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Audi DEJA Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 367hp 2.5-litre turbocharged inline-5 engine fitted to the Audi RS3 and TT RS (2015-2018). Reconditioned Audi DEJA units are typically available from £4,500 , reflecting its specialist performance nature and limited UK rebuild market.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£2,500
Reconditioned from
£4,500
Rebuilt from
£6,500
GB
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Quotes only from vetted UK engine specialists.
Key Specs
Audi DEJA - Specifications at a Glance
Engine Code
DEJA
Fuel
Petrol
Configuration
2.5L inline-5, single turbo (EA855)
Power Output(s)
367 hp (270 kW)
Years Produced
2015-2018
UK Models Fitted
2 Audi models - full list in Compatibility below
Replaced
CJDA (2.5 TFSI 340hp)
Replaced By
DAZA (2.5 TFSI 400hp, 2019+)
Most Common Failure
Carbon buildup on intake valves and PCV diaphragm wear
Reconditioned Price Range
£4,500-£7,500 supply-only
Vetted UK specialists for DEJA replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Audi Models Use the DEJA-
TAG: Fitted To
02
Audi TT
CROSS-BRAND
DEJA is documented across 2 BMW applications spanning Audi RS3, Audi TT. Registration lookup confirms the exact suffix before quotes are sent.
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Prices
Audi DEJA Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £2,500-£4,000 | £3,150-£5,050 | 3-6 months |
Reconditioned | £4,500-£7,500 | £5,150-£8,550 | 12-24 months |
Rebuilt | £6,500-£10,000 | £7,150-£11,050 | 12-24 months |
The replacement cost for a DEJA is heavily influenced by the condition of the turbocharger and the extent of carbon buildup on the intake valves. Because this is a specialist inline-5 performance engine, reconditioned units command a significant premium over standard 4-cylinder replacements due to the limited pool of UK specialists capable of rebuilding the EA855 block. For a full breakdown of what affects your final bill, see our full reconditioned engine cost guide.
Labour Guide
Fitting a DEJA typically takes 10-14 hours at £65-£85/hr (specialist VAG independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Audi DEJA Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the DEJA, based on real-world data and verified failure patterns.
Verified issue focus: Carbon buildup on intake valves and PCV diaphragm wear.
1. Carbon Buildup on Intake Valves
1. Carbon Buildup on Intake Valves
Typical onset:
60,000-100,000 miles
What happens:
As a direct-injection engine, the DEJA does not wash its intake valves with fuel. Over time, oil vapour from the PCV system and exhaust gas recirculation create hard carbon deposits, leading to rough idling, misfires, and reduced performance.
Repair vs replace:
This is resolved via walnut blasting or chemical cleaning, not engine replacement. It is a routine maintenance item for high-mileage direct-injection Audi engines.
Read more about this issue
2. PCV Valve and Oil Separator Wear
2. PCV Valve and Oil Separator Wear
Typical onset:
80,000+ miles
What happens:
The integrated PCV diaphragm can rupture, causing excessive crankcase pressure. Symptoms include a whistling noise from the valve cover, rough idling, and increased oil consumption as oil is drawn into the intake.
Repair vs replace:
Replacing the PCV valve (often requiring valve cover removal) is a standard maintenance fix. It rarely necessitates a full engine replacement unless severe oil starvation has damaged the turbocharger or bearings.
Read more about this issue
3. Turbocharger Wastegate Rattle and Actuator Wear
3. Turbocharger Wastegate Rattle and Actuator Wear
Typical onset:
70,000-120,000 miles
What happens:
The turbocharger wastegate actuator can wear or the flap can develop play, causing a distinct rattling noise on cold start or under load. If the actuator fails completely, it can lead to overboost or underboost conditions and limp mode.
Repair vs replace:
A standalone turbocharger rebuild or replacement is required. If the turbo failure has sent debris into the engine, a full Audi DEJA engine replacement becomes necessary.
Read more about this issue
The EA855 2.5 TFSI architecture (including the DEJA) is widely regarded as one of Audi's most robust modern engines, with the early EA855 timing chain tensioner issues largely resolved before this 367hp revision was introduced .
Compare rebuilt DEJA prices with the failure already addressed
Engine Variants
How to Confirm You Have the DEJA
The DEJA engine code is stamped directly onto the engine block, typically located on a machined pad near the junction of the engine and transmission, and is also clearly listed on your vehicle’s V5C registration document under "Engine Capacity/Code". The DEJA is frequently confused with the earlier CJDA (340hp, 2011-2014) or the newer DAZA (400hp, 2019+). While they share the same 2.5-litre inline-5 architecture, the DEJA features specific ECU mapping, a revised turbocharger, and different exhaust manifold fitment. Fitting a CJDA or DAZA ECU or turbo to a DEJA without proper calibration will result in poor performance or fault codes.
Not entirely sure- Enter your registration above - we'll confirm your exact DEJA fitment before any quotes are sent.
Easily Confused
CJDA
the earlier 340hp 2.5 TFSI variant it evolved from, which lacked the revised turbocharger and exhaust manifold fitment of the 367hp DEJA.
Alternative / Next-Gen Code
DAZA
- the latest 400hp evolution of the 2.5 TFSI, featuring updated internals and emissions hardware, though it shares the same fundamental inline-5 architecture.
Confirm the exact DEJA fitment
Not entirely sure- Enter your registration above - we'll confirm your exact DEJA fitment before any quotes are sent.
Buying Guide
Buying a Replacement DEJA - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used DEJA can be a viable option for high-value host vehicles, provided it comes with documented service history confirming the PCV valve and turbocharger have been inspected. The primary risk is hidden carbon buildup or a fatigued turbocharger from aggressive previous ownership.
Reconditioned:
A properly reconditioned DEJA is the recommended choice for most owners. A reputable rebuild will thoroughly clean the intake ports via walnut blasting, install an updated PCV valve, and inspect the turbocharger, effectively resetting the engine's reliability clock.
Rebuilt:
A full rebuild is justified if the original unit suffered catastrophic failure (e.g., turbo debris ingestion or severe oil starvation). An upgraded rebuild should include forged internal components if the vehicle is slated for aftermarket performance tuning beyond the standard 367hp limit.
Supply & Fit Line:
Sourcing your DEJA through our network ensures you receive a vetted unit backed by a minimum 12-month warranty, with the option for nationwide supply or complete supply-and-fit service at a local VAG specialist.
Vehicle Value Note:
The DEJA is typically found in performance models (RS3, TT RS) that retain strong residual values, often ranging from £25,000 to £45,000 depending on year and condition . Because the host vehicle value comfortably exceeds the £4,500-£7,500 reconditioned supply cost, engine replacement is almost always a financially sound decision compared to writing off the vehicle.
Compare DEJA Engine Prices Now
Related Engines
Engines Related to the Audi DEJA
Explore engines that are closely related to the Audi DEJA, including its predecessor, successor, and key family variants.
Predecessor
CJDA
the earlier 340hp 2.5 TFSI variant it evolved from, which lacked the revised turbocharger and exhaust manifold fitment of the 367hp DEJA.
Successor
DAZA
- the latest 400hp evolution of the 2.5 TFSI, featuring updated internals and emissions hardware, though it shares the same fundamental inline-5 architecture.
FAQ
Audi DEJAFrequently Asked Questions
Question 1How much does an Audi DEJA engine replacement cost-
A reconditioned Audi DEJA engine typically costs between £4,500 and £7,500 for supply only, or £5,150 to £8,550 fully fitted by a specialist VAG independent . Used units start around £2,500 but carry the risk of hidden carbon buildup. Full rebuilds range from £6,500 to £10,000 supply only for comprehensive internal renewal. Compare DEJA engine prices from vetted UK VAG specialists.
- Used units start around £2,500 but carry the risk of hidden carbon buildup.
- Full rebuilds range from £6,500 to £10,000 supply only for comprehensive internal renewal.
Question 2What is the most common failure with the DEJA engine-
The most documented failure patterns for the DEJA are carbon buildup on the intake valves and PCV valve diaphragm wear, typically occurring between 60,000 and 100,000 miles . As a direct-injection engine, the DEJA is prone to hard carbon deposits causing rough idling and misfires. A ruptured PCV diaphragm causes excessive crankcase pressure and increased oil consumption. Get quotes for a rebuilt DEJA with these components already addressed.
- As a direct-injection engine, the DEJA is prone to hard carbon deposits causing rough idling and misfires.
- A ruptured PCV diaphragm causes excessive crankcase pressure and increased oil consumption.
Question 3Which car models use the Audi DEJA engine-
The DEJA is the 367hp 2.5-litre turbocharged inline-5 engine fitted primarily to the Audi RS3 (8V) and Audi TT RS (8S) between 2015 and 2018. It is fundamentally the same physical EA855 engine across both performance models. It produces 367 hp (270 kW) and is the core of Audi's compact performance lineup for that generation. Enter your registration to confirm your exact DEJA fitment.
- It is fundamentally the same physical EA855 engine across both performance models.
- It produces 367 hp (270 kW) and is the core of Audi's compact performance lineup for that generation.
Question 4Should I buy a used or reconditioned DEJA engine-
A reconditioned DEJA is strongly recommended over a used unit due to the known vulnerabilities of carbon buildup and PCV wear on higher-mileage examples. A proper recon includes walnut blasting of the intake ports and replacement of the PCV valve, effectively resetting the engine's reliability clock. Used units are only advisable with documented proof of recent carbon cleaning and turbocharger inspection. View our reconditioned Audi DEJA engine options.
- A proper recon includes walnut blasting of the intake ports and replacement of the PCV valve, effectively resetting the engine's reliability clock.
- Used units are only advisable with documented proof of recent carbon cleaning and turbocharger inspection.
Question 5How do I know if my car has the DEJA engine code-
The DEJA code is stamped directly onto the engine block near the transmission junction and is clearly listed on your vehicle’s V5C registration document. It is frequently confused with the earlier CJDA (340hp) or the newer DAZA (400hp). Fitting the wrong ECU or turbo from a sibling engine will result in poor performance or fault codes. Use our free registration lookup to verify your engine code instantly.
- It is frequently confused with the earlier CJDA (340hp) or the newer DAZA (400hp).
- Fitting the wrong ECU or turbo from a sibling engine will result in poor performance or fault codes.
Compare Audi DEJA Engine Prices Today
Get a free, no-obligation price comparison for your exact Audi DEJA engine. Our registration lookup confirms your fitment before any quotes are sent, ensuring you receive parts specific to your RS3 or TT RS. With reconditioned DEJA units from £4,500, comparing takes two minutes and could save you hundreds on specialist labour and parts markup.
Vetted UK Specialists
Vetted UK specialists for DEJA replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
Expert Support
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
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