FL2 TD4: Reduced Engine Performance

Hi all.
Wife driving and got this message and running like limp mode. Any thoughts, please?

A lot more information is needed before anyone can even guess as to the fault.

OK, not sure what else I can offer as I don't have a code reader. It happened during a drive and I can't see any leaks, etc.
What other info can I provide, please? I am (obviously) keen to provide all that I can!

Buel10 said:

What other info can I provide,

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Engine and year would be helpful, also was it filled with fuel recently?
Is there any smoke or unusual noises?
Have you checked the boost hoses for signs of leaking or holes?

Thank you!
Engine and year would be helpful, also was it filled with fuel recently? 2010/11 (60 reg) Filled up to half tank four days ago and has been running fine up until today?
Is there any smoke or unusual noises? Nope
Have you checked the boost hoses for signs of leaking or holes? No, not sure where to start but can Google unless you have some tips?

Did the screen on the dash show any messages?
Is the problem there all the time, or has it cleared after a restart?
Is the MIL on?

Next would be a proper diagnostics read. These are complicated vehicles, so codes logged will be helpful in pinpointing a possible cause.
If you have an android phone or tablet, you can buy a cheap (under £10) Bluetooth OBD2 dongle for the port on the vehicle, and get an App like Torque to read any codes from the ECM. I keep one in all of my cars, just in case.

Did the screen on the dash show any messages? Only that it is in Reduced Engine Performance
Is the problem there all the time, or has it cleared after a restart? All the time, after several restarts.
Is the MIL on? Not sure what this is, please?

If you have an android phone or tablet, you can buy a cheap (under £10) Bluetooth OBD2 dongle for the port on the vehicle, and get an App like Torque to read any codes from the ECM. I keep one in all of my cars, just in case.
I have a Windows 10 laptop. I will try this, thank you!!

Ok, so it's a 0.5 facelift model, useful to know.
If the message comes up straight away before starting, then the ECM is detecting an issue with a senior.
So in this instance you can discount the boost hoses, as that would only be detected after the engine is running under boost.
So I'd be looking for wiring issues or loose plugs on any of the sensors, or even an injector.
The sensors to check are the crank sensor, cam sensor, rail sensor, MAP sensor, MAF sensor, fuel temp sensor and the throttle body position sensor. Oh and if it has a DPF, it's worth checking the sensors for that too.
If that doesn't identify anything loose, then it'll need an OBD2 diagnostic read to get the code causing the issue.

Thank you again!
If you have an android phone or tablet, you can buy a cheap (under £10) Bluetooth OBD2 dongle for the port on the vehicle, and get an App like Torque to read any codes from the ECM. I keep one in all of my cars, just in case.
Will this be sufficient for checking those sensors you mention, please?

Buel10 said:

Will this be sufficient for checking those sensors you mention, please?

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Torque (lite is free, pro is paid for) or other Apps will pull all engine codes and live data when used with a Bluetooth ELM327 dongle, which can be bought next day delivery on Amazon for under £10.

Does the fault limit the engine revs?

Does the fault limit the engine revs?
Yes it does. Also, it stalled this morning after starting up in neutral? Never happened before to me. Once I got going, after a sluggish start, it was back to reduced engine performance......hopefully getting the codes read later!

The results are in....

Can't seem to post the image?

You put share links up. To get pictures up it needs to have .jpg at the end of a picture link.

Update: Got a friend to clear the codes last Monday and it is running well since?

Overboost condition is normally caused by a sticky turbo actuator or vanes. If it's the vanes, then using the vehicle will normally free them. If it's the actuator, it normally gets worse with time.

The missing data from the immobiliser is normally caused by starting the engine before the system check has completed.