J
Jimmy
★★★★★
“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
A6 Marketplace
Audi A6 EA888/EA839/EA288 Engine SolutionsUK Specialists
Get quotes from trusted UK Audi A6 engine specialists. Compare reconditioned & used engines for 2.0 TFSI to RS6 - EA888/EA839/EA288 covered. Get a quote before it's too late.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
A6 2.0 TDI Engines- from £1,495 to £3,200
Rebuilt units from £1,695
Common codes: CAHA, CNHA, CAGA, CGLB
A6 3.0 TDI V6 Engines- from £2,200 to £4,800
Rebuilt units from £2,500
Common codes: CDUD, CRCA, CPNB, CLZB
A6 2.0 TFSI Petrol Engines- from £1,600 to £3,500
Rebuilt units from £1,800
Common codes: CDNB, CYRB, CYPE, CDNC
🔒 Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Audi A6 specialists.
Instant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialists
Instant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialistsInstant engine replacement quote - 100% free, no obligationEngine replacement near me - UK-wide specialist networkCompare reconditioned, rebuilt & used engine pricesSupply & fit available - parts and labour from vetted specialists
How It Works
3 Simple Steps3 Simple Stepsto Finding the Best Audi A6 Replacement Engineto Finding the Best Audi A6 Replacement Engine
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Most replacements completed within 3-5 days.
Live UK Engine Market Data
A6 Engine Replacement
What Are UK Drivers Paying for Audi A6 Engine Replacement-
The table below shows typical UK rebuilt engine replacement costs across different Audi A6 variants, covering known failure causes, engine codes, fuel types, and engine sizes.
Average Market Prices
Last updated: 4 Aug 26, 9:26
Customer Reviews
Trusted by Audi A6 OwnersAcross the UK
★★★★★
4.8out of 5
Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used Audi A6 engines through EngineMarket.
P
Pete
★★★★★
“Got three quotes within an hour and chose the best deal easily. The whole process was quick, clear and stress-free.”
S
Sophie
★★★★★
“I wasn't sure what I needed, but they helped me identify the right engine and connected me with a trusted garage.”
Google
★★★★★
“
Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
- Jimmy, London
Had a good / bad experience? Please leave a review
Leave a review → - Your feedback helps other Audi A6 owners find trusted engine specialists.
Variants We Cover
Audi A6 Engine ReplacementAll Variants Covered
Audi A6 ultra
CAHA/CNHA 2.0L Diesel
Rebuilt Engines: £1,200-£2,200
Audi A6 S line
CDUD/CREC/CYRB 3.0L Diesel
Rebuilt Engines: £1,400-£3,800
Audi A6 Black Edition
CDUD/CREC/CNHA 3.0L Diesel
Rebuilt Engines: £1,400-£3,800
Audi A6 C6
BLB/BRE/CANA/CDYA 3.0L Diesel
Rebuilt Engines: £1,200-£2,800
Audi A6 C7
CAHA/CNHA/CDUD/CREC 3.0L Diesel
Rebuilt Engines: £1,200-£3,800
Audi A6 C8
CNHA/CZJA 3.0L Diesel
Rebuilt Engines: £2,200-£4,200
Audi A6 Avant
CAHA/CDUD/CREC 3.0L Diesel
Rebuilt Engines: £1,200-£3,800
Engine Codes
Audi A6 Engine CodesAudi A6 Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Audi A6 across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Diesel Engines
Extracted from detailed diesel engine families across Audi A6 variants.
Extracted from detailed diesel engine families across Audi A6 variants.
Can't find your engine code-
Can’t find your engine code- Enter your registration number above - we’ll instantly identify the exact unit, its technical specifications, and live replacement prices from UK Audi A6 engine specialists. Every rebuilt engine comes with a minimum 12-month unlimited mileage warranty.
Common Problems
Audi A6 Engine Problems
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
1. 2.0 TDI EGR Cooler Failure
Why CAHA/CNHA Diesel Engines Clog Prematurely
Most Affected Vehicles
TDI (2011-2018
CAHA & CNHA)
Audi A6 C8 2.0 TDI
Failure Mileage Range
60,000 - 100,000 miles
Typical failure window
Root Cause
The EGR cooler becomes blocked with carbon deposits from exhaust recirculation, reducing coolant flow and causing overheating. On Euro 6 engines (CNHA/CZJA), the additional AdBlue injection system accelerates crystallisation inside the cooler.
Repair Options & Estimated Costs (UK ranges)
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Minor - EGR Cooler Cleaning Minor | £450 - £700 | £250 - £400 | Chemical cleaning of cooler and EGR valve, adaption reset | 20,000-30,000 miles - temporary fix only |
Intermediate - EGR Cooler Replacement Intermediate | £800 - £1,200 | £500 - £800 | New OEM or upgraded stainless steel cooler, new gaskets | 80,000+ miles with genuine Audi cooler |
Full Replacement - Rebuilt Engine Best Value | £4,000 - £6,000 | £2,200 - £3,500 | Complete rebuilt unit with upgraded EGR system, new cooler, supply & fit | 100,000+ miles, includes 12-month warranty |
Our Recommendation
Best next step for 2.0 tdi egr cooler failure
On a C7 A6 worth £4,000-£8,000, a specialist EGR cooler replacement with an upgraded stainless steel unit is the smartest investment - it resolves the root cause permanently. Dealer cleaning is a short-term patch that rarely lasts beyond 12 months. If the cooler has already failed catastrophically and contaminated the oil or caused head gasket damage, a full rebuilt engine is the only reliable path.
Don't Let Engine Failure Write Off Your Audi A6
A failed engine doesn't have to mean the end of your A6. Whether you're facing EGR cooler blockage on a 2.0 TDI, oil pump failure on a C6, or timing chain tensioner failure on a 3.0 TDI V6, EnginesMarket makes it simple to compare prices from trusted UK Audi A6 specialists. Every rebuilt engine comes with upgraded components targeting the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery. Compare prices today - get back on the road without the main dealer premium.
Compare Audi A6 Engine Replacement Prices Now →Audi A6 Engine Problems
What It Costs to Fix & When Replacement Makes Sense
Replacement Engine Options
Audi A6 Replacement Engine Types
Every engine type is available through our UK network with typical price ranges based on your A6 variant, engine code (CAHA, CNHA, CDUD, CREC) and budget.
Audi A6 Reconditioned Engines (Recon)£1,800 - £3,500(supply only)
Audi A6 Rebuilt Engines£1,600 - £3,200(supply only)
Audi A6 Used Engines£900 - £1,800(supply only)
Audi A6 Remanufactured Engines£2,200 - £4,200(supply only)
Audi A6 Supply & Fit Engines
Nationwide fitting network offering mobile or garage-based installation with diagnostic calibration.
Typical Price
£450 - £800
(added to engine price)
Engine Sizes
Audi A6 Engines by SizeFind the Right Displacement for Your Variant
The 1.9 TDI powered early C4 and C5 generation A6 models throughout the 1990s, establishing Audi's reputation for durable, economical diesel motoring. The 110bhp AFN/AVG units became the benchmark for executive diesel efficiency, while earlier 1Z/AHU offered simpler, bombproof mechanical injection. These engines are now rare but still sought after by high-mileage users.
| ENGINE CODE(S) | 1Z, AHU, AFN, AVG |
| COMPATIBLE MODELS (UK) | C4 (1994-1997), C5 (1997-2000) Saloon and Avant |
Common Failure Points
EGR valve carbon clogging, injector pump seal wear at high mileage
Not sure which engine size your Audi A6 needs- Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EnginesMarket include a minimum 12-month unlimited mileage warranty from UK Audi A6 specialists.
Audi A6 Engines Fuel Type
Audi A6 Engines by Fuel Type
The backbone of UK A6 sales across four generations, diesel engines dominate replacement enquiries - from 1.9 TDI simplicity to complex 3.0 V6 units with AdBlue and 48V systems.
Common Audi A6 Diesel Engine Families
1Z/AHU/AFN/AVG
1.9 TDI, bombproof mechanical injection for C4/C5
BLB/BRE
2.0 TDI, oil pump drive hex key failure on C6 (2004-2008)
CANA/CANB
2.7 TDI V6, C6-only unit with injector weakness
CAHA/CNHA
2.0 TDI Euro 5/6, fleet favourite with EGR cooler clogging
BMK/CDYA/CDYB
3.0 TDI V6, timing chain tensioner failure on early units
CDUD/CRTE
3.0 TDI, turbo actuator wear on C7 Quattro models
CLZB
3.0 TDI MHEV, 48V system integration for C8
Found In
C4 (1994-1997)
1.9 TDI, 2.5 TDI 5-cylinder
C5 (1997-2004)
1.9 TDI, 2.5 TDI V6
C6 (2004-2011)
2.0 TDI, 2.7 TDI V6, 3.0 TDI V6
C7 (2011-2018)
2.0 TDI, 3.0 TDI V6
C8 (2018-present)
2.0 TDI, 3.0 TDI V6 MHEV
Known For
Excellent motorway fuel economy (50-60mpg real world)
2.0 TDI oil pump drive failure on BLB/BRE (catastrophic)
EGR cooler clogging and AdBlue faults on Euro 6 units
3.0 TDI timing chain tensioner failure at 90k-140k miles
Typical Diesel Models
A6 2.0 TDI ultraA6 2.0 TDI S lineA6 3.0 TDI QuattroA6 3.0 TDI Black EditionA6 40 TDI (C8)A6 50 TDI (C8)
Not sure which fuel type your Audi A6 has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Audi A6 specialists.
Engine Years
Audi A6 Engines by YearWhat Was Fitted & When
From the 1994 C4 to the 2025 C9 generation, this timeline covers every engine change across UK-market Audi A6 models - helping you identify your engine and compare rebuilt prices from specialists.
1994 - 1997 - C4 (Typ 4A)
Major Platform Change
The first-generation A6 replaced the Audi 100, launching with carryover engines before introducing the legendary 2.2 turbo and 4.2 V8 in S6 form.
Key Changes
Launch of A6 badging (replacing Audi 100)
S6 introduced with 2.2 turbo 5-cylinder and 4.2 V8
Saloon and Avant (estate) body styles available
Quattro all-wheel drive optional across range
Known For
Built on legendary Audi 100 platform - robust and durable
1.9 TDI (1Z/AHU) is bombproof, still sought after today
2.2 turbo 5-cylinder (AAN) is a cult classic engine
4.2 V8 timing chain service requires engine-out work
Main Engines
1Z/AHU - 1.9L diesel (90-110hp)
AEL - 2.5L 5-cylinder diesel (140hp)
AAN - 2.2L turbo petrol (230hp, S6)
AEC/AHK - 4.2L V8 petrol (290-326hp, S6/S6 Plus)
Popular Models
Audi A6 1.9 TDI
Audi A6 2.5 TDI
Audi S6 2.2 Turbo
Audi S6 4.2 V8
Audi S6 Plus
Engine Codes Covered
1ZAHUAELAANAECAHK
Common Replacement Enquiries
Audi A6 1.9 TDI engine replacement
Audi S6 2.2 turbo rebuild
Audi A6 C4 engine compatibility
Get quotes for 1994-1997 Audi A6 replacement engines
1994 - 1997 - C4 (Typ 4A)
Major Platform Change
The first-generation A6 replaced the Audi 100, launching with carryover engines before introducing the legendary 2.2 turbo and 4.2 V8 in S6 form.
Key Changes
Launch of A6 badging (replacing Audi 100)
S6 introduced with 2.2 turbo 5-cylinder and 4.2 V8
Saloon and Avant (estate) body styles available
Quattro all-wheel drive optional across range
Known For
Built on legendary Audi 100 platform - robust and durable
1.9 TDI (1Z/AHU) is bombproof, still sought after today
2.2 turbo 5-cylinder (AAN) is a cult classic engine
4.2 V8 timing chain service requires engine-out work
Main Engines
1Z/AHU - 1.9L diesel (90-110hp)
AEL - 2.5L 5-cylinder diesel (140hp)
AAN - 2.2L turbo petrol (230hp, S6)
AEC/AHK - 4.2L V8 petrol (290-326hp, S6/S6 Plus)
Engine Codes Covered
1ZAHUAELAANAECAHK
Popular Models
Audi A6 1.9 TDI
Audi A6 2.5 TDI
Audi S6 2.2 Turbo
Audi S6 4.2 V8
Audi S6 Plus
Common Replacement Enquiries
Audi A6 1.9 TDI engine replacement
Audi S6 2.2 turbo rebuild
Audi A6 C4 engine compatibility
Get quotes for 1994-1997 Audi A6 replacement engines
FAQ
Audi A6 Engine ReplacementFrequently Asked Questions
Question 1How much does an Audi A6 engine replacement cost in the UK-
A rebuilt Audi A6 engine typically costs £2,500-£5,000 supply-only, rising to £3,500-£7,000 with professional fitting. Prices vary by engine code, variant and rebuild quality.
- 2.0 TDI (CAHA/CNHA) rebuilt units: £2,200-£3,500 supply-only
- 3.0 TDI V6 (CDUD/CRTE) rebuilt: £2,800-£4,500 supply-only
- 2.0 TFSI (CDNB/CYRB) rebuilt: £2,500-£4,000 supply-only
- Supply & fit adds £450-£800 to engine price
- Remanufactured units cost £5,000-£7,500, new engines £8,000+
Question 2Is the 2.0 TFSI oil consumption problem really that bad on the Audi A6-
Yes - the 2.0 TFSI (CAEB/CDNB, 2008-2015) is notorious for oil consumption reaching 1 litre per 1,000 miles due to faulty piston rings. Audi introduced a fix from 2015 onwards.
- Affects 2008-2015 A6 2.0 TFSI models with CAEB and CDNB codes
- Carbon-clogged piston rings cause oil to burn in combustion chamber
- Blue exhaust smoke and low oil warnings are early symptoms
- Permanent fix requires piston ring replacement (£2,200-£3,200 specialist)
Question 3Should I repair or replace my Audi A6 3.0 TDI with timing chain failure-
If the chain has snapped or jumped timing, replacement is usually the better choice. Repair costs £3,000+ for labour alone, and hidden valve damage is common once the chain fails.
- Preventive timing chain replacement (before failure): £1,400-£2,200 specialist
- Post-failure repair (chain snapped): £3,000-£5,000 with engine-out labour
- Rebuilt 3.0 TDI engine: £2,800-£4,500 supply-only
- Risk of bent valves increases repair cost significantly
- On A6 worth £4,000-£7,000, replacement often beats repair
Question 4How long does a rebuilt Audi A6 engine last-
A quality rebuilt Audi A6 engine lasts 75,000-150,000 miles - 8-12 years for most UK drivers. Lifespan depends entirely on rebuild quality and your maintenance habits.
- Professional rebuild with OEM parts: 100,000+ miles typical
- Proper break-in period (500-1,000 miles) critical for longevity
- Regular oil changes every 5,000-7,500 miles extend life significantly
- 12-month unlimited mileage warranty included with every EngineMarket supply
- Poor rebuilds may fail within 20,000-30,000 miles
Question 5Which Audi A6 engine is the most reliable-
The 3.0 TFSI supercharged V6 (CREC, 2011-2018) is widely considered the most reliable A6 engine, with robust construction and fewer emissions-related failures than diesel variants.
- 3.0 TFSI supercharged: Very good reliability, PCV failure main issue (£500-£800)
- 2.0 TDI (CAHA/CNHA): Good but EGR cooler fails 60k-100k miles
- 3.0 TDI V6: Fair reliability - timing chain tensioner weak point
- 2.0 TFSI (pre-2015): Avoid - oil consumption problems widespread
- Post-2015 2.0 TFSI: Improved piston rings fix the oil issue
Question 6What causes the AdBlue system fault and countdown to no start on my Audi A6-
The AdBlue injector crystallises when the engine stops mid-regeneration, blocking the nozzle. The system then locks the engine from restarting once the countdown reaches zero.
- Affects C8 2.0 TDI (CNHA/CZJA) and 3.0 TDI Euro 6 models
Question 7What is the difference between rebuilt and reconditioned Audi A6 engines-
Rebuilt means the engine is dismantled and worn parts replaced. Reconditioned (recon) means factory-grade restoration to OEM tolerances - typically higher quality and more expensive.
- Rebuilt engine: Worn bearings, rings, gaskets replaced - £1,600-£3,200
- Reconditioned engine: Full strip, inspection, CNC machining - £1,800-£3,500
- Remanufactured: Restored to factory specs with new components - £2,200-£4,200
- Used engine: Removed from donor with basic testing - £900-£1,800
- All EngineMarket suppliers provide minimum 12-month warranty
Question 8Is it worth replacing the engine on a high-mileage Audi A6-
Yes, if the rest of the car is sound. A £3,500-£5,000 rebuilt engine delivering 100,000 miles works out at 3.5p-5p per mile - far cheaper than replacing the car.
- Rebuild worthwhile if A6 body, gearbox and electrics are in good condition
- Typical break-even point: car worth £4,000-£7,000 after repair
- New engine replacement (£8,000+) rarely makes economic sense
- Used engine (£900-£1,800) is budget option but higher risk
- Get a full vehicle inspection before committing to engine replacement
Question 9What are the most common Audi A6 2.0 TDI engine problems-
EGR cooler clogging (CAHA/CNHA, 60k-100k miles) and oil pump drive failure (BLB/BRE, 2004-2008, 80k-120k miles) are the two most common - both can be catastrophic if ignored.
- EGR cooler failure: Coolant loss, overheating, potential head gasket damage
- Oil pump drive hex key failure (BLB/BRE): Zero oil pressure, destroys turbo and bottom end
- DPF clogging on short journeys: Regeneration required every 300-500 miles
- Injector failure on 2.7 TDI and 3.0 TDI: White smoke, rough idle
- Upgrade to stainless steel EGR cooler prevents recurrence
Question 10Can I get an Audi A6 engine replacement with fitting included-
Yes - EngineMarket connects you with a nationwide network of Audi specialists offering supply & fit from £450-£800 added to the engine price, including mobile fitting for C6/C7 models.
- Garage fitting available nationwide for all A6 generations
- Mobile fitting available for C6 and C7 models (C8 requires garage)
- Fitting includes old unit removal, new engine, coolant, oil and ECU coding
- 12-month labour warranty included on all specialist fitting
- C8 mild hybrid units require specialist calibration of 48V system
Why Choose Us
Why UK Audi A6 Owners Trust EnginesMarket
Find the best Audi A6 engine replacement near you
Compare engine prices for Audi A6 in the UK and get competitive quotes from garages near you.
100% FreeNo ObligationFast & secure processUK-based support
Trusted supplier network
Warranty-backed rebuilt & used options
Every quote checked for fitment, quality and lead time.