How 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.

What 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; and early ECU (MSD80) MOSFET driver failure.

Is 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.

Is 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.

How 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.

What'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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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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BMW 3 Series 335i Engine

from£4,500 to £7,500

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Common codesN54B30A, N55B30A

BMW 3-seriesUsed Engine — N54B30A

BMW 3-series 335i Reconditioned Engine — N54B30A

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Variant History

BMW 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.

2006
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.
2007
N54B30A (306 hp), 2,979 cc. Extended to E91 335i Touring (European market).
2010
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.
2012
N55B30A (306 hp), 2,979 cc. Carried over into the F30 335i.
2015
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.

Every engine fitted to the BMW 3 Series 335i is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 3 Series 335i Engine Codes Specifications & Replacement Cost

(Source: EM-QUOTE from proprietary supplier data, using N54-family proxy pricing.)

N54B30A — 3.0-litre Petrol Twin-Turbo (2006-2010)

Power Output: 306 hp
Torque: 400 Nm
Years Fitted: 2006-2010

Can’t find your exact engine code?-> Get quotes for N54B30A BMW 3 Series 335i engine replacement

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Common Problems

BMW 3 Series 335i Engine Problems Repair Cost vs Replacement

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.

Common failure points and repair options

N54 HPFP & Injector Failure

Affected: 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.

Repair options

Repair tier	Dealer price	Specialist price
HPFP replacement	£1,200-£1,800	£700-£1,200
Injector replacement (set of 6)	£2,000-£3,000	£1,200-£2,000
Full Replacement - rebuilt/reconditioned engine	£8,000-£12,000	£5,500-£7,500 (matches Section 4's rebuilt figure for N54B30A)

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.

N55 Wastegate Rattle & Oil Leaks

Affected: BMW 3 Series 335i (N55B30A, 2010-2015)
Typical failure mileage: 60,000-100,000 miles

Root cause

The turbocharger wastegate can develop rattle due to wear in the wastegate arm bushing. Valve cover gasket and oil filter housing gasket leaks are common, leading to oil consumption and potential fire risk.

Repair options

Repair tier	Dealer price	Specialist price
Wastegate repair / turbo replacement	£2,000-£3,500	£1,200-£2,000
Valve cover gasket replacement	£800-£1,200	£400-£700
Full Replacement - rebuilt/reconditioned engine	£7,000-£10,000	£4,500-£6,500 (matches Section 4's rebuilt figure for N55B30A)

Our recommendation

-> Compare rebuilt N54B30A / N55B30A BMW 3 Series 335i engine prices

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.

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FAQ

BMW 3 Series 335i Engine ReplacementFrequently Asked Questions

Everything BMW 3 Series 335i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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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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