Engine Check warning light

Is the light initially going out after they've fitted a new one? Is the garage fitting the correct OE spec sensor? A lot of pattern sensors, whether crank or lambda etc just don't last like a genuine  dealer supplied sensor does.

Sometimes you need to bite the bullet & let the dealer look.

As ED says,  Fiats often need specific software ( Multiecuscan) to reset things and your local garage may not have it.....

I have the orange Engine Warning light come on fairly frequently on my Ducato. 

The first time I was on my way to Cyrstal Palace and, whilst there, I called the AA. Their diagnostics reported a problem with the "Turbocharger boost pressure control position sensor". On my return, I took the van to Ford & Slater. They could find no fault.

It has happened a few times since, but after a stop and re-start the light goes out. It happened again on my last trip back from Chapel Lane. On my next re-start - no light!

Sorry, this does not help the OP, but just making the general point that, from what I was told, the engine warning light on Fiat Ducatos can be somewhat temperamental. 

How does it go Fix It Again Tomorrow

…..the engine warning light on Fiat Ducatos can be somewhat temperamental…..

I agree, seems to be more of an issue on later models. Diagnostic is not always helpful as logged ‘faults’ have a habit of fixing themselves requiring nothing more than a restart…. until the next time.

Have you checked all your fuses. 

I heard some electrical functions piggy back on other circuits. So for example if reversing light fuse is blown it can cause spurious other warnings to pop up. 

I'm no expert but I think I read this on another MH forum.

Good Luck

If the engine management light is on, the the vehicle is telling you there's a fault which needs looking at. OP hasn't told us yet whether the new sensors have fixed it for a while & then come back on again or not. As the garage has used a lap top, it suggests they are using generic code reading software .... as above, it might need the proper Fiat diagnostic reader

Here's the post from the "motorhome fun" forum...

Now this is interesting and maybe can save a few folk many hundreds of pounds.

I'm here at the Peterborough Show and decided to have the engine remapped by Quantum, who have a stand here. Whilst he was doing his thing I just happened to mention the weird solution to the engine warning light fault - and he said, yes, that's quite correct! Huh?

Turns out that the power supply to the MAF sensor comes from the reversing light circuit! He discovered this whilst trying to find a sensor fault, found a blown fuse and the fault went away. But not content with just "finding" it, he actually investigated the wiring to discover this seemingly absurd fact! On the vehicle he was checking, chafing had caused the wires to short where the harness came out of the chassis extension, blowing the fuse.

So to anyone who is having this fault show up on the diagnostics, do a check for blown fuses first - ANY blown fuse. You may very well save yourselves many hundreds of pounds by "experienced" technicians just replacing expensive parts - "'cos that's what the computer says".

 So I didn't imagine it.

had similar problem on my OH's Kia Carens, narrowed the fault down to the exhaust gas regulator, £500 fix car runs as new. Mechanic told me the Engine management system monitors a range of different aspects, fault light can come on if you have a badly fitting fuel cap, something to do with pressure in the fule tank,

I had a similar fault with an old Astra G, it was rear brake light bulbs failed, so yes DME faults vary drastically