EGR valve and exhaust temperature sensors

[KerryT]

Vehicle = A5 3.0 Cabriolet (diesel)

Within the last 2 years I have had all 4 exhaust temperature sensors replaced, and about 2 months ago, the EGR valve (all genuine Audi parts). My engine management light has come on and it is reporting intermittent faults on (2 of the 4) exhaust temperature sensors and a fault on the EGR valve. 

I understand there is also an EGR cooler element to the EGR system; could that need replacing as well as the EGR valve itself? The fault is "4807 EGR System P0401 00 (232) - Insufficient Flow". The fault was cleared and I've just ran two tanks worth of fuel with a redex type additive (where possible, I ran the tanks using manual rather than the automatic gears and at higher revs (3000rpm ish)). As I'm coming towards the end of the second tank, the warning light has come on again. 

The car appears to be running fine (not running hot for example). Any ideas/suggestions?

 

[Steve Q]

Welcome to the forum Kerry, you'll find the members on here are a friendly and helpful bunch 🙂

when I worked at Volkswagen I found that the egr and egr cooler would be done together bas a matter of course as the last thing we wanted as an EML light to stay on. I'm surprised you weren't offered to have them done together when when you had the egr done. 

cheers

Steve

[KerryT]

Thanks for the reply Steve. When I spoke to TPS, they said when you buy the EGR cooler, it comes with an EGR. Does that mean I'll in effect, be left with a 'spare' EGR if I buy the EGR cooler from them, or can you just buy the cooler component on it's own from somewhere? Forgive me if this is a stupid question.....