Oxygen sensor, need help locating which one?

[99solarav6]

Couple of days ago the check engine light came on for my gf's 99 solara. So we had it checked out and it came up with P1135 code. According to the shop they said one of the sensor need to be replaced. They reset the light and said if it comes back then it has to be replaced. Anybody know just by the code which one is it? I think he mention front bank but I'm not to sure.

[alltracman78]

Assuming you have the V6.

Bank 1 sensor 2.

It's actually the A:F sensor.
Basically the same thing.

Bank 1 is the rear for the MZ engine family [V6 is the 1MZFE or 3MZFE].
Sensor 1 is before the cat [so in the exhaust man.].

Basically it's the PITA one.

If you have a 4 cyl, it's the only A:F sensor in the exhaust man [engine only has one bank].
Making it alot easier to get to than the V6.

Just so you know, it is slightly possible it could be the wiring or the ecu.
But 9 times out of 10, it's the A:F sensor.

[ST185]

^^^
Trust the Toyota mech.