2018 SKODA OCTAVIA mk3 1.6 TDI DDYA engine.

Couldn't pull the skin off a rice pudding. Started with intermittent glow plug with no error codes. Now flashing glow plug light with permanent EML which won't reset.

 

So my octavia has had the EGR valve checked and it's free, works and is clean. The EGR duty a is showing as 27.1 requested, Actual 0, error -100%

EGR duty B is 0, actual 0 and error 0.

 

Anyone got any ideas how far down this rabbit hole i need to go?

You say its free and it works, on what basis do you say that because your measuring block data (presumably VCDS) is contrary to that.

 

Have you tried driving the EGR valve through Output Tests and seeing if it does move when driven from the motor?

 

Doing that while looking at the position sensor data should tell you if the internal gears are stripped or there is a problem with the potentiometer.

 

I cant recall if the stripped gears cause the valve to not move or perhaps the potentiometer to not reflect the movement.

The garage it's in has tested it and said its in perfect working order and it my be an issue with electrics 

I would not have a lot of faith in them with that conclusion from the contradictory information they have provided.

 

But as always as soon as you engage someone else to do the work on your vehicle you can do little but look on with frustration, its all the worse when you can see how things are going.

Would replacing the sensor make a difference? Is it a short in the wiring elsewhere. At this point  I'm really at a loss

Like all these faults, we really need output from VCDS / ODBEleven for us to comment further.  It could be a failed EGR valve or it could be an electrical fault for the actuator.