1.9dci help needed please

Hiya. :-) 15 months ago we had an issue with our 2006 Grand Scenic, came up with check emissions/check injector and went into limp mode. Took it to local garage who replaced EGR, MAF, Boost Sensor, problem went away and all was fine, a couple of weeks ago the car came up with check injector again, didn't go into limp mode, it lasted a week or so and went, same thing happened again immediately after refuelling, car back in limp mode, mechanic had a look, no error codes, air filter was cleaned and then glow plugs checked. After the air filter was cleaned the car then started stalking immediately after pressing start/stop, and only after 15-20 attempts, while having foot on gas it would start, glow plug checked, and replaced, starting issue still happening and dash now saying check emissions as well as check injector, could it be that the MAF sensor has been disturbed while doing the air filter clean? I initially thought it may be the DPF needing a clean after being in limp mode but that doesn't explain the starting issue (which only started happening after the air filter was looked at)



MOT due next week and want it sorted ASAP :-(