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9th Gen Corolla/1st Gen Matrix (2003-2008) 9th generation Corolla and 1st generation Matrix discussion.

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Old 01-20-2005, 01:18 PM   #1 (permalink)
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Question CEL / P0420 code

My CEL [check engine light] came on and AutoZone read the code as "P0420". I called the dealer and he said he'd have to look at it but he said maybe it was something they could "fix" and not have to replace. He quoted me $228 if they replaced the "filter".

I took it to another Toyota dealer to confirmed it was the P0420 code. The report said the "catylyst system running below threshold. Catylytic converter and 02 [oxygen] sensors failed." There are four sensors and two apparently are bad. The CC is under warrenty [for another 5k] so it's covered but the sensors are expensive [$141/125] and the bill is $503.67. I had to paid for the sensors before they could order.

When I get back in the car the "check engine light" is off. What's up, did they "fix" the problem and now just replacing parts for nothing. Maybe they just reset the ECU, but if the CC is bad would the light come right back on? The CC will be out of warrenty soon, should I just bit the bullet and get it replaced now or ask for my money back on the parts? Here's another question. If I do that could I still get the CC replaced N/C at a later date because it was documented to have failed BEFORE the warrenty ended? Thanks.

MikE

Last edited by mothaudio; 01-20-2005 at 01:19 PM.
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Old 01-20-2005, 06:59 PM   #2 (permalink)
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P0420 is Catalyst System Efficiency Below Threshold (Bank #1)
Trouble area:
- gas leakage on exhaust system
- oxygen sensor
- three-way cat. converter

http://manual.shulsmann.com/Repair%2...5/dtcc4000.pdf (see page 2)

http://manual.shulsmann.com/Repair%2...05/cip0420.pdf

Your CEL turned off when you got back in the car because the OBD2 scanner that reads the code will clear the CEL.

Also, I think you shouldn't be paying a dime to fix this. The sensors fall under Emissions and should be covered. Then again, depends how much mileage you have?
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Old 01-20-2005, 07:03 PM   #3 (permalink)
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"Also, I think you shouldn't be paying a dime to fix this. The sensors fall under Emissions and should be covered. Then again, depends how much mileage you have?"

Thanks, I'll explore that tomarrow! I have almost 75,000 miles. The emission warrenty in Ohio is 8 years or 80,000, whichever comes 1st.
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Old 01-20-2005, 08:36 PM   #4 (permalink)
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I'm only guessing it does but you'd think it should.
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Old 01-20-2005, 09:46 PM   #5 (permalink)
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The Toyata website states that "... specified major emission control components are covered for 8 years/ 80,000 from date of use". That's pretty vague. I Emailed them about the 02 sensors.
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Old 01-20-2005, 09:58 PM   #6 (permalink)
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You'll like the second sentence in this writeup:
http://auto.howstuffworks.com/question257.htm

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