Hi all,

I've had a niggling overfueling fault when cold - I have changed the coolant sensor, MAF for genuine new & O2 sensor replaced with 'known good' Bosch one.

I have done a live data read with ECUEXPLORER to see the O2 reads at 0.8v when cold which would explain the fueling.
I was told it could be a 'lazy' O2 sensor & that if I disconnect it, it wouldn't harm IF the sensor was faulty.

I ran the car for around 15 miles today & it felt smoother.

So, to the title - I was expecting the CEL to light up but it didn't...
I reconnected the O2 just now and checked for codes by joining the black wires under dash - it had no codes stored still !

Any pointers would be appreciated - car is a standard UK Turbo 00MY

Thanks,

wazlee

 

I guess the 02 sensor is not very important to the car. It's one of the (maybe the only) sensors you can disconnect without getting a CEL.

Have you used a wideband to measure the overfueling? What values did you get? Are you using a standard FPR?

 

Cheers saiklon,

It's the OE standard FPR on the car at the moment.

I've not had a reading with a wideband yet, just ECUEXPLORER which pointed out the high voltage when cold - when warm it scales as should.

I have reset the ECU and then straight away disconnected the sensor again - it is running 'sweet as' now - so I'm guessing it is Fekked

 

If your o2 sensor is goosed,as you say it wont throw up a cel.If you reset the ecu using green & black connectors then it should flash up code 32 if sensor is knackered iirc.