Looking at your symptons, I would say the injector is more likely to be the problem .

Cant be of specific help, since I have no personal experience of 21st century cars, and don't want any, but I do know that a lot of garages with experience of 21st century cars don't know what they are doing with them.

The tendency is to change whatever reports the error, though the fault may lie elsewhere.

The Honda Accord I was running recently was reporting insufficient EGR flow, and "therefore" had been fitted with a shiny new EGR valve, which hadn't fixed it. This was unsurprising since the EGR path was completely clogged with soot.

In one of the recent South Main Auto video's, he investigates a Jeep that, IIRC had been recently fitted with 4 new injectors and an EGR valve, but continued to report faults. These components shared a common earth. The earth was bad.

I'd say you either (a) need to find someone who actually does diagnostics (though I dunno how you do that) or (b) find someone who specialises in your make, who may have seen the problem before.

I suppose another option would be to post on a Ford (Transit?) Owners Forum, where, if they cant diagnose themselves, they might be able recommend someone.

Edited by edlithgow on 27/05/2021 at 04:26