I keep getting P1135 and P1155 Codes for reasons why my check engine light comes on.
I recently went to get the Safety and Emissions test done and was immediately FAILED because of a check engine light indicator. The Codes that came back were P1135 and P1155 for Air/Fuel Ratio Sensor. I was told by the NAPA Auto parts store to replace the rear sensor first (P1135) and then clear and reset the check engine light because often that is the reason for both codes being pulled. Changed the rear sensor, took it back, reset the system and the light immediately came back on with both codes being pulled. The main question is could this be something else? I don't want to replace both expensive sensors if that is not the real problem. What else could this be? What can I do to fix the problem? Any help would greatly help.


