O2 sensor?

[doogz]

Morning all,

I'm new here, picked up my first MR2 at the weekend.

Mostly going fine so far, brakes need some attention, planning on servicing it this weekend, but the engine management light came on the other day too.

It's showing P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

I've done a tonne of googling and searching about on here, but can someone please clarify which one this is? The one after the main cat?

Thanks,

Doug

[dcod]

I believe :

Before Cat:
Bank 1 sensor 1
Bank 2 sensor 1

After Cat:
Bank 1 sensor 2

[uktotty]

This post may help

 l viewtopic.php?f=11&t=11927&p=146489&hilit=p0141+resistor+fix#p146489 l

[doogz]

Thanks guys.

I'm aware it's just the heater that appears to be at fault, but I'd rather just fix the problem properly as opposed to messing about soldering in resistors etc.

Cheers

[dcod]

You could swap 2 sensors and see if you get a different code. If you do then just replace the sensor.

Toyota:
bank 1 refers to bank that includes cylinder 1.
bank 2 refers to bank that excludes cylinder 1.
sensor 1 refers to the sensor being closer to the engine body.

Toyota:
P0141 trouble area -
Open or short in sensor.
Oxygen sensor heater.
ECU.

I'm guessing the sensor has gone.