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2005 Celica GT
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861 Posts
Discussion Starter #1
I scanned my Matrix a few days ago and got code P0420. It said that the forward catalytic converter is bad. I priced one at Advance, Autozone and O'Reilly's and they are in the neighborhood of $375 for a direct fit replacement. I looked on eBay and they are somewhat cheaper and supposedly also direct fit. The car runs fine as it is with 205k on it. I reset the code, changed the plugs out for Bosch Iridiums because it had Denso platinums in it and the code hasn't come back, yet. Any suggestions would be greatly appreciated!


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The 1ZZ on the Matrix likes Denso Iridium plugs, not platinum. If you have the 2ZZ, you definitely don't want to use platinum.
Every P0420 I've seen is from a bad downstream oxygen sensor, not a catalytic converter. If you haven't seen the code come back though, ignore it until it does.
 

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05 camry 07 tacoma
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2,361 Posts
Unless plugs were really bad, changing them may not be the fix for the error code.
At 205 k cat losing its efficiency is probably correct.

Rockauto.com has CARB cat for $300.00.
For a cheap fix may try a O2 spacer adapter extender that could hold off the error code if/ when it returns.

Are engine parameters such as fuel trims, O2 sensors within spec. No other error codes?
Oil consumption, exhaust leaks ?
 

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Registered
2005 Celica GT
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861 Posts
Discussion Starter #3
Unless plugs were really bad, changing them may not be the fix for the error code.
At 205 k cat losing its efficiency is probably correct.

Rockauto.com has CARB cat for $300.00.
For a cheap fix may try a O2 spacer adapter extender that could hold off the error code if/ when it returns.

Are engine parameters such as fuel trims, O2 sensors within spec. No other error codes?
Oil consumption, exhaust leaks ?
I wouldn't jump on the cat. Look at the 8th Gen Corolla/Matrix forums. A lot of us have over 250k on our original cats, our engines also burned oil.
 

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1,264 Posts
I had 0420 several times on Corolla. Still on the same cat, same sensor, same canister. Just a matter of cleaning... Its been 2 years since last cleaning and no code yet.

Edit: Make that more than 3. Last renewal, we did not have it though I did the seafoam cleaning. We have a renewal next week so I am doing another seafoam cleaning treatment. I normally do one annually.

Also on our honda, after a 0420 that came back couple times, I had installed a spacer. It has been 5+ yrs now since and no code. I had posted that several times on subforums also.
 

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Camry_owner
2003 Camry LE 2.4L
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107 Posts
I had 0420 several times on Corolla. Still on the same cat, same sensor, same canister. Just a matter of cleaning... Its been 2 years since last cleaning and no code yet.




Hi, could you please tell me what kind of chemical I use or how do I clean the O2 sensors/catalytic converter.I am going to physically remove the O2 sensors and catalytic conveter.Want to know if anybody has any idea how to cleam them. Kindly let me know.
 
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