Cambelt and service done recently.

Since the work, the EML comes on pretty much on any light-throttle cruising run, where it never did before. Car appears to drive fine for the most part, though idle can be quite lumpy, sometimes when hot or sometimes when cold, but it's not all the time. Final symptom is that the trip computer is now even more wildly optomistic on average MPG: I drove from North Wales to Bolton the other evening, and it confidentely claimed I'd averaged 80MPG! Actual fuel consumption appears about the same as before.

It has had the BLT stutter gasket fitted previously, but that was about 9 months ago, and the EML light never came on in all that time, despite quite a bit of mileage.

I haven't managed to get it back to the garage yet, but wondered how a cambelt and/or service could change how the car behaves? EML I'm 99% sure will be related to EGR, but is the EGR system affected/taken off when doing the cambelt? Any other ideas? Car was perfect before, so I'm a little confused as to what's gone wrong. The garage have always done brilliant work before, on all 4 of my last cars.

Ta in advance.

I could be talking pish but it sounds like theyve messed up the timing

I could be talking pish but it sounds like theyve messed up the timing

That was my initial thought, and obviously the first port of call when I drop it back, but they don't usually make such simple errors. Would be handy to know if anyone else has come across this issue.