Service Engine Soon light will not go away

[Smartbear]

The ECU has a stock map for fuelling, if you have rough running and disconnect a suspect MAFF and it runs fine, that suggests that input signals from the knackered MAFF are the likely cause ........... or so I have read on here previously

I know this, that’s why i asked the op how it ran with the suspect maf disconnected :wink:
Rob

Ahhh "how (well) does it run disconnected", rather than "how does it run when disconnected" (as in how is it able to) :rofl:

That’s the one
Rob

 

[magicman]

this could be stretch but maybe a leaking injector, might not be seating properly. Do you have any trouble starting? or if you have a fuel gauge, hook it up and see if the rail holds pressure

 

[fernando306]

I haven't yet read the MAF, but I've replaced it and drove off, immediately noticed better response at low RPM and that the throttle response seems more even. It might just have done the trick! I'll report back later with the values and fuel trims.