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Audi A6 Engine ReplacementCompare Prices & Save
Get quotes today from trusted UK Audi A6 engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available nationwide.
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
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How It Works
3 Simple Stepsto Finding the Best Audi A6 Replacement Engine
Get Instant Quotes from Audi Engine Specialists Across the UK - 100% free, no obligation. Most replacements completed within 3-5 days.
Most replacements completed within 3-5 days.
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
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
- Audi A6 (C7) 2.0 TFSI2011-2018£1,400-£2,600Oil consumptionCDNB/CAEBPetrol 2.0L
- Audi A6 (C7) 3.0 TDI2011-2018£1,800-£3,200Turbo actuator failureCDUD/CRTEDiesel 3.0L
- Audi A6 (C7) 3.0 TFSI2011-2018£2,200-£3,800Timing chain guide wearCREC/CGWBPetrol 3.0L
- Audi A6 (C8) 2.0 TDI2018-present£2,200-£3,400AdBlue system faultCNHA/CZJADiesel 2.0L
- Audi A6 (C6) 2.0 TDI2004-2011£1,200-£2,200EGR cooler failureBLB/BREDiesel 2.0L
- Audi A6 (C6) 2.7 TDI2004-2011£1,400-£2,500Injector failureCANA/CANBDiesel 2.7L
- Audi A6 (C6) 3.0 TDI2004-2011£1,600-£2,800Timing chain tensionerCDYA/CDYBDiesel 3.0L
- Audi A6 (C7) 2.0 TDI2011-2018£1,200-£2,400EGR cooler cloggingCAHA/CNHADiesel 2.0L
Last updated: 22 May, 14:59
Customer Reviews
Trusted by Audi A6 OwnersAcross the UK
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“Got three quotes within an hour and chose the best deal easily. The whole process was quick, clear and stress-free.”
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“I wasn't sure what I needed, but they helped me identify the right engine and connected me with a trusted garage.”
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Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
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Models We Cover
Audi A6 Engine ReplacementAll Variants Covered
From the economical ultra to the high-performance S line and Black Edition, our network of UK Audi A6 engine specialists helps you compare rebuilt, reconditioned and used engine prices. A typical rebuilt unit with 12-month warranty ranges from £1,200 to £3,800 - supply & fit available nationwide.
Core Diesel Range
Specs136-163hp
Years2011-2018
Rebuilt£1,200-£2,200
Core Petrol Range
Performance & Quattro Range
Generation & Legacy Range
Variant Directory
Diesel Variants
2.0 TDI2.7 TDI3.0 TDI V640 TDI50 TDIAvantAvant quattroBlack EditionBlack Edition quattroC6C7C8QuattroS lineS line quattroSESE quattroSportSport quattroultra
Petrol Variants
2.0 TFSI3.0 TFSI V640 TFSI45 TFSI55 TFSIAvantAvant quattroBlack EditionBlack Edition quattroC7C8QuattroS lineS line quattroSESE quattroSportPerformance Variants (Quattro / S line)Black Edition quattroC8 55 TFSIQuattroS line quattroNot sure which variant your Audi A6 is? Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.
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.
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
What It Costs to Fix & When Replacement Makes Sense
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
Affected Models
Audi A6 C7 2.0 TDI (2011-2018, CAHA & CNHA), Audi A6 C8 2.0 TDI (2018-present, CNHA/CZJA)
Typical Failure Mileage
60,000 - 100,000 miles
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
Affected Models
Audi A6 C7 2.0 TDI (2011-2018, CAHA & CNHA), Audi A6 C8 2.0 TDI (2018-present, CNHA/CZJA)
Typical Failure Mileage
60,000 - 100,000 miles
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.
Minor - EGR Cooler Cleaning
Dealer
£450 - £700
Specialist
£250 - £400
Chemical cleaning of cooler and EGR valve, adaption reset
20,000-30,000 miles - temporary fix only
Intermediate - EGR Cooler Replacement
Dealer
£800 - £1,200
Specialist
£500 - £800
New OEM or upgraded stainless steel cooler, new gaskets
80,000+ miles with genuine Audi cooler
Full Replacement - Rebuilt Engine
Dealer
£4,000 - £6,000
Specialist
£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 →Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Audi A6 and engine code. Every engine supplied through EnginesMarket carries a minimum 12‑month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
12-Month Warranty
Upgraded Components
Nationwide UK Delivery
Save vs Main Dealer Price
Replacement 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.
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
Audi A6 Diesel Engine Sizes
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
Watch for these known weak 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
Audi A6 Diesel Engines
Audi A6 Diesel Engines
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 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 Models (UK)
A6 2.0 TDI ultra
A6 2.0 TDI S line
A6 3.0 TDI Quattro
A6 3.0 TDI Black Edition
A6 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
Year Finder
Not sure which year your Audi A6 was built?
Not 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
Audi A6 Engine ReplacementFrequently Asked Questions
Question 1
How 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.
Key points
- • 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 2
Is 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.
Key points
- • 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 3
Should 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.
Key points
- • 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 4
How 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.
Key points
- • 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 5
Which 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.
Key points
- • 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 6
What 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.
Key points
- • Affects C8 2.0 TDI (CNHA/CZJA) and 3.0 TDI Euro 6 models
Question 7
What 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.
Key points
- • 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 8
Is 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.
Key points
- • 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 9
What 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.
Key points
- • 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 10
Can 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.
Key points
- • 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
Compare Audi A6 engine prices with vetted UK specialists
Compare engine prices for Audi A6 in the UK and get competitive quotes from garages near you.
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Warranty-backed rebuilt & used options
Every quote checked for fitment, quality and lead time.