Hi everyone

I have an A6 2.0 tdi 2005 with BLB engine.
When accelerating through the gears, initially there is no boost, then at some point the turbo kicks in giving full power. There is no pattern, it could be after a couple of seconds in 2nd gear or a few minutes later in 5th.

I have a few error codes from a Snap On scanner;
01262 solenoid valve for boost pressure control N75 could be short to ground, short to plus, or output open or faulty valve
16786 EGR excessive flow.

Before I fit a new N75 can anyone tell me how to check the wiring to the valve with a multimeter or what reading I should get at the connector. I don't want to fry the new valve if the loom is faulty

Don't really understand why the problem is intermittent . Any help or advice gratefully received.

Thanks

 

I have had the power given by the turbo cut out and now the engine runs but has no boost. Had the AA out to check it and they have said it could be a sensor that is affecting the engine management system and not letting the turbo kick in. He said that the turbo was working as it could be heard when the engine was revved.
Anyone got any advice on this one, or is it a problem that someone has encountered?
I am looking for an alternative to spending over £1000 on a replacement.