tieu

1999 ES 300 check engine codes are

P1135
P1155

Which points out to air fuel ratio sensors. had someone at toyota OHM out the sensors and concluded both A/F sensors are bad.

Order two new sensors from toyota
part numbers are
89467-41011 - front
89467-41021 - rear
Those are the new parts in the front and rear, 89467 = air/fuel ratio sensors. the old sensors that came out were
89467-48011 - front
89467-41021 - rear

So all of them are pertaining that they are all air/fuel ratio sensors so they all must be the right part. This car has 2 A/F sensors and 1 O2, the only check engine light brings up are the air/fuel ratio. Both sensors were replaced, but the code is still there.
I think theres a wiring problem?

Should I check the ECM or how should I start checking out teh grounds any tips?
thanks

Revenge Motorsports

I would recommend replacing all the sensors at the same time.

tieu

so your suggesting I should replace the O2 sensors along with the 2 A/F sensors?

GEORGE_JET

I would recomend checking your wiring. If you need a good diagram and more detailed info, send me a pm. I have a article that would help, unfortunatly it is 540 kb large and the limit to upload here is 490.