2004 Corolla CODE PO 420 137,000 miles - Toyota Nation Forum : Toyota Car and Truck Forums


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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 12-13-2010, 08:43 AM   #1 (permalink)
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2004 Corolla CODE PO 420 137,000 miles

Went to Toyota with an engine light. They said the code was PO 420 and i needed a catalytic converter and new front and back washers. They wanted 1500 to replace.

Where can I get a decent price converter and washers? I have a mechanic that charger $15 an hour to work on my car. I normally take to Toyota to get a diagnostic but buy somewhere else and let my mechanic put the stuff on.

Thanks
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Old 12-13-2010, 12:08 PM   #2 (permalink)
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Use this link to read the earlier post on this topic.

2004 Corolla P0420 Code

I used Walker direct fit exhaust parts to replace the cat. converter. They have a five year, 50K mile warranty. You can buy them at local parts store or online for about $300-400. Don't go cheap with the generic converters for under $100. You'll regret it.

When you say 'front and back washers' did you mean front and back oxygen sensors? Those sensors are recommended to be replaces after 100,000 miles and are often replaced at the same time as the cat. converter. They are available at most auto stores and cost $75-100 each for direct fit replacements.
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Old 12-14-2010, 08:44 AM   #3 (permalink)
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I agree with aspen007, buy a good aftermarket converter as the cheapie genereic ones will haunt you in the near future.

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Originally Posted by aspen007 View Post
Use this link to read the earlier post on this topic.

2004 Corolla P0420 Code

I used Walker direct fit exhaust parts to replace the cat. converter. They have a five year, 50K mile warranty. You can buy them at local parts store or online for about $300-400. Don't go cheap with the generic converters for under $100. You'll regret it.

When you say 'front and back washers' did you mean front and back oxygen sensors? Those sensors are recommended to be replaces after 100,000 miles and are often replaced at the same time as the cat. converter. They are available at most auto stores and cost $75-100 each for direct fit replacements.
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Old 12-14-2010, 10:05 AM   #4 (permalink)
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Are they positive that code is for the cat and not for the back O2 sensor?

Last edited by mikered30; 12-14-2010 at 08:20 PM.
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Old 12-16-2010, 01:19 PM   #5 (permalink)
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strange

The check engine light went out a couple days ago...As long as out i am not going to worry. Any additive i can add to the gas to clean the pipes out?

thanks
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Old 01-02-2011, 04:31 AM   #6 (permalink)
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Well, i wish my P0420 code would go away.

I'm down to replacing my cat. Already replaced spark plugs, and downstream O2 to no luck but still pass emissions with
flying colors.

See with a P0420, it doesn't take much to set it off.

Also there is no additive to clean the the pipes out if not make it worse.
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