Codes P0135 and P0155

Tiny
ROY00854
  • MEMBER
  • 2003 TOYOTA AVALON
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 141,000 MILES
Replaced both sensors with Denso's and light comes back on seconds after starting engine. All fuses are good and switched relay. Bad ECM?
Thursday, August 29th, 2019 AT 12:47 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

I attached the diagnostic info. I suspect you have a wiring issue. However, the fact that you have both codes, it may be an issue with the ECM itself. Running through this information will identify which one it is.

Let me know if you have questions and I will help answer them for you. Thanks

https://www.2carpros.com/articles/how-to-check-wiring
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Thursday, August 29th, 2019 AT 6:42 PM

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