BMW 3 Series 335i2006–20153.0L Twin-Turbo / Twin-Scroll Turbo I6

BMW 3 Series 335i Engine Replacement —Compare Prices &
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Get quotes today from trusted UK BMW specialists. Compare reconditioned, rebuilt and used N54 and N55 3.0-litre turbocharged engines for the 3 Series 335i — the game-changing twin-turbo six that redefined BMW performance. Supply & fit available nationwide.

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BMW 3 Series 335i Engines — from £1,500 to £5,500Common codes: N54B30 (Twin-Turbo), N55B30 (Twin-Scroll)

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BMW 3 Series 335i — Which Engine Does Your Car Actually Have?

Three generations. Three eras. One guide to reliability, costs and what really matters.

Era Note

BMW's first mass‑production turbo petrol — HPFP and injector issues are defining weaknesses

Era Note

Single twin‑scroll turbo — more reliable than N54, but valve cover and OFHG leaks remain

Era Note

F30‑era N55 — same core engine, electric wastegate, revised charge pipe

Generation	Years	Engine Code	Recon Cost (Guide)	Era Note
E90/E91/E92/E93	2006–2010	N54B30(3.0L Twin-Turbo I6)	£2,800–£4,500[PLACEHOLDER]	BMW's first mass‑production turbo petrol — HPFP and injector issues are defining weaknesses
E90/E91/E92/E93 (LCI)	2010–2013	N55B30(3.0L Twin-Scroll I6)	£2,500–£4,200[PLACEHOLDER]	Single twin‑scroll turbo — more reliable than N54, but valve cover and OFHG leaks remain
F30/F31	2011–2015	N55B30(3.0L Twin-Scroll I6)	£2,500–£4,500[PLACEHOLDER]	F30‑era N55 — same core engine, electric wastegate, revised charge pipe

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UKCost Data
VerifiedReliability
ExpertInsights
Updated for2025

BMW 3 Series 335i Engine Replacement Costs

Supply Only£2,800 – £4,200
Fitted (Indie)£3,800 – £5,500
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£1,500 – £2,800	£2,300 – £4,000	1–6 months	Budget priority; short‑term ownership
Reconditioned Engine	£2,800 – £4,200	£3,800 – £5,500	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£3,800 – £5,500	£4,800 – £6,800	12–24 months	Long‑term ownership; maximum reliability
Main Dealer New	£6,000 – £8,500	£7,500 – £10,500	24–36 months	Insurance jobs; warranty claims; full provenance

Figures above reflect the 335i pricing across generations. The N54 and N55 have broadly similar replacement costs, though N54 engines (with twin turbos) may command a slight premium. Older generations: see the Era Map above for generation-specific pricing. A full engine replacement with labour can cost £9,000–£13,000 for premium vehicles.

Labour estimate: Fitting a 335i engine typically takes 10–14 hours at £75–£110/hr (independent BMW specialist). N54 twin-turbo variants may require additional labour due to turbo system complexity.

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Common Problems With BMW 3 Series 335i Engines

1. High‑Pressure Fuel Pump (HPFP) Failure — N54(E90, 2006–2010)

Symptoms: Long cranking on cold or hot start, loss of power, engine stalling, engine warning light (limp mode), reduced fuel economy — in extreme cases, the car may leave you stranded.
Typical Mileage: 20,000–60,000 miles (some owners experienced multiple failures within a few thousand miles).
Repair Cost: £600–£1,200 [PLACEHOLDER] (HPFP replacement).
Replacement Cost: N/A — repair only (if caught early).
Urgency: Immediate — if you experience long cranking or stalling, book an inspection immediately.

Our recommendation:

HPFP failure is the most notorious issue with the N54 engine. BMW issued recalls covering over 150,000 vehicles in the US for N54 HPFP failures. Symptoms include extended cranking times, particularly when hot, and the car going into limp mode. A failed HPFP can leave you stranded. While replacement is straightforward, the N54's HPFP is a known weak point — budget for it. The N55 uses an updated HPFP design that is more reliable.

1. High‑Pressure Fuel Pump (HPFP) Failure — N54(E90, 2006–2010)

Symptoms: Long cranking on cold or hot start, loss of power, engine stalling, engine warning light (limp mode), reduced fuel economy — in extreme cases, the car may leave you stranded.
Typical Mileage: 20,000–60,000 miles (some owners experienced multiple failures within a few thousand miles).
Repair Cost: £600–£1,200 [PLACEHOLDER] (HPFP replacement).
Replacement Cost: N/A — repair only (if caught early).
Urgency: Immediate — if you experience long cranking or stalling, book an inspection immediately.

Our recommendation:

2. Fuel Injector Failure — N54(E90, 2006–2010)

Symptoms: Rough idle, misfire, hesitation on acceleration, engine warning light, fuel smell from the engine bay, increased fuel consumption.
Typical Mileage: 30,000–80,000 miles (can vary significantly).
Repair Cost: £800–£2,000 [PLACEHOLDER] (injector replacement — all six injectors should ideally be replaced as a set with updated index 12 injectors).
Replacement Cost: N/A — repair only (if caught early; ignored injector failure can damage the catalytic converter).
Urgency: Check — book inspection urgently if misfire or rough running occurs.

Our recommendation:

The N54's piezo direct injectors are a known failure point. BMW released updated injectors (index 12) to address the issue, but failure can still occur on higher-mileage examples. Symptoms include rough idle, misfire, and fuel smell. When replacing injectors, it's strongly recommended to replace all six and have the DME calibrated. A full set replacement typically costs £800–£2,000 including labour — cheaper than dealing with a failed catalytic converter or engine damage.

3. Wastegate Rattle / Turbocharger Failure — N54(E90, 2006–2010)

Symptoms: Metallic rattling noise from the engine bay during deceleration or at idle, loss of boost pressure, reduced power, engine warning light.
Typical Mileage: 40,000–80,000 miles.
Repair Cost: £1,500–£3,500 [PLACEHOLDER] (turbocharger replacement or wastegate repair).
Replacement Cost: N/A — repair only (if caught early; ignored turbo failure can send debris into the engine).
Urgency: Check — book inspection urgently if you hear rattling or notice power loss.

Our recommendation:

The N54's twin turbochargers use wastegate actuators that can develop play over time, causing a characteristic rattle. While not an immediate failure, it indicates wear. BMW extended the warranty on N54 wastegates to 8 years/82,000 miles in some markets. On higher-mileage N54s, turbo replacement is a common expense. The N55's single twin-scroll turbo is more reliable in this regard.

4. Oil Leaks — Valve Cover Gasket & Oil Filter Housing Gasket(N54 & N55)

Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning, visible oil leak from the top or front of the engine.
Typical Mileage: 40,000–80,000 miles (N54 and N55).
Repair Cost: £300–£800 [PLACEHOLDER] (valve cover gasket or oil filter housing gasket replacement).
Replacement Cost: N/A — repair only (if caught early; ignored oil loss can lead to engine damage).
Urgency: Check — book inspection urgently if oil leak is detected.

Our recommendation:

Both N54 and N55 engines are known for oil leaks from the valve cover gasket and oil filter housing gasket (OFHG). The N55's valve cover is particularly prone to warping, requiring full cover replacement. If the OFHG fails, oil can leak onto the serpentine belt, causing it to slip or break — which can then be ingested into the engine through the front crankshaft seal, causing catastrophic failure. A £300–£800 gasket replacement is far cheaper than the consequences of a snapped belt.

5. Water Pump & Thermostat Failure(N54 & N55)

Symptoms: Overheating, coolant loss, engine warning light, electric water pump noise, poor heater performance, the electric water pump may fail without warning.
Typical Mileage: 50,000–80,000 miles.
Repair Cost: £500–£1,000 [PLACEHOLDER] (water pump and thermostat replacement).
Replacement Cost: N/A — repair only (if caught early; ignored overheating can cause head gasket failure).
Urgency: Check — book inspection urgently if overheating or coolant loss occurs.

Our recommendation:

Both N54 and N55 use an electric water pump that is a known wear item. BMW's electric water pumps typically fail between 50,000–80,000 miles, often without warning. When it fails, the engine overheats rapidly — and in an aluminium-block engine, that can mean a warped head or blown head gasket. The thermostat often fails at the same time. A £500–£1,000 preventative replacement is cheaper than a £2,000+ head gasket repair.

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3 Series 335i — Repair, Buy, or Replace?

Not every issue means a new engine.Here’s what can be repaired, when it makes sense, and what to check before you buy.

Can It Be Repaired?

Problem	Repairable?	Typical Cost	When It Makes Sense
HPFP failure (N54)	Yes	£600 – £1,200[PLACEHOLDER]	Worth fixing — a common and well-understood repair
Fuel injector failure (N54)	Yes	£800 – £2,000[PLACEHOLDER]	Replace all six with updated index 12 injectors
Wastegate rattle / turbo failure (N54)	Yes	£1,500 – £3,500[PLACEHOLDER]	Worth fixing on a well-maintained example
Oil leaks (valve cover / OFHG)	Yes	£300 – £800[PLACEHOLDER]	Essential maintenance — always worth doing
Water pump failure (N54/N55)	Yes	£500 – £1,000[PLACEHOLDER]	Routine maintenance on higher‑mileage examples
Major internal failure (crank, bearings)	Usually No	£2,800 – £5,500+	Full engine replacement often more cost‑effective

ProblemRepairable? · Typical Cost

HPFP failure (N54)

Yes£600 – £1,200[PLACEHOLDER]

Worth fixing — a common and well-understood repair

Fuel injector failure (N54)

Yes£800 – £2,000[PLACEHOLDER]

Replace all six with updated index 12 injectors

Wastegate rattle / turbo failure (N54)

Yes£1,500 – £3,500[PLACEHOLDER]

Worth fixing on a well-maintained example

Oil leaks (valve cover / OFHG)

Yes£300 – £800[PLACEHOLDER]

Essential maintenance — always worth doing

Water pump failure (N54/N55)

Yes£500 – £1,000[PLACEHOLDER]

Routine maintenance on higher‑mileage examples

Major internal failure (crank, bearings)

Usually No£2,800 – £5,500+

Full engine replacement often more cost‑effective

Buying This BMW 3 Series 335i? Check These First

Buy if:

Full BMW service history with documented oil changes (every 8,000–10,000 miles)
N54: HPFP replaced with updated part, injectors replaced with index 12 units
N55: Valve cover and OFHG replaced, water pump replaced
Evidence of premium fuel use (98 RON recommended for both engines)

Avoid if:

N54: Any sign of long cranking, misfire, or wastegate rattle
N54: No evidence of HPFP or injector replacement on higher‑mileage cars
N55: Any sign of oil leaks or overheating history
No evidence of regular oil changes — both engines are intolerant of neglect

Closing verdict

The BMW 335i represents a pivotal moment in BMW history — the first mass‑production turbocharged petrol engine (N54) and its refined successor (N55). The N54 offers incredible tuning potential and a sonorous twin‑turbo character, but it comes with well‑documented weaknesses: HPFP, injectors, and turbos. The N55 is more reliable and responsive, with earlier torque delivery, but still suffers from oil leaks and water pump failures. Buy on service history above all else — a well‑maintained 335i of either engine is a rewarding and powerful car; a neglected example can be a financial black hole.

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Buying Checklist

Before you buy a used BMW 3 Series 335i (or before you commit to an engine replacement), check these:

1. Cold Start
Any rattle or wastegate noise? Any long cranking? (HPFP warning on N54)
2. Service History
Regular oil changes (8,000–10,000 miles) — this is non‑negotiable on both engines
3. HPFP / Injector History
N54: Have the HPFP and injectors been replaced with updated parts?
4. Oil Leaks
Check under the vehicle and around the valve cover and oil filter housing
5. Water Pump
Has the electric water pump been replaced? (N54 and N55)
6. Turbo Health
Any rattling, whistling, or loss of boost? (N54 wastegate rattle is common)
7. Running Quality
Any rough idle, hesitation, or misfire? (N54 injector warning)
8. MOT History
Check for emissions‑related failures or any advisory notes

Why this matters

A 10-minute check now can save you thousands later. The right 3 Series 335i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 3 Series 335i (or before you commit to an engine replacement), check these:

1
Cold Start
Any rattle or wastegate noise? Any long cranking? (HPFP warning on N54)
2
Service History
Regular oil changes (8,000–10,000 miles) — this is non‑negotiable on both engines
3
HPFP / Injector History
N54: Have the HPFP and injectors been replaced with updated parts?
4
Oil Leaks
Check under the vehicle and around the valve cover and oil filter housing
5
Water Pump
Has the electric water pump been replaced? (N54 and N55)
6
Turbo Health
Any rattling, whistling, or loss of boost? (N54 wastegate rattle is common)
7
Running Quality
Any rough idle, hesitation, or misfire? (N54 injector warning)
8
MOT History
Check for emissions‑related failures or any advisory notes

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 3 Series 335i pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly.

N54B30 (3.0L Twin-Turbo I6)

Years: 2006–2010
Power: 306 PS (225 kW) / 400 Nm
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £2,800–£4,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
N54B30 (3.0L Twin-Turbo I6)	2006–2010	306 PS (225 kW) / 400 Nm	—(pattern data)	£2,800–£4,500[PLACEHOLDER]
N55B30 (3.0L Twin-Scroll I6)	2010–2015	306 PS (225 kW) / 400 Nm	—(pattern data)	£2,500–£4,500[PLACEHOLDER]

Technical SpecsN55B30 — 3.0L Twin-Scroll

Displacement: 2,979 cc
Cylinders: 6‑cylinder inline
Compression Ratio: 10.2:1
Fuel System: Direct injection
Aspiration: Twin‑turbocharged (parallel)
Valvetrain: DOHC with VVT
Displacement: 2,979 cc
Cylinders: 6‑cylinder inline
Compression Ratio: 10.2:1
Fuel System: Direct injection
Aspiration: Twin‑scroll single turbocharger
Valvetrain: DOHC with VVT

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Market Intelligence

Real data from thousands of 3 Series 335i enquiries in 2025.

Most Common FailureN54: HPFP failure

The defining weakness of the early 335i

Average Enquiry Mileage

60,000–90,000

miles

[PATTERN DATA]

Average Replacement Cost

£3,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

N54B30

The original twin-turbo is more commonly sought

[PATTERN DATA]

Peak Enquiry Season

Autumn/Winter

Cold starts expose HPFP and wastegate issues

[PATTERN DATA]

Regional Demand

South East: 22%
London: 16%
Other Regions: 62%

[PATTERN DATA]

Regional Demand Breakdown

16%London22%South East62%Other Regions

Frequently Asked Questions

A reconditioned 335i engine (N54 or N55) typically costs £2,500–£5,500 supply only depending on engine variant and condition. Fitting adds £1,000–£1,800. A full engine replacement with labour can cost £9,000–£13,000 for premium vehicles. Use our calculator for a figure specific to your vehicle.

It depends on which engine you have. The N54 (2006–2010) is a legendary engine with incredible tuning potential, but it has well‑documented weaknesses: HPFP failure, fuel injector failure, and wastegate rattle. The N55 (2010–2015) is more reliable, with a single twin‑scroll turbo and improved HPFP design, but still suffers from oil leaks and water pump failures. Both engines demand strict maintenance.

On the N54, the most common issues are HPFP failure, fuel injector failure, and wastegate rattle/turbocharger wear. On both N54 and N55, oil leaks (valve cover gasket, oil filter housing gasket) and electric water pump failure are common. The N55's valve cover is prone to warping, requiring full replacement.

Depends on vehicle value and condition. Against a tidy £5,000–£15,000 335i, a £2,800–£5,500 recon is 20–55% of the car's value — often worth it on well‑maintained examples. If the engine has suffered catastrophic failure (e.g., snapped timing chain, seized turbos), a full engine replacement may be necessary. Get a full diagnostic assessment before committing.

The E90/E91/E92/E93 (2006–2010) uses the N54B30 twin‑turbo — look for two turbos under the bonnet. The E90 LCI (2010–2013) and F30/F31 (2011–2015) use the N55B30 twin‑scroll single turbo — look for one turbo with a twin‑scroll housing. The engine code is stamped on the engine block and listed on your V5C.

Most issues — HPFP failure, injector failure, oil leaks, water pump failure — are repairable. On the N54, if turbochargers fail, they can be replaced individually. However, if the engine suffers major internal failure (crankshaft, bearings, severe overheating), a full engine replacement is usually more cost‑effective than a rebuild.

Disclaimer: All prices are indicative UK market ranges based on historical quote data from our network of engine specialists.
Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes.
Every engine supplied through EnginesMarket carries a minimum 12‑month unlimited‑mileage warranty — always confirm terms with your chosen supplier.

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BMW 3 Series 335i Engine Replacement —Compare Prices &Get Quotes

BMW 3 Series 335i — Which Engine Does Your Car Actually Have?

BMW 3 Series 335i Engine Replacement Costs

Common Problems With BMW 3 Series 335i Engines

1. High‑Pressure Fuel Pump (HPFP) Failure — N54(E90, 2006–2010)

2. Fuel Injector Failure — N54(E90, 2006–2010)

3. Wastegate Rattle / Turbocharger Failure — N54(E90, 2006–2010)

4. Oil Leaks — Valve Cover Gasket & Oil Filter Housing Gasket(N54 & N55)

5. Water Pump & Thermostat Failure(N54 & N55)

1. High‑Pressure Fuel Pump (HPFP) Failure — N54(E90, 2006–2010)

2. Fuel Injector Failure — N54(E90, 2006–2010)

3. Wastegate Rattle / Turbocharger Failure — N54(E90, 2006–2010)

4. Oil Leaks — Valve Cover Gasket & Oil Filter Housing Gasket(N54 & N55)

5. Water Pump & Thermostat Failure(N54 & N55)

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3 Series 335i — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This BMW 3 Series 335i? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 3 Series 335i Owners Trust BMWEngines.uk

BMW 3 Series 335i Engine Replacement —Compare Prices &
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