The Check Engine Light on my 2000 GS300 went on. The OBDII code is P0141, which indicates HO2sensor bank 1 sensor 2. This engine is an in-line 6. Can anyone advise me as to which sensor needs replacing and how difficult the job is?
Thanks.

Would it be worth resetting the ECU first, to see if that clears it and it goes away for good? Remove EFI and ECTS fuses for 30 seconds (long fuse box under bonnet), reinsert them, leave the key in the "run" position for 6 minutes, turn off and then try starting the car, see if the CEL's gone (and stays gone).

Or just clear the error using the OBD reader that gave you the code in the first place!

Good luck!

I have exactly the same code and the same problem, anyone know which sensor this is I need to replace

Thanks
Paul

Is bank one (cyl 1,2, and 3) at the front of the engine bay or the rear?

Thanks

Would guess that bank 1 is before the main cat and bank 2 is after. Sensor 2 in bank 1 would probably be for cylinders 4, 5 & 6. That's where I would start anyway.

Bank 1 refers to bank that includes cylinder No.1.
Bank 2 refers to bank that does not include cylinder No.1.
Sensor 1 refers to the sensor closer to the engine body.

Does that mean that there are 2 sensors for each bank as the fault is bank 1 sensor 2?

I think there are 3 sensors in total. One for each exhaust branch and then one after the main cat.

The bank x sensor x format is a OBD-II standard and has to allow for all engine designs.

Cheers guys,

I located the one I need and have ordered the replacement, will fit it myself. Will cost me £64 in total compared to the £310 Lexus wanted

I think there may be 5 O2 sensors in total, 1 before and after the pre-cat for each bank and then one after the main cat