Engine Management Light came on yesterday

[stevemilton]

Out for a drive yesterday and the EML popped on. When I got home I checked the code and it's P0135 - O2 sensor heater circuit bank 1 sensor 1.

I have a few questions; which one of the o2 sensors would this be, would it be ok to drive the car in the short term before it gets fixed, and what would be the best way of fixing it?

Thanks,
Steve.
'03 mk3

[Peter Gidden]

Did you try Google?

http://www.mr2oc.co.uk/forums/42/158309.html

[Garrett]

I'm not familiar with toyota a but I would guess the ecu is not receiving a current draw from a oxygen sensor heater circuit(open circuit) and flags a fault, if 2 sensors are fitted the one above(upstream) of the catalyst deals with fuel trim by monitoring the exhaust gas oxygen content, the other for catalyst conditioning only, I would quess the sensor heater circuit has failed as they can do over time. Replacing the failed sensor would be the cure. I have known some cars run rich when upstream oxygen sensors fail.

[Garrett]

had a quick think about this while daydreaming and you could try disconnecting a lambda sensor, starting the engine and seing wich code then comes up to identify the sensors, ie open circuit sensor 1.

[cabbydave1]

Sensor 1 is on the right sensor 2 is on the left

[Ekona]

Bank 1 Sensor 1 is on the right, Bank 2 Sensor 1 is on the left, and Bank 1 Sensor 2 is after the cat (if not JDM).