A6 2.0 TDI Engines
from £1,495 to £3,200
Rebuilt units from £1,695 · Common codes: CAHA, CNHA, CAGA, CGLB
Audi ENGINE MARKETPLACE
Audi A6 EA888/EA839/EA288 Engine Solutions - UK 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 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
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Compare reconditioned, rebuilt & used engine prices
Supply & 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 specialistsHow 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
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
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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
A6
Engine Codes
Audi 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.
1Z/AHU - 1.9L Diesel
Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
Compatible variants
C4C4 AvantC4 SaloonC4 SE
Avg. rebuilt price
£800 - £1,400
Supply only
Technical specifications
- Fuel type
- Diesel
- Engine size
- 1.9L
- Power output
- 90-110 hp
- Years fitted
- 1994-2004
Common failures
- ●Main replacement triggers are timing chain wear, EGR / cooling faults and turbo-control issues.
- ●Confirm exact engine code and fitment before ordering.
- ●Ask for warranty and supply & fit terms.
Not sure which 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.
A6
Common Problems
Audi A6 Engine Problems - What It Costs to Fix & When Replacement Makes Sense
2.0 TDI EGR Cooler Failure - Why CAHA/CNHA Diesel Engines Clog Prematurely
2.0 TDI EGR Cooler Failure
Most affected vehicles
Audi A6 C7 2.0 TDI (2011-2018CAHA & CNHA)
Audi A6 C7 2.0 TDI (2011-2018, CAHA & CNHA), Audi A6 C8 2.0 TDI (2018-present, CNHA/CZJA)
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 | £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 | £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 | £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
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.
Compare CAHA & CNHA rebuilt engine prices for your Audi A6Replacement Engine Options
Audi A6 Engine TypesOptions, Costs & What to Expect
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 Refurbished Engines£1,300 - £2,400((supply only))
Compare Audi A6 engine prices with vetted UK suppliers
All engine types include a minimum 12-month unlimited mileage warranty when sourced through EnginesMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Audi A6 within hours.
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
ϟ
Power output
Verified by registration
△
Common Failure Points
EGR valve carbon clogging, injector pump seal wear at high mileage
Production Years: Check by registration
Get quotes for Audi A6 1.9L diesel enginesAudi A6 Engines Fuel Type
Audi A6 Engines by Fuel Type
Audi A6 Diesel Engines
DieselThe 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
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
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
Typical Diesel Models
- •A6 2.0 TDI ultra
- •A6 2.0 TDI S line
- •A6 3.0 TDI Quattro
1 of 3
Audi A6 Diesel Engines
DieselThe 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
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
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
Typical Diesel Models
- •A6 2.0 TDI ultra
- •A6 2.0 TDI S line
- •A6 3.0 TDI Quattro
Audi A6 Petrol Engines
PetrolPetrol A6 engines range from turbocharged four-cylinders to supercharged V6s and the legendary 4.2 V8 - with oil consumption dominating 2.0 TFSI replacement searches.
Common Audi A6 Petrol Engine Families
- •AJL/BFB - 1.8T, early turbo four for C5 and C6
- •CAEB/CDNB - 2.0 TFSI, severe oil consumption from piston ring clogging
- •BDW/AMM - 2.4 V6, smooth naturally aspirated entry-level six
Found In
- •C4 (1994-1997) - 2.2 turbo (S6), 4.2 V8 (S6 Plus)
- •C5 (1997-2004) - 1.8T, 2.4 V6, 2.8 V6, 3.0 V6, 4.2 V8 (S6)
- •C6 (2004-2011) - 2.0 TFSI, 2.4 V6, 2.8 V6, 3.0 TFSI, 4.2 V8 (S6)
Known For
- •2.0 TFSI oil consumption (1 litre per 1,000 miles)
- •Supercharged 3.0 TFSI offers lag-free torque
- •4.2 V8 timing chain replacement requires engine removal
Typical Petrol Models
- •A6 2.0 TFSI SE
- •A6 2.0 TFSI S line
- •A6 3.0 TFSI Quattro
Audi A6 Mild Hybrid (MHEV) Engines
MHEVThe C8 generation introduced 48V mild hybrid technology across diesel and petrol ranges, adding belt-driven starter generators and secondary batteries.
Audi A6 MHEV Engine Codes
- •CLZB - 3.0 TDI with 48V belt starter generator
- •DJPB - 4.0 TFSI V8 (RS6), 591hp with MHEV assistance
- •48V belt starter generator recovers braking energy
Found In
- •C8 (2018-present) 40 TDI, 45 TDI, 50 TDI, 55 TFSI, RS6 Avant
Important Notes
- •No plug-in hybrid A6 exists for C8 generation in the UK
- •MHEV engine replacement requires 48V battery and starter generator inspection
- •System calibration must be verified after any engine swap
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 YearsGet quotes for 1994-1997 Audi A6 replacement engines →
Audi A6 Engines by YearWhat Was Fitted & WhenAudi A6 Engines by Year - What 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.
⚙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
▣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
🔧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
Engine Codes Covered:
1ZAHUAELAANAECAHKNot sure which year your Audi A6 was built- Enter your registration number and we'll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12-month warranty from UK Audi A6 specialists.
FAQ