Audi A6 2.0 TDI / 3540 TDI Engine Replacement - Compare Prices & Get Quotes
Get quotes today from trusted UK Audi A6 2.0 TDI / 35-40 TDI engine specialists. Compare prices on reconditioned, rebuilt and used engines to find the best supply and fit solution for your vehicle.
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12-Month Warranty
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From £3,800 to £6,000 [EM-QUOTE]
Used from £1,200 · Reconditioned from £2,800 · Common codes: CAGB, CGLB, CAHA, CNHA, DEJA, DEJB
From £1,200
Tested, bare/short engine
From £2,800
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Audi A6 2.0 TDI / 35-40 TDI Replacement Engineto Finding the Best Audi A6 2.0 TDI / 35-40 TDI Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryAudi A6 2.0 TDI / 35-40 TDI - Engine History & Specs at a Glance
The 2.0 TDI / 35-40 TDI badge has been the backbone of the Audi A6 range, evolving from the C6 generation's pioneering common-rail diesels through the C7's refined EA189/EA288 units, to the C8's highly efficient mild-hybrid 35 TDI and 40 TDI variants.
Variant HistoryAudi A6 2.0 TDI / 35-40 TDI - Engine History & Specs at a Glance
The 2.0 TDI / 35-40 TDI badge has been the backbone of the Audi A6 range, evolving from the C6 generation's pioneering common-rail diesels through the C7's refined EA189/EA288 units, to the C8's highly efficient mild-hybrid 35 TDI and 40 TDI variants.
Audi A6 2.0 TDI / 35-40 TDI
Fuel TypeDiesel (Mild-Hybrid from 2018)
Engine Size Range2.0L
Power Output Range136-204hpEngine History Timeline
CAGB 2.0L TDI, 136-170hp. Introduced with the C6 generation, marking the transition to common-rail diesel technology for improved refinement and efficiency.
CAHA / CGLB 2.0L TDI, 170hp. Launched with the C7 generation, featuring EA189 architecture with enhanced fuel economy and lower emissions.
CNHA 2.0L TDI, 190hp. Introduced with the C7 facelift, utilising EA288 architecture to meet Euro 6 standards, commonly badged as 40 TDI.
DEJA / DEJB 2.0L TDI Mild Hybrid, 150-204hp. Launched with the C8 generation, featuring a 12V mild-hybrid system for improved thermal efficiency, badged as 35 TDI and 40 TDI.
Key Specs Snapshot
Fuel TypeDiesel (Mild-Hybrid from 2018)Engine Size Range2.0LPower Output Range136-204hpYears Produced2004-presentEvery engine fitted to the Audi A6 2.0 TDI / 35-40 TDI is covered below, with UK rebuilt pricing and known failure points.
Audi A6 2.0 TDI / 35-40 TDI Engine Codes - Specifications & Replacement CostAudi A6 2.0 TDI / 35-40 TDI Engine Codes - Specifications & Replacement Cost
2.0L Diesel (2004-2015)
Power Output136-170hpYears Fitted2004-2015
Compatible Trim Levels
- 2.0 TDI SE
- 2.0 TDI Sport
- 2.0 TDI S line
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£900-£2,000
Reconditioned
Addressed known issues, tested
£2,200-£3,800
Rebuilt
Full teardown, upgraded internals
£3,200-£5,000
Common Failure
EGR valve clogging and DPF blockage, typically emerging between 80k-150k miles due to carbon accumulation and urban driving cycles.
The Audi A6 2.0 TDI / 35-40 TDI is generally robust, but high-mileage examples can suffer from emissions system wear and timing component fatigue. Rebuilt engines through EnginesMarket include upgraded components addressing original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the Audi A6 2.0 TDI / 35-40 TDI (CNHA/DEJA) Triggers Warning Lights
Affected Vehicles
Audi A6 2.0 TDI / 35-40 TDI (CNHA, DEJA, DEJB, 2015-present)
Typical Failure Mileage
100k-180k miles
Root Cause
The EGR cooler is susceptible to internal micro-cracks, while frequent short urban journeys prevent the DPF from completing active regeneration, leading to ash buildup and increased backpressure.
Why It Happens
The EGR cooler is susceptible to internal micro-cracks, while frequent short urban journeys prevent the DPF from completing active regeneration, leading to ash buildup and increased backpressure.
Dealer (parts + labour)
£1,200-£2,200
Specialist (parts + labour)
£600-£1,200
What it involves
Replacement of faulty EGR cooler or professional DPF cleaning.
Suitability
Viable if the core engine block and turbo are healthy.
1 - 2 daysDealer (parts + labour)
£5,500-£7,500
Specialist (parts + labour)
£4,300-£6,700
What it involves
Supply & fit of reconditioned/rebuilt EA288 2.0 TDI, upgraded components, 12-month warranty.
Suitability
The right call if multiple emissions components fail alongside high-mileage wear.
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Component Repair (EGR/DPF) Minor | £1,200-£2,200 | £600-£1,200 | Replacement of faulty EGR cooler or professional DPF cleaning. | Viable if the core engine block and turbo are healthy. | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £5,500-£7,500 | £4,300-£6,700 | Supply & fit of reconditioned/rebuilt EA288 2.0 TDI, upgraded components, 12-month warranty. | The right call if multiple emissions components fail alongside high-mileage wear. | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2015-2018 Audi A6 40 TDI is valued at approximately £8,000-£18,000, while 2018+ C8 35/40 TDI models sit around £18,000-£35,000 [THIRD-PARTY]. For vehicles worth £8,000+, a reconditioned or rebuilt replacement comfortably justifies the premium via warranty and reliability, keeping the repair cost well within the vehicle's retained value.
Our Recommendation
Our Recommendation
For isolated EGR or DPF faults on a well-maintained Audi A6 2.0 TDI / 35-40 TDI, targeted component repair is the most cost-effective route. However, if the vehicle has exceeded 150k miles and exhibits concurrent issues, a reconditioned engine replacement offers superior long-term value and peace of mind.
Don't Let Engine Failure Write Off Your Audi A6 2.0 TDI / 35-40 TDI
Navigating diesel engine repairs can be complex, but you don't have to accept main dealer premiums. By comparing quotes through EnginesMarket, you gain access to vetted UK specialists who provide rebuilt Audi A6 2.0 TDI / 35-40 TDI engines with upgraded components, comprehensive 12-month unlimited-mileage warranties, and nationwide supply & fit options.
Compare rebuilt CNHA Audi A6 2.0 TDI / 35-40 TDI engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"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 2.0 TDI / 35-40 TDI. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Audi A6 2.0 TDI / 35-40 TDI Engine ReplacementFrequently Asked Questions
Question 1How much does an Audi A6 2.0 TDI / 35-40 TDI engine replacement cost-
The cost to replace an Audi A6 2.0 TDI / 35-40 TDI engine typically ranges from £1,200 for a used unit to £3,800-£6,000 for a fully rebuilt EA288 engine (supply-only).
- Used engines are the most budget-friendly but carry higher risk.
- Reconditioned engines offer a balance of cost and reliability.
- Rebuilt engines provide the highest reliability with upgraded components.
Question 2What are the signs of a failing engine in an Audi A6 2.0 TDI / 35-40 TDI-
Owners of the Audi A6 2.0 TDI / 35-40 TDI should watch for persistent engine management lights, excessive black smoke from the exhaust, and a noticeable loss of power or limp mode.
- Unusual rattling sounds from the engine bay on cold starts (timing chain).
- Frequent AdBlue or DPF warning messages that do not clear after regeneration.
- Unexplained coolant loss, which may indicate an EGR cooler leak.
Question 3Is it worth replacing the engine in an Audi A6 2.0 TDI / 35-40 TDI-
Yes, for most owners, it is financially viable. The Audi A6 2.0 TDI / 35-40 TDI retains strong residual values, typically ranging from £8,000 to £35,000 depending on the generation and condition.
- A rebuilt engine is a sensible investment for a C8 (2018+) model.
- For older C7 (2011-2018) models, a high-quality reconditioned unit offers excellent value if you plan to keep the car for 2+ years.
- Always compare the replacement cost against the vehicle's current market value before proceeding.
Question 4How long does an Audi A6 2.0 TDI / 35-40 TDI engine replacement take-
A professional supply and fit engine replacement for an Audi A6 2.0 TDI / 35-40 TDI typically takes 2 to 3 working days.
- Day 1: Vehicle intake, draining of fluids, and careful removal of the faulty engine.
- Day 2: Installation of the replacement engine, reconnection of the drivetrain, and refilling of fluids.
- Day 3: ECU coding, software updates, and comprehensive road testing to ensure all systems are functioning correctly.
Question 5Will any 2.0 TDI engine fit my Audi A6 2.0 TDI / 35-40 TDI-
No, you must ensure the replacement engine matches your specific engine code (e.g., CAGB, CNHA, or DEJA) and is configured for your drivetrain (FWD or Quattro).
- Non-Quattro engines lack the necessary rear differential drive components and mounting points.
- Using an incorrect engine code can result in ECU incompatibility, DPF/AdBlue system errors, and failed MOT emissions tests.
- Entering your registration on EnginesMarket guarantees the quote is matched to your exact DVLA-registered engine specification.
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