6 cylinders. Big
AO Silver Member
Join Date: Jun 2009
Location: United Kingdom
County: West Midlands
Still sounds like a DPF or EGR issue to me.
John from SA explained it to me by saying that the original fault, in my case a faulty DPF regen, causes the computer to put the car in limp mode to prevent any possible damage to the engine and components.
The CEL will still show for several starts or journeys as the fault is still registered on the ECU.
Limp mode will be reset each time you turn the car on/off, but may then come back in as the ECU detects the original fault.
If the fault, as in my case, was a clogged DPF, then once the fault is cleared, in my case with a long slow journey up the M5 at 4K revs, then the limp mode will switch off.
After several more starts, the fault isn't seen by the ECU anymore, so it eventually switches off the CEL.
Exactly what happened to my 159 1.9jtdm.
Always worth getting it plugged in to make sure the fault isn't something that may occur again, or to give peace of mind.
Good news its working well again!
Moved over to the dark side
And loving it