Common faults, service intervals and costs

Audi A6 (C6)

2004–2011

engines covered

known faults

35,155

roadworthiness tests in the statistics

official recalls

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The Audi A6 (C6) was built from 2004 to 2011.

For this generation we cover 5 engines and 27 known faults, each with the mileage range where it usually appears.

The most expensive known risk is Timing chain wear: it usually appears at 150,000–250,000 km and costs €3,000–5,000 to fix.

In UK roadworthiness tests in 2024, at 250+ thousand km this model most often failed on: lights, wipers and visibility (19.3 %), suspension (12.5 %), tyres and wheels (9.5 %). It fails less often than average on: brakes, suspension, steering, lights, wipers and visibility, body and corrosion.

Engines

Engine	Fuel	Timing drive	Oil
2.0 TDI PD (EA188, 8v / 16v)	Diesel	Belt · 120,000 km / every 60 mo	5W-30 · VW 507.00 / 505.01 · ~4.3 L · every 15,000 km
1.2 / 1.6 / 2.0 TDI CR (EA189)	Diesel	Belt · 180,000 km / every 120 mo	5W-30 · VW 507.00 · ~4.3 L · every 15,000 km
2.7 / 3.0 TDI V6	Diesel	Chain	5W-30 · VW 507.00 · ~6.0–8.0 L · every 15,000 km
2.0 FSI / TFSI (EA113)	Petrol	Belt · 120,000 km / every 72 mo	5W-30 / 5W-40 · VW 504.00 / 502.00 · ~4.6 L · every 10,000 km
1.8 / 2.0 TSI / TFSI (EA888)	Petrol	Chain	5W-30 / 5W-40 · VW 504.00 / 502.00 · ~4.6–5.7 L · every 15,000 km

Faults typical of this model

Front multi-link control arms

usually 80,000–160,000 km · Medium risk

Signs: Knocking, vague steering, uneven tyre wear

Fix: Replace the arm kit (8 arms)

€300–700

Instrument cluster / display pixels

usually 120,000–250,000 km · Wear part

Signs: Missing pixels in the display

Fix: Repair the cluster

€150–350

Faults by engine

2.0 TDI PD (EA188, 8v / 16v)

Cracked cylinder head (16v BKD / AZV)

usually 120,000–250,000 km · High risk

engine codes: BKD, AZV, BMN, BMR, BUY, BMA

Signs: Unexplained coolant loss, overheating, bubbles in the expansion tank

Fix: Pressure test; replace the cylinder head

€1,200–2,500

Camshaft and lifter wear (8v BMM / BMP / BKP)

usually 120,000–220,000 km · High risk

engine codes: BMM, BMP, BKP, BVE, BRT, BSY

Signs: Ticking, loss of power, metal in oil

Fix: Replace camshaft, rockers and lifters

€800–1,500

Oil pump hex drive shaft (balance-shaft engines)

usually 150,000–250,000 km · High risk

engine codes: BRE, BLB, BNA, BVA, BRD, BVF

Signs: Sudden oil pressure warning — mostly Audi A4 / A6 2.0 TDI

Fix: Replace the oil pump drive preventively

€700–1,500

Unit injectors

usually 150,000–250,000 km · Medium risk

Signs: Misfire, smoke, hard start

Fix: Test and replace injectors

€600–1,600

1.2 / 1.6 / 2.0 TDI CR (EA189)

EGR valve / cooler clogging

usually 100,000–200,000 km · Medium risk

Signs: Limp mode, loss of power, EGR fault codes

Fix: Clean or replace EGR valve; check cooler

€250–700

Emissions software recall

usually 0–300,000 km · Wear part

Signs: Affects 2009–2015 EA189 diesels

Fix: Confirm the emissions update was done (free at dealer)

free / recall

Timing belt tensioner and water pump

usually 150,000–210,000 km · High risk

Signs: Whine from belt area, coolant weep

Fix: Replace together with the belt kit

€450–800

Oil pump hex drive shaft (2.0 TDI with balance shafts)

usually 150,000–250,000 km · High risk

engine codes: CAGA, CAGB, CAGC, CAHA, CAHB, CGLA

Signs: Sudden loss of oil pressure — mostly Audi A4 / A5 / A6 / Q5

Fix: Replace the oil pump drive preventively

€700–1,500

High-pressure fuel pump (Bosch CP4.1)

usually 150,000–280,000 km · Medium risk

Signs: Metal debris in the fuel system — expensive if it fails; rarer with EU diesel

Fix: Quality fuel, fuel filter on time; replace pump and flush system

€1,500–4,000

Injector leak-off / wear

usually 160,000–260,000 km · Medium risk

Signs: Hard start, rough idle, smoke

Fix: Leak-off test; replace injectors

€700–1,600

2.7 / 3.0 TDI V6

Timing chain wear

usually 150,000–250,000 km · High risk

Signs: Rattle at rear of engine

Fix: Replace chains (gearbox off)

€3,000–5,000

EGR / DPF

usually 120,000–200,000 km · Medium risk

Signs: Limp mode

Fix: Clean or replace

€400–1,800

Swirl flaps / intake manifold (2004–2010)

usually 120,000–220,000 km · Medium risk

model years 2004–2010 only

Signs: Engine light, flap position codes

Fix: Replace intake manifold / actuator

€600–1,500

2.0 FSI / TFSI (EA113)

Cam follower wear (high-pressure fuel pump)

usually 40,000–100,000 km · High risk

engine codes: BWA, AXX, BPY, BWJ, CAWA, BHZ

Signs: Wear destroys the camshaft lobe; power loss, fuel pressure codes

Fix: Inspect and replace the follower every 50,000 km

€40–1,200

PCV valve / diaphragm

usually 60,000–140,000 km · Medium risk

Signs: Whistle, rough idle, oil leaks

Fix: Replace PCV valve

€100–250

Carbon build-up on intake valves

usually 80,000–160,000 km · Medium risk

Signs: Misfire, rough idle

Fix: Walnut blasting

€300–600

Intake manifold flap motor

usually 80,000–160,000 km · Wear part

Signs: Engine light

Fix: Replace motor / manifold

€150–600

1.8 / 2.0 TSI / TFSI (EA888)

Water pump / thermostat housing leak

usually 70,000–140,000 km · Medium risk

Signs: Coolant loss, overheating warning

Fix: Replace the pump + thermostat module

€400–800

PCV valve failure

usually 60,000–120,000 km · Wear part

Signs: Whistle at idle, lean codes, oil leaks

Fix: Replace PCV / oil separator

€100–250

Carbon build-up on intake valves

usually 100,000–180,000 km · Medium risk

Signs: Rough idle, misfires (direct injection)

Fix: Walnut blasting

€300–600

Timing chain tensioner (pre-2013)

usually 80,000–160,000 km · High risk

Signs: Rattle on start; early engines only

Fix: Upgraded tensioner and chain

€1,000–2,000

Excessive oil consumption (Gen 2, 2008–2012)

usually 60,000–180,000 km · High risk

model years 2008–2012 only

Signs: Needs 0.5–1 L per 1,000 km, blue smoke, sooty plugs

Fix: Oil consumption test; updated pistons and rings

€2,500–5,000

Gearboxes

Manual

Clutch wear

usually 120,000–200,000 km · Medium risk

Signs: Slipping, high bite point

Fix: Replace clutch kit

€500–900

Dual-mass flywheel

usually 150,000–220,000 km · Medium risk

Signs: Rattle at idle, vibration pulling away

Fix: Replace with clutch

€700–1,400

Automatic (Aisin / ZF Tiptronic)

Torque converter / valve body

usually 150,000–250,000 km · Wear part

Signs: Delayed or harsh shifts

Fix: Fluid service, repair

€300–2,500

Multitronic CVT (01J / 0AW)

Multitronic chain / clutch pack / control unit

usually 100,000–200,000 km · High risk

Signs: Judder pulling away, jerks, 'gearbox fault' limp mode

Fix: Fluid every 60,000 km; repair or exchange

€1,500–4,000

Scheduled service

Intervals and typical prices for the 2.0 TDI PD (EA188, 8v / 16v) engine. Other engines differ in oil, timing drive and some filters; the app gives the exact plan.

Item	Interval	Typical price
Engine oil + oil filterEngine	every 15,000 km or every 12 months	€70–150
Cabin (pollen) filterClimate	every 15,000 km or every 12 months	€15–40
Brake fluidBrakes	every 24 months	€50–95
A/C service (regas + desiccant)Climate	every 24 months	€70–150
Air filterEngine	every 30,000 km or every 24 months	€15–45
Fuel filterFuel	every 30,000 km or every 24 months	€40–110
Glow plugsEngine	every 100,000 km	€120–300
Auxiliary (serpentine) beltEngine	every 120,000 km	€70–180
Timing belt kit + water pumpEngine	every 120,000 km or every 60 months	€450–900
Coolant replacementCooling	every 150,000 km or every 96 months	€70–150
Manual gearbox oilTransmission	every 150,000 km	€60–130
Front brake padsBrakes	usually at 30,000–60,000 km	€60–150
Front brake discs + padsBrakes	usually at 60,000–120,000 km	€150–320
Rear brake padsBrakes	usually at 50,000–90,000 km	€50–130
Tyres (set of 4)Wheels	usually at 40,000–60,000 km	€320–700
Wiper bladesBody	checked at service	€20–50
12V batteryElectrical	checked at service	€100–220

Roadworthiness tests by mileage

Share of tests in the United Kingdom (DVSA MOT, 2024) that this model failed because of each system. Bold red means more often and green less often than an average car of the same age and mileage. Sample: 35,155 tests.

thousand km	50–100	100–150	150–200	200–250	250+
Brakes	2.8 %	3.1 %	4.6 %	5.1 %	6.1 %
Suspension	3.1 %	8.2 %	9.8 %	11.5 %	12.5 %
Steering	0.0 %	0.7 %	0.9 %	1.2 %	1.6 %
Tyres and wheels	5.7 %	6.9 %	8.1 %	9.0 %	9.5 %
Lights, wipers and visibility	7.3 %	9.7 %	13.9 %	15.1 %	19.3 %
Body and corrosion	1.3 %	2.4 %	2.9 %	3.8 %	4.3 %
Exhaust, emissions and leaks	0.8 %	3.0 %	4.0 %	4.7 %	6.2 %

Owner complaints in the US

Which systems owners reported to the US agency NHTSA and at what mileage. Complaints are not confirmed faults and some relate to recalls. Sample: 221 complaints.

Airbags and seat belts

usually 98–198 thousand km (median 135)

19 %

Electrics and electronics

usually 89–202 thousand km (median 136)

18 %

Engine

usually 13–180 thousand km (median 111)

16 %

Brakes

usually 84–163 thousand km (median 105)

10 %

Lights, wipers and visibility

usually 69–194 thousand km (median 145)

10 %

Steering

usually 118–209 thousand km (median 174)

6 %

Fuel and hybrid system

usually 56–183 thousand km (median 116)

6 %

Official recalls

Recalls the manufacturer published in the United Kingdom for this model (8). The same recalls usually apply across Europe. Ask an authorised dealer to check by VIN whether your car is affected and whether the work has been done.

Airbag Stop-drive TAKATA PSAN08/08/2025 · R/2025/387
Airbag Replacing Takata passenger airbag04/04/2024 · R/2024/158
Airbag If a front airbag is deployed it is possible that the gas generator housing in which the propellant is generated may burst on vehicles manufactured within a limited period.01/02/2023 · R/2023/053
Fire risk Coolant pump may overheat01/05/2017 · R/2017/115
Fuel system Fuel may leak20/04/2015 · R/2015/031
Airbag Curtain airbag may not inflate12/12/2011 · R/2012/014
Doors / locks / lids Tailgate may close without warning25/09/2007 · R/2007/120
Airbag Air bags may deploy too late11/11/2005 · R/2005/135

Other generations

Audi A1 (8X) 2010–2018 Audi A1 (GB) 2018–Audi A3 (8L) 1996–2003 Audi A3 (8P) 2003–2012 Audi A3 (8V) 2012–2020 Audi A3 (8Y) 2020–Audi A4 (B6) 2000–2004 Audi A4 (B7) 2004–2008 Audi A4 (B8) 2007–2015 Audi A4 (B9) 2015–2024 Audi A5 (8T) 2007–2016 Audi A5 (F5) 2016–2024 Audi A6 (C5) 1997–2004 Audi A6 (C7) 2011–2018 Audi A6 (C8) 2018–Audi A7 (4G) 2010–2018

Sources and notes

Faults, intervals and prices are indicative and collected from public sources and owner experience; always rely on the service book and a qualified workshop. Test statistics: DVSA – Anonymised MOT tests and results, Open Government Licence v3.0. Owner complaints: NHTSA ODI (public domain). Recalls: DVSA Vehicle Safety Branch Recalls Database, OGL v3.0. Brand and model names are trademarks of their owners and are used only to describe the vehicles.

Updated 07/10/2026

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