I have this fault code , EPC Light the car runs fine and feels ok , noticed fuel consumption down , any ideas before I start chucking cash under the bonnet 

23 minutes ago, Andrew245 said:

I have this fault code , EPC Light the car runs fine and feels ok , noticed fuel consumption down , any ideas before I start chucking cash under the bonnet 

The wastegate position according to position sensor,  is not where the ecu asked it to be.

 

It could be a number of alternatives…

 

• wastegate carboned up and not moving freely;
• wastegate actuator servo motor faulty;
• wastegate itself worn bushings excessive free play causing it to be out of adjustment - see next point.
• wastegate needs upper and lower limits adaption re setup but this is likely due to worn wastegate which may need new turbo (or wastegate rebushed).

 

for starters you could try and move the actuator rod with the engine off and see if it moves back and forth ok. This in itself may make the code stay away for a while if cleared, but it may come back, if one of the other causes underlies it.

 

how many miles on the car?

 

 

 

The wastegate actuator to arm pivot seizes up..the actuator needs removing & the pivot needs sanding & re-greasing...

 

This is for a 1.4lt EA211 engine, but the basic principal applies...

 

How to fix the turbo wastegate rattle on the Mk7 Golf 1.4lt TSI (140/150PS) | GOLFMK7 - VW GTI MKVII Forum / VW Golf R Forum / VW Golf MKVII Forum

The car has 84k , waste gate free and easy , car pulls boost   ok , feels fine , fuel economy down in the 20s ???? 

2018 PLT 245 VRS no DPF , 

13 hours ago, Andrew245 said:

2018 PLT 245 VRS no DPF , 

You could replace the actuator speculatively. Or do some boost logging. If the servo is faulty it should be showing on specified vs actual boost. 

 

When you move the actuator rod. Does it feel like there is play in the wastegate? It would be a lot easier to assess with the rod disconnected..

 

You could also try to do basic settings on the turbo actuator, see if it completed. If not, try to adjust and retry.  

Edited 12 December, 20232 yr by TheClient

Ok thanks for that , I've logged the boost and it pulls 1.8bar , ok car feels normal , I'll try the rod again , last time felt free , not sure why the fuel has dropped , fitted new MAP sensor , no difference 

16 hours ago, Andrew245 said:

Ok thanks for that , I've logged the boost and it pulls 1.8bar , ok car feels normal , I'll try the rod again , last time felt free , not sure why the fuel has dropped , fitted new MAP sensor , no difference 

Yes OK, sure.  But, what I would say, is the boost profile in general driving may  needs to be compared actual to specified.

 

An actuator fault could easily result in boost being above specified, or lagging in response to decreased boost specification. That could explain the higher consumption. In summary- with such a fault, it may not necessarily be peak boost that is a problem. It may be responsiveness to changed boost pressure requirements called for by the ecu on and off throttle, part throttle, increased load up hill. Etc etc.. 

 

Although, if it is far enough out, usually the ecu will log a boost out of specification upper or lower threshold fault. .. 

Ok got you , thanks 

Good old TSI engines.  Gotta love 'em.  Yes, the turbo vanes get stuck and the car will go in limp-home/fail-safe mode.

 

Solutions:  1) Work the vanes on the actuator, open and closed by hand.  2) Take the car on an Italian Tune-up....VW products don't appreciate being driven lightly.  3) Its about a £300-400 if you need to get the vanes replaced.