why code p1155 appears after 1135 a/f sensor replaced ?

Question

I have a 2001 Toyota rav4 with 2.o engine. code 1135 appeared and a/f ratio sensor was replaced (the one in the center of the silver heat shield.2 months later(two days ago) got code p1155...what is the problem...im confused to say the least need help !!!. thanks in advance bob1...

Answer 1

Hi there,

These codes point to the front O2 sensors on both banks. Since it's affecting both banks, I would check the fuse under the hood for the O2 sensor heater. If the fuse is good, check the wiring. Here is a list of other possible causes.

P1155 TOYOTA - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1

 

 

Read more: https://www.autocodes.com/p1155_toyota.html