Question: does the local main dealer have better diagnostic kit than the garage down the road? Does the Ford kit run more checks, or have access to other information that hasn't made it into the after-market test kit, or a £20 OBD2 scanner?
The reason I ask is that my 2014 Trend (155hp 2.2D TDCi) went into limp mode a couple of times on my last long trip in the summer. It was Ok after stopping for 10 or 20 minutes. I took it to the local garage when I got back, but their kit didn't show anything. They said the test kit at the Ford main dealer was better, and they might be able to get a code out of it. It was Ok at the time, so I left it.
I've done about 50 miles/week since then, and for the past couple of weeks the service light has come on a few minutes after starting, but then goes out. So, do I spend the money and get the dealer to do a check, or take it back to the local garage, or buy my own scanner?