How much does an Audi A6 30 TDI / 45 TDI / 50 TDI engine replacement cost-

The cost varies based on the engine's condition and specific code (e.g., DEZF vs DDVB). Used engines typically range from £1,200 to £4,500. Reconditioned units cost between £2,800 and £7,000. Fully rebuilt engines with warranties range from £3,800 to £9,000.

What are the signs of 48V mild-hybrid or EGR failure in an Audi A6 30 TDI / 45 TDI / 50 TDI-

Electrical and cooling system failures are known vulnerabilities in the C8 MHEV architecture. Dashboard warnings for 48V electrical faults or low coolant levels. Noticeable loss of power, rough idling, or frequent limp mode activation. Sweet-smelling coolant odour or visible puddles under the vehicle.

Is it worth replacing the engine in a modern Audi A6 30 TDI / 45 TDI / 50 TDI-

Yes, for most owners, due to the vehicle's strong retained value and the high cost of equivalent new models.

How long does an Audi A6 30 TDI / 45 TDI / 50 TDI engine replacement take-

A professional supply and fit service is highly efficient, typically completing the entire process within 3 to 5 working days to minimise your downtime.

Audi 30 TDI / 45 TDI / 50 TDI SPECIALISTS

Audi A6 30 TDI / 45 TDI / 50 TDI Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Audi A6 30 TDI / 45 TDI / 50 TDI engine specialists. Compare prices on reconditioned, rebuilt and used engines to find the most cost-effective, reliable solution for your vehicle.

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Audi A6 30 TDI / 45 TDI / 50 TDI Engine

from£3,800 to £9,000

Usedfrom £1,200
Reconditionedfrom £2,800
Common codesDEZF, DDVE, DDVB

Audi a6 30 TDI / 45 TDI / 50 TDI Used Engine — DEZF

Audi a6Used Engine — DEZF

Audi a6 30 TDI / 45 TDI / 50 TDI Reconditioned Engine — DEZF

Audi a6Reconditioned Engine — DEZF

Audi a6 30 TDI / 45 TDI / 50 TDI Rebuilt Engine — DEZF

Audi a6Rebuilt Engine — DEZF

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide NetworkInstant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Audi A6 30 TDI / 45 TDI / 50 TDI Engine History & Specs at a Glance

When the 30 TDI, 45 TDI, and 50 TDI badges were introduced for the C8 generation, they signified Audi’s strategic shift towards 48V mild-hybrid (MHEV) diesel technology, offering a refined, efficient, and powerful lineup for the executive saloon and Avant.

2018
50 TDI (DDVB/DMGA, 3.0L V6, 286hp) and 45 TDI (DDVE, 3.0L V6, 231hp) launched with the C8 generation, featuring 48V mild-hybrid systems for improved efficiency and smoother stop-start operation.
2019
30 TDI (DEZF, 2.0L inline-4, 136hp) introduced as the entry-level diesel, utilising the EA288 architecture with mild-hybrid assistance to maximise fuel economy for high-mileage drivers.

Every engine fitted to the Audi A6 30 TDI / 45 TDI / 50 TDI is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Audi A6 30 TDI / 45 TDI / 50 TDI Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

DEZF — 2.0L Diesel (2019-present)

Power Output: 136hp
Years Fitted: 2019-present

Can’t find your exact engine code?-> Get quotes for DEZF Audi A6 30 TDI / 45 TDI / 50 TDI engine replacement

-> Get quotes for DEZF Audi A6 30 TDI / 45 TDI / 50 TDI engine replacement

Common failure points and repair options

48V Mild-Hybrid Alternator & EGR Cooler Leaks

Affected: Audi A6 30 TDI / 45 TDI / 50 TDI (DEZF, DDVE, DDVB, 2018-present)
Typical failure mileage: 60,000-100,000 miles

Root cause

The belt-driven starter generator (BSG) in the 48V MHEV system can fail, while thermal stress on the EGR cooler can cause internal coolant leaks into the combustion chamber.

Repair options

Repair tier	Dealer price	Specialist price
Minor/Preventative	£800-£1,500	£400-£900
Full Replacement - rebuilt/reconditioned engine	£8,000-£12,000	£6,000-£9,000

Our recommendation

Address coolant or electrical warnings immediately. If the engine block is undamaged, a specialist BSG or EGR repair is cost-effective. However, if overheating has caused internal damage, a full rebuilt engine is the only safe long-term solution.

-> Compare rebuilt DEZF Audi A6 30 TDI / 45 TDI / 50 TDI engine prices

AdBlue System & DPF Regeneration Faults

Affected: Audi A6 30 TDI / 45 TDI / 50 TDI (DDVE, DDVB, 2018-present)
Typical failure mileage: 80,000-120,000 miles

Root cause

Crystallisation of AdBlue fluid can block dosing lines or damage the NOx sensor, while frequent short trips prevent the DPF from reaching optimal regeneration temperatures.

Repair options

Repair tier	Dealer price	Specialist price
Minor/Preventative	£600-£1,200	£300-£700
Full Replacement - rebuilt/reconditioned engine	£8,000-£12,000	£6,000-£9,000

Our recommendation

Address AdBlue warnings immediately. Early intervention with a specialist sensor or dosing unit replacement is inexpensive compared to the catastrophic engine failure that can result from ignored DPF blockages or coolant leaks.

-> Compare rebuilt DDVE Audi A6 30 TDI / 45 TDI / 50 TDI engine prices

Don't Let Engine Failure Write Off Your Audi A6 30 TDI / 45 TDI / 50 TDI

Navigating premium executive car repairs can be complex, but you do not have to accept main dealer premiums. By comparing quotes through EnginesMarket, you gain access to vetted UK specialists who provide rebuilt Audi A6 30 TDI / 45 TDI / 50 TDI engines with upgraded components, comprehensive 12-month unlimited-mileage warranties, and nationwide supply & fit options.

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FAQ

Audi A6 30 TDI / 45 TDI / 50 TDI Engine ReplacementFrequently Asked Questions

Everything Audi A6 30 TDI / 45 TDI / 50 TDI owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

They represent different power outputs and architectures within the C8 diesel lineup.

DEZF is a 2.0L inline-4 (136hp) designed for maximum efficiency in the 30 TDI.
DDVE is a 3.0L V6 (231hp) offering a balance of performance and refinement for the 45 TDI.
DDVB/DMGA is a high-output 3.0L V6 (286hp) delivering premium performance for the 50 TDI.

-> Confirm your exact engine code and get matched with the right specialist.

Why Choose Us

Compare Audi A6 30 TDI / 45 TDI / 50 TDI Engine Prices Today

Do not overpay for your Audi A6 30 TDI / 45 TDI / 50 TDI engine replacement. Our free, no-obligation comparison tool connects you directly with vetted UK specialists. Whether you need a budget-friendly used unit or a fully rebuilt engine with a comprehensive warranty, we ensure you get the best price for your exact DEZF, DDVE, or DDVB engine code, without the main dealer markup.

HundredsHundreds of Audi A6 30 TDI / 45 TDI / 50 TDI engines supplied through our network

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