Engine: D5: Limp mode after warm up, DPF reg and fuel filter changed

[Appletree]

Hi,

This is a post for my dad as he'g gone away for abit and i'm trying to sort his car out for him.

Its a 55plate V70 D% 185 mannual with around 55k miles onthe clock.

He only uses it for a short run day to day but if he notices a reg (Big MPG drop) he'll carry on driving till the MPG goes back up.

Any way few days ago the orange triangle came on in the middle of the dash and he got the "engine system service required". this fault would clear if the car was left for a day but would return as soon as the car got to the 2nd mark on the temp gauge (car warm enough to start a regen).

We suspected DPF could be the issue and also as it was due a Fuel filter got it booked in to lincoln Volvo.

I dropped the car off yesterday for him and on the drive over as alway the car went in to limp mode when the the temp gauge rose but this time the "engine" light came on in the right corner of the cluster.

I continued to drive over at 50mph ish with no turbo untill i had to over take a tractor. During the over take i held 3rd up to 3.5krpm ( still with no turbo) and then when i went to grab 4th i had full boost back! untill i dropped below 2krpm again? the "engine light" never went out.

The car went back in to limp mode again at the next traffic lights but again after if i revved and then let the revs drop alittle or used engine braking over 3krpm the next time i pressed the throttle i had full boost again till the revs dropped again.

Volvo tryied a new DPF pressure differencial sensor and found it did not change the problem so refitted the old one. they then did a feul filter change and did the DPF reg and read the codes.

they said there weren't any codes that would be an issue but did say the "regeration counter" was very high to reset it to zero again.

Picked the car up last night and seamed to be ok all the way home apart from seaming to go in to regen mode so it went for a run up the A1 and came home all working well.

This morning though its gone back in to limp mode with the "engine system service required message"

Does this sounnd like a vacume issue?? the engine braking/higher revs causing more vacume? or maybe a solinoid issue or the flap linkage braking on the manifold.

Any help or if you have had simular problems and can advise the fix would be much appreicated.

Thanks Matt

[Appletree]

Sorry mods, i was just trying to change the title, please delete this thread.