ES 300 P0420 issue - fixed - ClubLexus - Lexus Forum Discussion

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ES 300 P0420 issue - fixed

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Old 09-16-18, 06:29 AM
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satiger
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Default ES 300 P0420 issue - fixed

As I have reported back, I was having P0420 issue for some time now. It started as intermittent CEL and later became steady on CEL with P0420. Even a reset wouldn't last no more than 200 miles of drive. Lexus and other shop confirmed catalytic converter needs to be replaced (part no 17410-20310). OEM would cost around $900- $1000 + labor !.

Found a decent one from ebay for $100 and paid $200 for labor and replaced it yesterday. It took about 2.5 hrs due to age. had to use torch to loosen some bolts.

Its too early say anything but I am sure this will keep P0420 CEL away (I am due for State inspection in this Dec!). When replacing catalytic converter I had the gaskets replaced as well. (90080-43036 2 pcs, 17451-74051 1 pc). Current miles : 319k.

Previous post : https://www.clublexus.com/forums/es-...00-000-km.html
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Old 09-16-18, 07:31 AM
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Mine has the same issue, I just keep resetting the code every few months when the light comes on. I have put foulers on my 02 Sensors, and that fixed the majority of the issue (CEL used to come back right after it was cleared), but I fear this is only a stop-gap measure, and eventually I will have to bite the bullet.
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Old Yesterday, 01:24 PM
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Oops - I spoke tooooo soon. Lights came on, frustration

Besides using oxygen sensor fouler, what other options do I have?. Should I replace the oxygen sensor right next to (out) catalyst convertor?. I doubt the cat converter I got from ebay was bad as outside condition looked very good and no sound when shook.

Any suggestions?
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