I just had my timing belt replaced at the recommendation of the Lexus dealer at a Lexus dealer for scheduled maintenance (91,000 miles). Within 3 days the Check Engine light and VSC light came on.
I took it to an autopart store who read a p1135 code "A/F Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)", to which I replaced today by myself with a brand new Toyota one (part number 89467 by Denso) A/F sensor. 30 seconds after clearning the codes (both through an ODBC2 computer and disconnecting the battery for several hours), the lights came back on and it re-read error code p1135.
Could the dealer and mis-timed my engine resulting resulting in a bad air fuel mixture that might cause this code? Any thoughts on if this is related?
Honestly after spending an $$$ arm $$$$ and $$$ a $$$ leg $$$ replacing the timing belt, all other belts, and the waterpump I'm honestly scared to go back to the dealer and face a several thousand dollar repair.
Thank you.