MajorCommonEngine

Audi A5: 3.0 V6 TDI (CAPA/CDUC/CLAB) EGR Valve and Cooler Clogging — Insufficient Flow (8T)

3.0 V6 TDI (CAPA/CDUC/CLAB) EGR Valve and Cooler Clogging — Insufficient Flow (8T) is a common engine fault on the Audi A5 on the 2008–2016 cars, and we rate it major. Putting it right costs $900 to $3,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 25 documented faults on the Audi A5.

Vehicle: Audi A5
Engine: 3.0L
Years: 2008–2016
Fuel: diesel
System: Engine

This page covers the Audi A5 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Audi A5 faults25 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the EGR valve yet. We would rather show none than show a picture of a different part.

What goes wrong

The 3.0 V6 TDI's exhaust-gas-recirculation circuit soots up with age and town use: the valve sticks, the cooler's passages choke, and the engine logs 'EGR insufficient flow' faults, lights the warning lamp, and can cut to reduced power. A5 owners chasing exactly this on diagnostic forums find everything from a valve that frees up with cleaning to coolers that must be replaced, and on the V6 the parts live deep in a crowded engine bay so labour dominates the bill. A car that has spent years on short urban runs is far more likely to be affected than a motorway cruiser.

What you would notice

Engine warning light with reduced power that a restart clears
Hesitation or uneven running at light throttle around town
Repeated warning-light returns after resets
Rough idle when warm

How to check it

Where to look. EGR valve and cooler nestled between the cylinder banks and bulkhead side of the V6, under the engine cover

Watch the dash through a cold start and a full test drive that includes both town speeds and a firm open-road run — an engine light that arrives under light town running, or power that falls away and returns after a restart, points at a starved EGR circuit. Ask whether the light has been on before, what was diagnosed, and whether the EGR valve or cooler has been cleaned or replaced, with invoices. Treat a freshly cleared warning light with no paperwork as a red flag and ask for time to have the fault memory read. If a workshop inspection is possible: have the EGR commanded-versus-actual flow compared with diagnostic software and the valve and cooler inspected for packed soot before pricing the repair.

Parts involved: EGR valve.

What it costs to put right

$900 to $3,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the engine light ever come on with an EGR or flow-related fault?”
“Has the EGR valve or cooler been cleaned or replaced, and is there an invoice?”
“Is the car mostly town-driven or open-road driven?”

Now check the Audi A5 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

Ross-Tech Forums thread 'AUDI A5 COUPE QUATTRO 3.0 V6 TDI egr issues'
Ross-Tech Forums thread 'Audi A5 3.0TDI 2010 - EGR insufficient flow and regeneration?'
Audi-Sport.net thread 'A5 3.0 TDi EGR'

Audi A5 buyer questions

Is 3.0 v6 tdi (capa/cduc/clab) egr valve and cooler clogging — insufficient flow (8t) serious on a Audi A5?

We rate it major and common on the Audi A5. The 3.0 V6 TDI's exhaust-gas-recirculation circuit soots up with age and town use: the valve sticks, the cooler's passages choke, and the engine logs 'EGR insufficient flow' faults, lights the warning lamp, and can cut to reduced power. A5 owners chasing exactly this on diagnostic forums find everything from a valve that frees up with cleaning to coolers that must be replaced, and on the V6 the parts live deep in a crowded engine bay so labour dominates the bill. A car that has spent years on short urban runs is far more likely to be affected than a motorway cruiser.

How much does it cost to fix on a Audi A5?

$900 to $3,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Audi A5 years are affected?

Our research records this fault on the 2008–2016 Audi A5. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.