17964

[Trislander]

Right code17964 low pressure turbo related I've read lots of different threads with lots of different remedies which is confusing me so could anyone who has/had this fault and cured it please advise what is the best way of dealing with it. I'm ready to send an old knackered turbo off for recon but don't want to spend loads if I can avoid it. I've read about spilt pipes faulty maf sensors etc

My mark 2 1.9 tdi x reg is really down on power it's got a 52 plate PD engine in it which is 90 bhp

It goes into limp mode at roughly 2000 rmp or above I'm lucky to get 65 mph on level roads any more pressure causes limp mode

Up hill is just a joke I've got 40 tonners laughing at me lol

So please please please helpppppp

[Trislander]

17964 charge pressure control negative deviation p1556 static no indication on display

[seatkid]

Could be a number of reasons, but usually sticky/faulty vane actuator in the turbo is a favourite. Can sometimes be fixed by physically exercising the actuator c/w lubrication, or better if stripped and cleaned, but not guaranteed.

 

Other reasons are leaky vacuum pipes/accumulator, faulty fuel temp sensor, faulty MAP sensor, leaking boost pipework/intercooler, N75 valve to name just some.

 

Oh.... and dont forget to check if your airfilter is bunged up with dirt.

[Trislander]

Easy then? Lol

[xavier]

appreciate this was from a wee while ago, but have you taken it for a drive and used vag com to log the data from the ECU? this can then be used to plot a graph that can help diagnose the cause of the problem.

[jipninty]

had the same problem it turned out to be a small vaccum pipe in the engine managment box.

its behind the speedo

[Trislander]

I shall look into it

[Trislander]

Actually just looking at a different turbo now and going to hope for the best managed to get a scrap one I know it's not ideal but can only go with the funds I have I'm really crossing my fingers and hoping it cures the limp mode

[xavier]

I innotec'd mine. It didn't cure it completly but helped. Previously it'd only limp if I went to high revs, then started limping when above 2.2K. Also noticed it a lot smellier when starting and fuel econ was way down. Anyway, what I'd suggest is remove the undertray so you can get a 14mm spanner on the actuator arm of the turbo and see if you can move it. Mine was siezed solid. The innotec freed it up and got it working again, not great and it really needs a clean (and probably could do with things like oil pipe getting replaced) but gave me some time. Going to see how much a mobile mech would charge to remove then refit the turbo for me, I'll try cleaning it myself though.

[Trislander]

Mines the same goes into limp mode at 2200rpm

Mate is replacing turbo this weekend so fingers crossed

[xavier]

Have a look at it when it comes off (remember to cover the oil pathways, don't want anything falling in there). check for play in the bearing and any marks on the intake. you might find it's ok and just needs a clean.