Mk 6 Fiesta 1.6 TDCI - Limp Mode?

[dhutch]

We have a 58plate 90hp 1.6 diesel fiesta which has recent started occasionally suffering from reduced power.

- Struggles to accelerate at all above 60-70mph
- Will not rev above 3.5k rpm while being driven, or 4k under no load.

Typically key cycling it will clear the issue.

No warning lights at all, have not got a OBD reader.

Boost control actuator, control solenoid, sooted vanes, turbo underboost, split hoses, DPF wiring issues, etc have all be mentioned in past threads on here and FO Club forums.

Anything to look for other than getting a OBD reader on it?

[LeftLake]

It's tricky to diagnose from this description but (as far as I am aware) yours doesn't have a DPF as these were introduced in 2010 on the 95PS models. It's tricky to diagnose from this description and could be any of those things putting it in limp mode. It could also be something along the lines of injectors / fuel pump / fuel filter.

You might be lucky with an OBD reader and finding the faults, but really you want a decent one with live sensor readouts (something like forScan might be a cheap way of doing this).

[dhutch]

As an update, diagnosis was very low boost and a failed turbo.

£900 later, it's still doing it, apparently the boost is a bit low, might just be able to adjust waste gate but speaking with parts outlet before hand to ensure no issues.