I have a 2001 Camry, LE with 58K on it. The Check Engine Light came on, brought it to toyota dealer to read the CEL code ( costs $50 cdn). Their report says the cause is P1135 - Bank 1 Sensor 1 Malfunction. Recommend to change sensor B1S1. The toyota dealer told me it will cost $260 (cdn) parts and 1 hour labour. I decided to take the car to an independent mechanic. He changed the o2 sensor (NGK brand) near the engine manifold, the check engine light still came on. So he put the old sensor back and told me to take the car back the toyota dealer because it could be a much more serious problem ie the computer module or anything from the sensor back.Is he right? Or could it be the the brand NGK vs Denso sensor he used. Or could it be the o2 sensor located underneath the car located behind the catalytic converter.
Thanks All