EGR Problems

[Chriso]

Hi,

I have an intermittent EGR insufficient flow fault occurring on my 3.0TDI Avant, bringing on the check engine light. Been happening on and off (and by off, I mean often seemingly clearing itself and the check engine light) since 2022. No loss of power or any other symptoms. 

Decided to sort it last month by having a TerraClean carried out at my local approved centre. Two cleaning attempts (including cleaning the EGR cooler off the car) AND a new EGR valve and vacuum solenoid valve later, I'm still getting intermittent EGR insufficient flow faults occurring AND the check engine light comes on and goes off without clearing the fault.

Anyone experienced this before and have any idea what's causing this?

Thanks

Chris

 

 

 

[Steve Q]

That's odd it's not fixed the issue. After all that work my guess would be a sensor. You might need a more advanced diagnosis from Audi or similar. Was the egr replaced with an aftermarket one or genuine Audi? 

Is there a chance this or the solenoid could be faulty? 

[Chriso]

Hi, thanks for the reply.

I was thinking sensor too BUT what sensor, located where? I've not been able to find out what sensor is sending the insufficient flow fault message.

The EGR valve was a like for like replacement PIERBURG 7.02132.07.0 from Autodoc. I also replaced the solenoid with new off eBay.

I'm told by the geeks at Ross-Tech (VCDS people) that the check engine light can go off by itself after a few driving cycles. However, the latest twist in the saga is that the light came on 14th June, then went off by itself later that week, then came back on yesterday (23rd June) but when I scanned the car, the report said the fault that brought the light on was the one on 14th June, nothing for 23rd June.

It would be great if someone could tell me which sensor is reporting the insufficient flow.