2007 Lexus GS350 Code P0430

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Aug 16, 2018 | 12:39 PM

thesmeazy

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Joined: Aug 2013

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From: CA

2007 Lexus GS350 Code P0430

I have a P0430 code on my 2007 GS350 and I wanted to see what's the best way to diagnose the issue. The car is running fine. I am thinking it's either the o2 sensors, exhaust leak or a clogged cat.

I'm not sure if I should first try the cleaner, test the o2 sensor. or take it to muffler shop to see if there is a leak.

Any suggestions?

Aug 16, 2018 | 01:26 PM

tghw

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Joined: Jan 2018

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From: WI

Buy a new Lexus gas cap on EBay before you do anything else.

Aug 16, 2018 | 02:10 PM

thesmeazy

Thread Starter

Driver School Candidate

Joined: Aug 2013

Posts: 15

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From: CA

I have a new gas cap I recently bought. I checked the gas cap and it looks fine.

Aug 16, 2018 | 03:04 PM

MedicalDoc

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Joined: Jul 2012

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From: SC

Mix dish soap with water and, with car on, start spraying exhaust pipes--start with the 'Y' pipe--. You'll notice bubbles if u have a leak.
Is the car louder than normal?