103kW/125kw TDI PD Piezo Siemens injector failure thread

[Greg Roles]

Hey all,

There's growing evidence that the Siemens injectors fitted to the MKV 125kw engines are starting to fail across the board. Seems to affect the Passat mostly, but as this is basically a GT TDI engine with a counter shaft balancer, the injectors are the same. It seems to be the pizeo portion of the injector that fails, and VW are very aware of the problem and offering revised injectors at exchange with your old ones. I'd like to start a thread to both record the numbers of actual failures, and to inform of any options / fixes as they come to light. I'm doing a lot of research into it, as heck, mine could go at any time, and I'm wondering if I even bother with extended warranty given how modded my engine is starting to look, let alone what it'll look like this year when the big stuff finally happens.

Here's the first of a few interesting articles I've found, but across the world, there are people from Skoda, VW, Seat and even Audi up in arms about the issue. No doubt aftermarket injectors will come, and given the cost VW will no doubt charge, it's the way I'd go. At this stage all I've been able to find is they cost $400ish pound EACH in the UK, love to know what the going price is here.

https://sites.google.com/site/1810ma...iezo-injectors

Also interested if anyone can tell me why the swapout with warranty cars seems to also include the wiring harness - is it different, or just worth doing while you're in there?

[Greg Roles]

One of many forums reporting on the problem. The GREAt news is there's a link to a UK company that can repair the Siemens. I've sent them an e-mail and will let you know what they say.

UKpassats.co.uk • View topic - Faulty diesel injector?

and the company link....

AP Diesels Ltd - Home

[nutttr]

According to the ukpassats link they may be going to ground when they fail - Depending on the voltage/current/wire guage, etc, going to ground may be damaging the wiring, hence swapping it out. It's crazy they are that expensive though and i'm sure it's only a matter of time before they find a way to retrofit different injectors...

[Transporter]

My 2c.

https://sites.google.com/site/1810ma...iezo-injectors

[gldgti]

thats a great link transporter, thanks!

[kaanage]

desertstorm linked to it in the thread linked in the 2nd post by CogDoc.

One of the Passat owners, here, with a 103kW TDi posted that he also had the same failure, though, and I thought those didn't use the piezo-electric controlled injectors

[poyta]

No doubt aftermarket injectors will come, and given the cost VW will no doubt charge, it's the way I'd go. At this stage all I've been able to find is they cost $400ish pound EACH in the UK, love to know what the going price is here.

Thats scary - especially considering my warranty has just finished.

[RobV]

Hi Greg,
Try $1500 per injector, and its the wiring loom that starts it all. The insulation hardens, cracks and falls apart, then shorts the injectors to ground, and hey prestor, $7500 worth of headache.
Rob V

[OilBurna]

mine was just over $4,000 to replace including loom.

[Greg Roles]

Hi Greg,
Try $1500 per injector, and its the wiring loom that starts it all. The insulation hardens, cracks and falls apart, then shorts the injectors to ground, and hey prestor, $7500 worth of headache.
Rob V

Wow now that's both scary, yet interesting. So perhaps if working looms could be better protected from oil and heat, the problem might be minimised....but it would seem both loom and injectors can fail as both are usually replaced at once on warranty claims.