D5254T (to 2002, Audi) 'Engine service required' and limp mode - again

[66split]

Hello all. I need some help please as I really
am coming to the end of my patience with
these problems.
Car is a 2000 - newer shape one, V70 2.5D.
Following other issues before Christmas with
limp mode etc, had a new MAF sensor fitted
and the cars been ok. Then, on Motorway
last night, slow lane, doing 65mph ish the
car went into limp mode and got the
"engine system fix next service" warning -
which I've seen before - and also "engine
service required" - which I haven't seen
before. The car was running beautifully, no
problems prior to these coming on. Limped
home and left the car overnight.
Started the car this morning, started easy as
it always does, still both the messages and
limp mode. In the past, when the car went
into limp mode, turning it off would
temporarily clear it...not so this time.
The car is going in to the garage on Mon so
will get codes etc read then but in the
meantime, does anyone have any clue what
is going on with it? Are those two messages
just the same thing worded differently? Why
do I have both of them at once? The car was
only serviced two weeks ago so I assume it
can't be that.
I have been looking at getting the Turbo reconditioned as the fellow who looks after it said it was getting a bit lazy but from what I've read, a boost leak won't cause limp mode, rather overboosting will - which I'm sure it wasn't.
It just seems like these
computerised vehicles are more trouble than
they're worth. The thing never seems to
work for more than a couple of weeks
without having some sort of computer led
freak out. I'm lost.

[Unreal master tech]

Hi mate it old be a number of things once the codes are got you should have a clue as to where the problem lies?! But the it's interesting the recycling the ignition does not change it? That indicates the the ECM is picking up the fault straight away without the engine being loaded ie turbo boost being incorrect. Could just be low fuel pressure or a sensor issue either way I hope it's an easy fix?! It could even be the intercooler hose has just blown off as the hose clips corrode over time and eventually they just blow off?!

[artiedtke]

Originally Posted by Unreal master tech

Hi mate it old be a number of things once the codes are got you should have a clue as to where the problem lies?! But the it's interesting the recycling the ignition does not change it? That indicates the the ECM is picking up the fault straight away without the engine being loaded ie turbo boost being incorrect. Could just be low fuel pressure or a sensor issue either way I hope it's an easy fix?! It could even be the intercooler hose has just blown off as the hose clips corrode over time and eventually they just blow off?!

+1 this. As per my reply to your other post in the General section, where was the replacement MAF from and when was the Fuel Filter last changed.

[Volvoref]

Car just been serviced after 'engine system service urgent , came up and car into limp mode clearing on restarting engine only to appear again . Since service was fine for a week then returned . Codes 2505 and 130A came up does this mean to change air flow meter ? What does first code indicate . Just got the car has 177,000 on clock good service history up to 100,000 am doing cambelt , water pump etc this weekend . Any ideas please any Volvo mechanic in nw London known with recommendation .

[Lancee]

Cheap MAF or original equipment fitted ??

[RobbieH]

If its ECM-2505 it points to low fuel pressure. My first guess would be fuel filter. When was it last changed?

130A appears to be air flow related (MAF) but I'd look at the fuel filter first.

How were these codes generated - Volvo system (Vadis/Vida) or something else?

[pgoldy]

I had similar with my 04 V70 D5. Limp mode after acceleration. Turned out to be the fuel filter. The one in the car had collapsed. New filter and all sorted!

Definitely start with that. £26 if I remember rightly, very cheap fix.