EGR valve insufficient flow

Hi all

I took my car to audi to get a diagnostic check done came back as egr valve insufficient flow.
Bought a new siemens EGR valve and I am Still getting the same fault code
The pipe feeding the egr valve has slight oily/sooty coating on the inside which can be wiped off with your finger. No blockages in the pipe.

What else could cause this fault?


2005 Audi A4 2.0Tdi

Whats the history behind taking I to main dealers for a code read?

if it's the siemens electric valve rather than the vacuum operated i think you need to use 'adaptations' in VCDS to set it up. I could be wrong though.

Thanks for the replies

I replaced electric valve with electric valve.

Exhaust Gas Recirculation (EGR) Valve Adaptation - Ross-Tech Wiki

having said that - some folks here seem to not need adaptation
https://www.vwaudiforum.co.uk/forum/s...0TDi-(170)-BRD

Thanks for the reply

How do you test the egr cooler is working as there is a actuator mounted on the end of it?

Presume you mean the EGR valve having an actuator on the end of it? - you need VCDS and use 'measuring blocks' to check it's functioning. Maybe you need to take it to a garage to get it checked / set up.

Thanks for the reply

On the end of the egr cooler there is a actuator to direct the exhaust gasses through the cooler when required.
How do you test if it's working

Attachment 31488

A vac pump,see if it holds closed and follow the hose back check for splits.

Thanks for the reply.

I'll check it and report back.