Audi 40 TDI Quattro Specialists

Audi A4 40 TDI Quattro Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Audi A4 40 TDI Quattro 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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Audi A4 40 TDI Quattro Engine

from£3,800 to £6,000...

Usedfrom £1,200
Reconditionedfrom £2,800
Common codesDET, DESA, DETA

Audi a4 40 TDI Quattro Used Engine — DET / DESA / DETA

Audi a4Used Engine — DET / DESA / DETA

Audi a4 40 TDI Quattro Reconditioned Engine — DET / DESA / DETA

Audi a4Reconditioned Engine — DET / DESA / DETA

Audi a4 40 TDI Quattro Rebuilt Engine — DET / DESA / DETA

Audi a4Rebuilt Engine — DET / DESA / DETA

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 A4 40 TDI Quattro Engine History & Specs at a Glance

Launched as the core diesel performance variant of the B9 generation, the 40 TDI Quattro badge signifies a 2.0-litre turbocharged diesel with all-wheel drive, evolving from the 190hp EA288 unit to the 204hp mild-hybrid iteration in the B9.5 facelift.

2015
DET / DESA / DETA, 2.0L TDI, 190hp (140kW). Introduced with the B9 generation, replacing older numerical badging with the new "40 TDI" nomenclature, paired with a 7-speed S tronic and Quattro all-wheel drive.
2020
DTPA / DTUA, 2.0L TDI Mild Hybrid, 204hp (150kW). Launched with the B9.5 facelift, featuring updated EA288 Evo architecture with a 12V mild-hybrid system for improved efficiency and increased power output.

Every engine fitted to the Audi A4 40 TDI Quattro is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Audi A4 40 TDI Quattro Engine Codes Specifications & Replacement Cost

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

DET / DESA / DETA — 2.0L Diesel (2015-2020)

Power Output: 190hp (140kW)
Years Fitted: 2015-2020

Can’t find your exact engine code?-> Get quotes for DET Audi A4 40 TDI Quattro engine replacement

-> Get quotes for DET Audi A4 40 TDI Quattro engine replacement

Common failure points and repair options

AdBlue & EGR System Failures

Affected: Audi A4 40 TDI Quattro (DET, DTPA, DTUA, 2015-present)
Typical failure mileage: 100k-180k miles

Root cause

The AdBlue heater element or NOx sensors can fail, while the EGR cooler is susceptible to internal leaks, triggering engine management lights and potential limp mode.

Repair options

Repair tier	Dealer price	Specialist price
Component Repair (AdBlue/EGR)	£1,200-£2,200	£600-£1,200
Full Replacement - rebuilt/reconditioned engine	£5,500-£7,500	£4,300-£6,700

Our recommendation

For isolated AdBlue or EGR faults on a well-maintained Audi A4 40 TDI Quattro, targeted component repair is the most cost-effective route. However, if the vehicle has exceeded 150k miles and exhibits multiple concurrent issues, a reconditioned engine replacement offers superior long-term value and peace of mind.

-> Compare rebuilt DET/DTPA Audi A4 40 TDI Quattro engine prices

DPF Clogging & Turbo Wear

Affected: Audi A4 40 TDI Quattro (DET, DTPA, DTUA, 2015-present)
Typical failure mileage: 120k-180k miles

Root cause

Frequent short, urban journeys prevent the diesel particulate filter (DPF) from completing active regeneration cycles, leading to ash buildup and increased backpressure that can prematurely wear the turbocharger.

Repair options

Repair tier	Dealer price	Specialist price
DPF Clean / Turbo Service	£800-£1,500	£500-£900
Full Replacement - rebuilt/reconditioned engine	£5,500-£7,500	£4,300-£6,700

Our recommendation

Preventative motorway driving is the best defence against DPF issues. If turbo failure has already occurred due to DPF-induced oil starvation, replacing the entire unit with a rebuilt engine is safer than attempting a standalone turbo swap, which risks contamination from existing debris.

-> Compare rebuilt DTPA Audi A4 40 TDI Quattro engine prices

Don't Let Engine Failure Write Off Your Audi A4 40 TDI Quattro

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 A4 40 TDI Quattro engines with upgraded components, comprehensive 12-month unlimited-mileage warranties, and nationwide supply & fit options.

Compare Audi A4 40 TDI Quattro Engine Replacement Prices Now ->

FAQ

Audi A4 40 TDI Quattro Engine ReplacementFrequently Asked Questions

Everything Audi A4 40 TDI Quattro owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

The cost to replace an Audi A4 40 TDI Quattro engine typically ranges from £1,200 for a used unit to £3,800-£6,000 for a fully rebuilt 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.

-> Compare Audi A4 40 TDI Quattro engine prices today

Owners of the Audi A4 40 TDI Quattro should watch for persistent engine management lights, excessive blue or black smoke from the exhaust, and a noticeable loss of power or limp mode.

Unusual rattling or knocking sounds from the engine bay.
Frequent AdBlue or DPF warning messages that do not clear after regeneration.
Unexplained coolant loss or oil consumption, which may indicate EGR or turbo issues.

-> Get a diagnostic quote for your Audi A4 40 TDI Quattro

Yes, for most owners, it is financially viable. The Audi A4 40 TDI Quattro retains strong residual values, typically ranging from £8,000 to £25,000 depending on the year and condition.

A rebuilt engine is a sensible investment for a B9.5 (2020+) model.
For older B9 (2015-2020) 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.

-> Check if your Audi A4 40 TDI Quattro is worth repairing

A professional supply and fit engine replacement for an Audi A4 40 TDI Quattro 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 Quattro drivetrain, and refilling of fluids.
Day 3: ECU coding, software updates, and comprehensive road testing to ensure all systems are functioning correctly.

-> Book your Audi A4 40 TDI Quattro supply & fit service

No, you must ensure the replacement engine matches your specific engine code (e.g., DET, DTPA, or DTUA) and is configured for Quattro all-wheel drive.

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.

-> Confirm your exact Audi A4 40 TDI Quattro engine code now

Why Choose Us

Compare Audi A4 40 TDI Quattro Engine Prices Today

Don't overpay at the main dealer. Comparing quotes through EnginesMarket is 100% free and carries no obligation. We connect you directly with vetted, specialist workshops across the UK who understand the unique requirements of the Audi A4 40 TDI Quattro, ensuring you get the right engine code, fair pricing, and peace of mind.

500+500+ Audi A4 40 TDI Quattro engines supplied through our network

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Compare quotes from trusted UK Audi A4 40 TDI Quattro engine specialists with warranty-backed rebuilt, reconditioned and used options nationwide.