Cupra 300 over fueling

[Beef46]

Bit of an update. Car went back to the dealer and it looks like they may have found something. They checked the oxygen sensors and I think they said they pre-cat sensor was asking for 5% fuel and the post cat sensor was always asking for 100% fuel!

It's going back in a couple of weeks to have the sensors replaced. Fingers crossed that cures it.
I will update again once this has been done.

 

[RUM4MO]

That sounds strange as the pre cat probe is part of the fuelling control system and the post cat probe is just a monitor probe so it should not have any influence on the fuelling level - only warning for emissions being out of allowed levels.

Edit:- hopefully you have just picked them up wrong and it is the pre car probe that is forcing this over fuelling.

 

[Beef46]

That sounds strange as the pre cat probe is part of the fuelling control system and the post cat probe is just a monitor probe so it should not have any influence on the fuelling level - only warning for emissions being out of allowed levels.

Edit:- hopefully you have just picked them up wrong and it is the pre car probe that is forcing this over fuelling.

Yeah fingers crossed. I cant remember exactly which sensor they said was doing what, just that one was asking for 5% and one for 100%.