05-11-2013, 10:30 PM
The maf sensor can trigger the engine light, but only on the very early hdi's and only if you unplug the maf. I'd be very surprised if this was maf related.
As andywhy says - revs limited to 2.5k is limp mode. It won't shut down the turbo as the turbo on these isn't ecu-controlled, but it will cut the fuelling to the point where the turbo won't make any boost.
Clogged fuel filter can cause this issue, would definitely make that my first port of call if your uncle isn't a fan of regular servicing. As deeturbo says, limp mode on these is usually caused by fuelling issues.
As andywhy says - revs limited to 2.5k is limp mode. It won't shut down the turbo as the turbo on these isn't ecu-controlled, but it will cut the fuelling to the point where the turbo won't make any boost.
Clogged fuel filter can cause this issue, would definitely make that my first port of call if your uncle isn't a fan of regular servicing. As deeturbo says, limp mode on these is usually caused by fuelling issues.