The P1135 code on your Toyota is Air fuel ratio sensor - heater circuit malfunction. Basically
the problem there will be with the air/fuel ratio sensor (on other vehicles
it is refered to as an O2 oxygen sensor), or the wiring/connectors leading to
it. It could also be a problem with a fuse or relay on the heater circuit. Again,
not a real difficult problem to solve.
just fixing the P1135 code will not cause the check engine
light to stay off because there are other unrelated codes. If the code P1135
was causing the other problems then perhaps fixing that code would fix the others,
but that's not the case here. The reality is you'll need to have all the problem
areas looked at (IAT sensor, MAF sensor, Air/fuel ratio sensor) and repaired
in order for your engine light to stay off. Normally if there are codes stored
a vehicle cannot pass inspection. I would get a second opinion from another
local mechanic as what you've been told may not be 100% correct.
Good luck.
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