How much does an N54/N55 engine replacement cost?

A reconditioned N54/N55 typically costs £3,500–£5,500 supply only [ESTIMATED], varying by exact variant and year. Fitting adds £650–£1,300 depending on labour rates. Use our calculator for a figure specific to your car.

Is the BMW N54/N55 a reliable engine?

We rate the N54/N55 at 3.5 stars out of 5, based on an 88% confidence level from specialist reports and UK owner surveys [ESTIMATED]. The core engine is strong, but peripheral items (HPFP, injectors, wastegates) are regular failure points.

What is the most common N54/N55 failure?

The high‑pressure fuel pump (HPFP) fails prematurely – often between 60,000–100,000 miles – causing long cranks and loss of power. Injectors (especially index 9/10) also leak and need replacement at similar intervals.

Which BMW models use the N54/N55?

The N54/N55 powered the 135i, 335i, 535i, X3 35i, X5 35i, Z4 sDrive35i, and 740i, across multiple generations. It was BMW’s premier turbo six for over a decade.

How long does the N54/N55 last?

With proper maintenance (regular oil changes, timely HPFP/injector replacement, and attention to cooling), the N54/N55 can easily exceed 150,000 miles. Many high‑mileage examples remain on the road with original engine internals.

BMWN54/N55Petrol3.0L I6 Turbo2006–present

BMW N54/N55 Engine -Specs, Reliability & Replacement Cost

The BMW N54/N55 is a legendary 3.0-litre turbo six – brilliant when sorted, but high-pressure fuel pumps and injectors are well-known weak points. Backed by real UK enquiry data [ESTIMATED].

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BMW N54/N55 Engine -Specs, Reliability & Replacement Cost

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100+
Enquiries
[ESTIMATED]
12+
Models (BMW)
Fitted
[Score]/100 Engine Score
Part of Engine Finders

BMW N54 / N55 Engine Overview

All the essential specifications, performance data, and compatibility information at a glance.

Engine Family

BMW N54 / N55

Fuel

Petrol

Power Range

306–340 hp (standard)

BMW-VERIFIED

Overall Engine Score

[Score]/100/

★★★★☆

Configuration / Displacement

3.0L I6 Turbo (twin-scroll on N55)

Modern turbodiesel four-cylinder engine with proven architecture.

Years Produced

2006–present (N54: 2006–2013, N55: 2009–present)

Over a decade of production and continuous development.

Models Fitted (BMW only)

Fitted across a wide range of BMW vehicles and body styles.

Cross-Brand Fitment

Exclusive to BMW

The N47 engine is engineered exclusively for BMW vehicles.

BMW-Verified Data

Verified using real UK enquiries and workshop data.

Real-World Insights

Based on 1,450+ UK enquiries in 2025.

Trusted by Enthusiasts

Part of Engine Finders - UK's leading engine specialists.

Quality You Can Trust

Every engine is checked, inspected and quality assured.

Engine Family

BMW N54 / N55

Fuel

Petrol

Configuration /
Displacement

3.0L I6 Turbo (twin-scroll on N55)

Power Range

306–340 hp (standard)

BMW-VERIFIED

Years Produced

2006–present (N54: 2006–2013, N55: 2009–present)

Models Fitted (BMW only)

Cross-Brand Fitment

Exclusive to BMW

Overall Engine Score

[Score]/100/

★★★★☆

Verdict & Rating

Rating:

3.5

out of 5

88% – based on cross-referenced specialist reports and UK owner surveys.

The N54/N55 is a tuner’s dream with huge potential -but HPFP, injector and wastegate issues are common -buy only with full service history and recent injector codes.

Best for:

Enthusiasts who appreciate effortless power and are comfortable with proactive maintenance.

Avoid if:

You can’t afford the running costs of a high-performance turbo six, or you expect Toyota-like reliability without attention.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

Star rating (3.5★) × 4 = 14

14 /20

Repair Cost

Reconditioned supply midpoint ~£3,500–£5,500 → 16

16 /20

Repairability

Many common failures (HPFP, injectors, coils) are replaceable, but wastegate rattle often requires turbo overhaul or replacement – labour-intensive

12 /20

Parts Supply

Excellent OEM and aftermarket support; HPFP and injectors are widely available, though index-12 injectors are pricey

16 /20

Replacement Economics

Recon cost ~45–60% of lowest vehicle value (e.g. older E90 335i) → 12

12 /20

Total Engine Score

70 / 100

Rating:

3.5

out of 5

88% – based on cross-referenced specialist reports and UK owner surveys.

The N54/N55 is a tuner’s dream with huge potential -but HPFP, injector and wastegate issues are common -buy only with full service history and recent injector codes.

Engine Score breakdown:

DimensionScore (of 20)

Reliability

Star rating (3.5★) × 4 = 14

14 /20

Repair Cost

Reconditioned supply midpoint ~£3,500–£5,500 → 16

16 /20

Repairability

Many common failures (HPFP, injectors, coils) are replaceable, but wastegate rattle often requires turbo overhaul or replacement – labour-intensive

12 /20

Parts Supply

Excellent OEM and aftermarket support; HPFP and injectors are widely available, though index-12 injectors are pricey

16 /20

Replacement Economics

Recon cost ~45–60% of lowest vehicle value (e.g. older E90 335i) → 12

12 /20

Total Engine Score

70 / 100

Best for:

Enthusiasts who appreciate effortless power and are comfortable with proactive maintenance.

Avoid if:

You can’t afford the running costs of a high-performance turbo six, or you expect Toyota-like reliability without attention.

Compatible BMW Models

BMW N54 / N55 engines are fitted across 0+ models from 2006–2013.

BMW Exclusive Engine

This is an exclusive BMW engine. No cross-platform sharing.

2006

7 Years of Production

2013

Other BMW Models

N54 / N55 also appears in limited variants and markets.

View full details →

Compatibility Verified

All compatibility data verified from BMW parts catalogues and specialist databases. [BMW-VERIFIED]

Other BMW Models

N54 / N55 also appears in limited variants and markets.

View full details ›

Compatibility Verified

All compatibility data verified from BMW parts catalogues and specialist databases. [BMW-VERIFIED]

Exclusive to BMW – no cross-brand fitment.

BMW N54 / N55 Engine Price Guide

All prices are estimates from UK specialists [BMW-QUOTE]

Fitting an N54/N55 typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [ESTIMATED].

(Exclusive mode – no cross-link)

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BMW N54 / N55 Engine Price Guide

All prices are estimates from UK specialists

[BMW-QUOTE]

Fitting an N54/N55 typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer) [ESTIMATED].

(Exclusive mode – no cross-link)

Compare BMW N54 / N55 engine prices from UK specialists

Frequently Asked Questions

Expert answers to the most common BMW N54 / N55 engine questions.

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