined: Jul 2004
Posts: 62
Orlando
yea i have 133k miles


"Have you ever noticed that anybody going slower than you is an idiot, and anyone going faster than you is a maniac?"
George Carlin
Re: P0420 code [Re: RedCelly00] #297463 Dec 14, 10:48am Dec 14, 10:48am
Joined: Dec 2004
Posts: 9
virginia beach, va
2003 blue Toyota Celica GT
lambogt
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2003 Toyota Celica GT
lambogt
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Posts: 9
virginia beach, va
ghjethegh

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Re: P0420 code [Re: lambogt] #297464 Dec 14, 6:47pm Dec 14, 6:47pm
Joined: Jun 2004
Posts: 1,376
Los Angeles, CA
QTRMLR_1
Specialist
2002 Toyota Celica
QTRMLR_1
Specialist
2002 Toyota Celica

Joined: Jun 2004
Posts: 1,376
Los Angeles, CA
^^ now that's post whoring to the extreme. don't start, and you won't have to stop. Just say NO!


I get my kicks on EC.
Re: P0420 code [Re: QTRMLR_1] #297465 Dec 15, 5:52am Dec 15, 5:52am
Joined: Sep 2004
Posts: 60
Ann Arbor, Mi
2002 black Toyota Celica
Toyotapartsdude
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2002 Toyota Celica
Toyotapartsdude
2002 black Toyota Celica
Member
2002 Toyota Celica

Joined: Sep 2004
Posts: 60
Ann Arbor, Mi
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.

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