P2155 injector fault and missfire help please

[Poveyrs4]

Hi new to this forum but in desperate need of some help I found a guy on here who had this fault tried contacting him but no luck.

The car dies when being driven hard has fault code p2155 supply voltage injector group d! I've also had miss fire cylinder 7,8

The Ecu was tested and found to be faulty so since been replaced by the dealer car ran fine for a week and now identical faults? No one seems to be able to fix it and it's driving me nuts I mean what's the point in a 4.2 rs4 when I can't boot it haha. Any help would be massively appreciated and hope somebody has had this fault and can tell me what I need to do.

Stuart

[Quattrors4]

Change your relays in the front driver side ecu box
Or you have a faulty injector or wire that is making a short

[Poveyrs4]

Thankyou have you ever come across this?

[Quattrors4]

Change your relays in the front driver side ecu box
Or you have a faulty injector or wire that is making a short

yes the relay caused it

[Avus RS4]

yes the relay caused it

Awesome!
Thank you for posting the results.
It seems as though every time I read some faults with our cars, that mine gets the same fault next.

[Poveyrs4]

Awesome!
Thank you for posting the results.
It seems as though every time I read some faults with our cars, that mine gets the same fault next.

I'm hoping it works trying new relays tomorrow! Are these the same faults as you've all had I've already had a new Ecu it's getting a bit pricey

[Poveyrs4]

Just took out relays I have 645 and then two 614 relays and there is also two smaller 395 relays can anybody tell me what they do and what ones I need to replace for my above problems I can't seem to find and information thanks

[Quattrors4]

Just took out relays I have 645 and then two 614 relays and there is also two smaller 395 relays can anybody tell me what they do and what ones I need to replace for my above problems I can't seem to find and information thanks

, replace both of the 614 for new ones
how do the relays look?some water coulded got inside

[Poveyrs4]

, replace both of the 614 for new ones
how do the relays look?some water coulded got inside

Thanks. They didn't look too bad was bone dry in the box yet when I pushed them they seem to click in better so maybe they are worn and not a great fit fingers crossed they solve my issue

[Quattrors4]

Yes they can be used enough to give a bad voltage

[Poveyrs4]

Well after replacing the relays as they did look a little burnt out! The car drives perfectly until taken above 6k in second gear! After the first few blasts it's was ok but on the third time off driving it hard in 2nd gear it then died the engine light flashes and same issues. Off to main dealer tomorrow but not much hope

[The_chadwick]

Well after replacing the relays as they did look a little burnt out! The car drives perfectly until taken above 6k in second gear! After the first few blasts it's was ok but on the third time off driving it hard in 2nd gear it then died the engine light flashes and same issues. Off to main dealer tomorrow but not much hope

I am currently having the same issue you did. We’re you ever able to get this fixed and if so what was the issue. Fingers crossed you even see this since this post is so old.


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