Codes p0135 and p0155

2003 TOYOTA AVALON
141,000 MILES • 6 CYL • 2WD • AUTOMATIC
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ROY00854
  • MEMBER
  • 1 POST
Replaced both sensors with Denso's and light comes back on seconds after starting engine. All fuses are good and switched relay. Bad ECM?
Aug 29, 2019 at 12:47 PM
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KASEKENNY
  • ✓ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
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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Aug 29, 2019 at 6:42 PM
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