Could be a duff sensor

 

I've found things like this are caused by removing a connector (even though the ignition is switched off).
The car has detected this and flagged up a fault but it should run normally as the "fault" is no longer there.
Usually disappears after 3 or 4 start ups.
The way to stop it is to disconnect the battery whenever a connector is to be removed.

 

Started it up about 10 times since disconnecting yesterday and it still showing up. I cant understand why cleaning the other parts would throw up this fault. I drove 27 miles 72mph @ 3000 revs in 4th gear to try and force a regen and the light stayed off but as soon as I hit traffic it came on and the car felt lumpy and there was like a hiccup before it came on. Ive disconnected the lead to the sensor and the car seems to be running a bit better so will probably replace the part and see if it helps.

Why does the car run better with it disconnected other than the technical sh*t that the spec says the part does why do you need it if it runs ok without it lol???

 

That code is a fault with maf wiring either it got damaged when you removed other sensors, or you may have dislodged something which has damaged sensor.

It will run without it connected as ecu will calculate a default air mass based on other settings like boost and rpm etc and it disables EGR as it cannot calculate the correct EGR %.

You may find a slight increase in fuel use and slight lag in boost with no MAF

 

Thanks for all your input, after reading more on this part and likely hood of it failing it describes my car to a tee apart from the mpg (i'm getting 50+) ive decided to buy another and see where I go from there, hopefully this will solve it all. To be continued....... (if I'm unlucky )

 

Inside the MAF is a tiny hair-thin sensor ( one of 3 inside, I think ) , easily damaged when cleaning it - spray cleaner from a distance work best :thumb:

 

I didn't touch the maf itself, I only cleaned the other 2 sensors (map & air intake), I only removed the maf (still intact with the lid) to clean inside the airbox, that's why I'm baffled its thrown a fault with that part.

 

Okay, sorry I misunderstood.

Was the airbox dry before starting the engine?

 

Yeah, I didn't use any fluids to clean it, just tapped the lower half on the floor to clear the dust/dirt from it.

 

Fitted a new Maf sensor along with a new air filter and although the car seems to be driving ok the light still keeps coming on even when ive reset it (about 5 times now),

 

Hi mate, how did you get on with the injector fault? I can come back round and see what's causing the light to stay lit up if you want?

 

Hey up, not done anything with that. I was told it me be an old fault from before I bought it (there was a receipt for a new injector when I bought the car) so I started looking at other parts that could have been causing the lumpiness. Did you fully delete the codes your machine picked up?

 

Yes, they were deleted. I remember I said I'd come back and get some live readings for the injector, so if it something you still want/need, then let me know.

 

Cheers, yeah it might be worth a look. Let me know when your free.

 

No worries, I'll be busy most of this week, so it may be next week. I'll be in touch nearer the time