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Check Engine Light, VCS Light - P0420

Discussion in '4th Gen 4Runners (2003-2009)' started by abright4thgen, Apr 18, 2023.

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Apr 18, 2023 at 4:24 PM

#1

#1
abright4thgen [OP] New Member

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Mar 25, 2022

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2005 4-Runner 4th Gen

None yet

quick fixes for this one?

abright4thgen, Apr 18, 2023

#1

Apr 18, 2023 at 4:26 PM

#2

#2
abright4thgen [OP] New Member

Joined:

Mar 25, 2022

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#26296

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2

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2005 4-Runner 4th Gen

None yet

here's what the mechanic said.

abright4thgen, Apr 18, 2023

#2

Apr 18, 2023 at 5:36 PM

#3

#3
xtremewlr New Member

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First Name:

Todd

Tucson, AZ

Vehicle:

2003 4Runner V8 Limited 4WD

Lots with more in the works

V8 or V6?

I recently had this issue on my V8 and replaced just the O2 sensor. Driver side in the case of the V8. V6 I think is actually passenger side for the P0420.

Code came back once as a pending code. I then replaced the exhaust gaskets for the y-pipe/crossover pipe, which is after the cats, and the code has not come back since.

Just my experience, not saying it will fix your problem but it's the cheaper route to start with IMO.

xtremewlr, Apr 18, 2023

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