actually got it done already, found some nice info on ToyotaNation site.
P1155 means heater on o2 sensor is not working. Bank2. Sensor 1
On 6 cyl cars bank 1 is the one that include cyl 1. bank 2 is the other one. sensor one is before catalytic converter and sensor 2 is after. Good thing for me bank 2 is near the radiator so it was very easy to access it.
Non OE sensors are about $75 but require some rewiring. Not a big deal. All set. No more trouble codes.
steve k.
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