Thread: D4 Performance Restricted

Ok so I have noticed something else interesting, it appears my faults could be affected by ambient temperature, I do most of my driving at night, when the temp is below 30c outside, "Performance Restricted" occurs regularly. However, during the day, with temps above 30c, no matter how I drive, whether like a granny or really working both the turbos, nothing. It's perfectly fine. Does this point further towards the solenoid? Surely if I was in more major trouble and in need of a turbo replacement/replacements I would see other issues? Lack of performance before errors occur, smoke, weird noises etc etc?

Also, I'm not sure if I've mentioned this, but I never have had any smoke at all, if that helps this mystery at all.

Improper electrical connections can be affected differently for different temperatures. Has the earlier fault indicating a failed valve circuit re-occurred?

The part is LR021929 and costs about 20GBP in the UK.

A quote from a Disco3.co.uk thread: recommend you D4 owners get a spare one as this is what can kill your secondary turbos if it gets sticky!!

Smoke or lack thereof would not be conclusive especially if the engine operates correctly often enough to not allow any build-up of oil.

I also recently had the restricted performance light come on on my D4 TD2.7. At first it was only every now and then but soon happened a few minutes after starting. It never went into limp mode but steadily I got more and more black smoke billowing from the exhaust whenever I accelerated. Great way to make the tailgaters back off mind you.

Culprit was a split turbo intercooler hose that goes into the inlet manifold. Split was around 2" long. As a temporary measure I cleaned it with alcohol, glued the split with Loctite instant adhesive and put some duct tape over for good measure. Instantly the Restricted Performance code was gone and no more smoke.

This may not be your fault which I hope you track down but it might help others.