BMW 3 Series 335i Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW 3 Series 335i engine specialists. Compare prices on reconditioned, rebuilt and used engines for every generation of the 335i - from the E90 N54 twin-turbo through to the F30 N55 single twin-scroll turbo six-cylinder petrol.
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12-Month Warranty
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From £4,500 to £7,500
Used from £2,500 · Reconditioned from £4,000 · Common codes: N54B30A, N55B30A
From £2,500
Tested, bare/short engine
From £4,000
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 3 Series 335i Replacement Engineto Finding the Best BMW 3 Series 335i Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 3 Series 335i - Engine History & Specs at a Glance
The BMW 335i arrived in 2006 as a landmark moment for the 3 Series - it was the first non-M 3 Series to feature a turbocharged petrol engine. The twin-turbo N54 six-cylinder delivered 306 hp, transforming the 3 Series into a genuine performance saloon. Over its production life, the 335i was powered by two generations of BMW six-cylinder petrol engines - the N54 and the N55 - each delivering exhilarating performance with distinctive character.
Variant HistoryBMW 3 Series 335i - Engine History & Specs at a Glance
The BMW 335i arrived in 2006 as a landmark moment for the 3 Series - it was the first non-M 3 Series to feature a turbocharged petrol engine. The twin-turbo N54 six-cylinder delivered 306 hp, transforming the 3 Series into a genuine performance saloon. Over its production life, the 335i was powered by two generations of BMW six-cylinder petrol engines - the N54 and the N55 - each delivering exhilarating performance with distinctive character.
BMW 3 Series 335i
Fuel TypePetrol
Engine Size2,979 cc
Power Output306 hp (both N54 and N55)Engine History Timeline
N54B30A (306 hp) 2,979 cc, six-cylinder twin-turbo petrol. Launched in the E90 335i saloon, followed by E92 335i Coupé and E93 335i Convertible.
N54B30A (306 hp) 2,979 cc. Extended to E91 335i Touring (European market).
N55B30A (306 hp) 2,979 cc. Introduced with the E90 LCI (Life Cycle Impulse) update, replacing the twin-turbo N54 with a single twin-scroll turbo N55 for improved response and efficiency.
N55B30A (306 hp) 2,979 cc. Carried over into the F30 335i.
335i badge discontinued in the UK; replaced by the 340i with the B58 engine. The 335i nameplate ended after two generations of turbocharged six-cylinder excellence.
Key Specs Snapshot
Fuel TypePetrolEngine Size2,979 ccPower Output306 hp (both N54 and N55)Years Produced2006-2015Every engine fitted to the BMW 3 Series 335i is covered below, with UK rebuilt pricing and known failure points.
BMW 3 Series 335i Engine Codes - Specifications & Replacement CostBMW 3 Series 335i Engine Codes - Specifications & Replacement Cost
3.0-litre Petrol Twin-Turbo (2006-2010)
Power Output306 hpTorque400 NmYears Fitted2006-2010
Compatible Trim Levels
- 335i
- 335i SE
- 335i M Sport
- 335i xDrive
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£2,500-£4,000
Reconditioned
Addressed known issues, tested
£4,000-£6,500
Rebuilt
Full teardown, upgraded internals
£5,500-£7,500
Common Failure
High-pressure fuel pump (HPFP) failure is the N54's most notorious weakness, so widespread it led to a class-action lawsuit. Fuel injector failure and turbocharger wastegate rattle are also common. Early N54 engines (MSD80 DME) can suffer from fuel injector MOSFET driver failure in the ECU.
The BMW 3 Series 335i is powered by two generations of six-cylinder petrol engines - the twin-turbo N54 and the single twin-scroll turbo N55. Both deliver 306 hp and are prized by enthusiasts, but they have well-documented weaknesses. The N54 is notorious for HPFP and injector failures, while the N55 suffers from wastegate rattle and oil leaks. Rebuilt engines supplied through EnginesMarket include upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the BMW 3 Series 335i N54 Needs Attention
Affected Vehicles
BMW 3 Series 335i (N54B30A, 2006-2010)
Typical Failure Mileage
40,000-80,000 miles
Root Cause
The high-pressure fuel pump (HPFP) is prone to premature failure, leading to long cranking, loss of power, and engine stalling. Fuel injectors can become clogged or fail, causing misfires and rough running. Early N54 ECUs (MSD80) can also suffer from MOSFET driver failure.
Why It Happens
The high-pressure fuel pump (HPFP) is prone to premature failure, leading to long cranking, loss of power, and engine stalling. Fuel injectors can become clogged or fail, causing misfires and rough running. Early N54 ECUs (MSD80) can also suffer from MOSFET driver failure.
Dealer (parts + labour)
£1,200-£1,800
Specialist (parts + labour)
£700-£1,200
What it involves
Replace high-pressure fuel pump, update software
Suitability
Essential if HPFP failure symptoms present
1 - 2 daysDealer (parts + labour)
£2,000-£3,000
Specialist (parts + labour)
£1,200-£2,000
What it involves
Replace all six injectors with latest index
Suitability
Often required alongside HPFP work
1 - 2 daysDealer (parts + labour)
£8,000-£12,000
Specialist (parts + labour)
£5,500-£7,500 (matches Section 4's rebuilt figure for N54B30A)
What it involves
Supply & fit, upgraded fuel system components, 12-month warranty
Suitability
When engine is already damaged or high-mileage rebuild needed
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 |
|---|---|---|---|---|---|
 HPFP replacement Minor | £1,200-£1,800 | £700-£1,200 | Replace high-pressure fuel pump, update software | Essential if HPFP failure symptoms present | 1 - 2 days |
 Injector replacement (set of 6) Best Value | £2,000-£3,000 | £1,200-£2,000 | Replace all six injectors with latest index | Often required alongside HPFP work | 1 - 2 days |
Full Replacement - rebuilt/reconditioned engine Best Value | £8,000-£12,000 | £5,500-£7,500 (matches Section 4's rebuilt figure for N54B30A) | Supply & fit, upgraded fuel system components, 12-month warranty | When engine is already damaged or high-mileage rebuild needed | 1 - 2 days |
Our Recommendation
Our Recommendation
If you own an N54-powered BMW 3 Series 335i, address HPFP and injector issues promptly - they can cause lean running and engine damage if ignored. For N55 owners, keep an eye on oil leaks and listen for wastegate rattle. Both engines are fundamentally robust and rewarding, but preventative maintenance is key to avoiding a full engine replacement. For high-mileage examples, a rebuilt engine with upgraded components is often the most cost-effective long-term solution.
Don't Let Engine Failure Write Off Your BMW 3 Series 335i
Whether you're dealing with N54 HPFP failure, N55 wastegate rattle, or simply want to compare prices for a used or reconditioned BMW 3 Series 335i engine, EnginesMarket connects you with vetted UK specialists. Every rebuilt engine carries a minimum 12-month unlimited-mileage warranty with upgraded components addressing the original failure points. Compare quotes today and avoid main dealer premiums.
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 BMW 3 Series 335i. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 3 Series 335i Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW 3 Series 335i engine replacement cost-
A BMW 3 Series 335i engine replacement typically costs between £4,500 and £7,500 for a rebuilt six-cylinder unit, depending on the engine code (N54 or N55) and the supplier.
- Used BMW 3 Series 335i engines: £2,200-£4,000
- Reconditioned BMW 3 Series 335i engines: £3,800-£6,500
- Rebuilt BMW 3 Series 335i engines: £4,500-£7,500
Question 2What are the common problems with the BMW 335i N54 engine-
The N54 engine in the BMW 3 Series 335i (2006-2010) has several well-documented issues:
- High-pressure fuel pump (HPFP) failure - causing long cranking and loss of power
- Fuel injector failure - leading to misfires and rough running
- Turbocharger wastegate rattle
- Early ECU (MSD80) MOSFET driver failure
Question 3Is the BMW 335i N55 engine more reliable than the N54-
Yes - the N55 engine in the BMW 3 Series 335i (2010-2015) is generally considered more reliable than the N54. It uses a single twin-scroll turbo instead of twin turbos, reducing complexity. However, it still has common issues including turbocharger wastegate rattle, valve cover gasket leaks, and electric water pump failures.
-> Compare N55B30A BMW 3 Series 335i engine pricesQuestion 4Is it worth replacing the engine in a BMW 3 Series 335i-
It depends on the age and condition of your car. For an E90 335i worth under £5,000, repairing HPFP/injector issues or fitting a used engine often makes more sense than a full rebuilt unit. For an F30 335i worth £8,000+, a reconditioned or rebuilt engine with warranty is a sound investment given the car's retained value.
-> Compare BMW 3 Series 335i engine pricesQuestion 5How long does a BMW 3 Series 335i engine replacement take-
A BMW 3 Series 335i engine replacement typically takes 12-16 labour hours for the six-cylinder N54 or N55 unit. With a specialist, this usually means 2-4 working days from drop-off to collection.
- Supply only: engine can be delivered next working day
- Supply & fit: allow 3-4 days for the complete job
Question 6What's the difference between the BMW 335i N54 and N55 engines-
Both the BMW 335i N54 and N55 are 3.0-litre six-cylinder turbocharged petrol engines producing 306 hp.
- N54: twin-turbo (two separate turbos), used 2006-2010
- N55: single twin-scroll turbo, used 2010-2015
- The N55 offers better throttle response and improved fuel economy; the N54 is a more potent tuning platform
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Comparing quotes for your BMW 3 Series 335i engine replacement is free, quick and carries no obligation. Whether you need a used N54B30A, a reconditioned N55B30A with upgraded components, or a rebuilt engine with full warranty, EnginesMarket connects you with vetted UK specialists who know BMW 3 Series 335i six-cylinder turbos inside out. Enter your registration above and get tailored quotes in minutes.
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