Seat Leon Turbo fault.

The message from "Keith Hampson" contains these words:

How do you know?

because I feel it cut out and I have very little power from then on.

Check the boost pressure sensor (in the trunking under the O/S/F wing), these are prone to getting moisture damaged.

The message from "Keith Hampson" contains these words:

Just wondered how you know it's the turbocharger instead of, say, the MAF meter.

Highly unlikely to be a turbo fault. What makes you think the turbo is 'cutting out' (It's not possible for a turbo to cut out, it is a simply device consisting of 2 fans, the only way for it to 'cut out' would be for it to seize, which is not an on-off thing, once its seized, its seized)

Sounds like the injection is going into limp mode for some reason. Most likely a faulty sensor of some kind.

I had a similar problem with my Fiat Bravo TD. This turned out to be the under bonnet sound proofing!!! At 60 - 70 mpg the sound proofing was being sucked down and over the air intake and starving the engine of air. Of course the garage that looked at it couldn't find the fault as they always looked at engines with the bonnet up!

Andy

Had it to seat today and they said it a faulty air flow meter and are replacing it.