6 cylinders. Big
AO Silver Member
Join Date: Jun 2009
Location: United Kingdom
County: West Midlands
Mine went into Limp Mode with the EML on as I drove to Torquay on Friday.
Was fine on the straight, but as soon as I asked for power, nothing.
I had a long chat with John at SimplyAlfa on the journey, he explained it as follows:
As the car had sat for a week doing nothing (wheels refurbed, bonnet/bumper respray) the ECU started a regen as the car was warm and at constant revs. Part way through this process the electrical connector that the ECU uses to judge the state of the DPF failed/broke. He said that this is very common as the pipe/wire used is rubber, and when subjected the the massive heat of a regen, it melts/fails! Great bit of design eh?! He advised that once the engine is switched off, the Limp Mode will reset, but will then kick in again when the engine is put under load, due to the fault in the DPF circuit, the ECU shuts things down to protect the engine.
I will drop in to him some point this week to get a diagnostic test done, see what actually is the fault and see if I want it repaired! Depends on cost....
However, after 150 miles of this, the power returned! The EML is still on, but the car pulls like a train again. Odd. I did notice a smell of exhaust gas as I had the car at 4K revs, and the mpg dropped like a stone, so I think it may have done a regen at this point.
Drove to work this morning, Check Engine came up, EML on, still normal power.
So it is worth getting a second opinion before spending loads on a new DPF/EGR. A simple sensor may actually be the fault as apposed to the whole unit.
Wish I could afford to run a V6.......
Moved over to the dark side
And loving it