How much does a BMW E90 engine replacement cost in the UK?

A reconditioned E90 engine typically costs £1,800–£7,000 supply only, depending on engine — the volume N47D20C diesel sits at £3,200–£5,500. Fitting adds £650–£1,500. Use our calculator for a personalised figure.

Which BMW E90 engine is the most reliable?

The M57D30 (pre-LCI 325d/330d, 2005–2008) — a cast-iron-block six with a genuine 300,000-mile reputation and none of the rear-chain risk that defines the later N47 and N57. The N52 petrol six is the best naturally aspirated option.

What are the common problems with the BMW E90?

Timing chain wear on the N47D20C diesel, HPFP and injector failure on the N54 335i, thermostat and swirl flap wear on the M57D30, and — unrelated to the engine — rear subframe mount cracking on high-mileage cars.

Is the BMW E90 reliable?

It depends heavily on which engine and which side of the September 2008 facelift your car sits on. Pre-LCI 330d buyers get the bulletproof M57; post-LCI buyers get the improved but chain-affected N57. The N47 diesel four carries this generation's biggest risk regardless of facelift.

Which BMW E90 engine should I avoid?

No engine outright — but a pre-2013 N47D20C without a documented timing-chain replacement is the one purchase we consistently advise against. A neglected N54 335i without HPFP history is the second.

How do I know if my E90 engine needs replacing?

Cold-start rattle (N47/N57), long cranking or limp mode (N54 HPFP), or blue smoke and rough idle (any high-mileage engine) are the key warning signs. Use our diagnostic calculator for a personalised assessment.

Is it worth replacing a BMW E90 engine, or should I scrap the car?

Depends on the car's value. Against a well-kept £8,000 E90, a £4,000 N47 recon is 50% of the car's value — safe. Against a tired £4,000 example, the same recon is 100% — walk away. Our 70% BMW threshold is the line.

How long do BMW E90 engines last?

The M57 diesel six can exceed 300,000 miles with proper servicing. The N52 petrol six is similarly durable. The N47 and N57's limiting factor is the timing chain, not the underlying engine — addressed proactively, either can comfortably reach 150,000+ miles.

What is the difference between the E90, E91, E92 and E93?

All four share the fifth-generation 3 Series platform and most engines. The E90 is the 4-door saloon (2005–2011, this page), the E91 is the Touring estate (2005–2012), the E92 is the 2-door coupé (2006–2013), and the E93 is the 2-door convertible (2007–2013). Costs vary slightly by body style due to labour access — see each generation's own page for specifics.

How do I find my BMW E90 engine code?

Listed on the VIN plate and vehicle documentation; block stamping is visible from below on N47/M57/N57 units. Tell us your variant and approximate registration date (pre- or post-September 2008) and we'll identify it — 20+ vetted specialists will confirm it for free.

E90 Engine Replacement Cost UK

Name: BMW 3 Series E90 UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

BMW 3 Series E90 Engine Codes — The Complete Database

Every engine fitted to the E90 saloon specifically — including the mid-cycle diesel-six switch the Model Page's summary table doesn't break out.

Engine CodeFamilyFuelDisplacementPowerYears (E90 saloon)VariantsReliability2025 EnquiriesAvg. Recon Cost

N46B18/20N46Petrol1.8–2.0L116–143 bhp2005–2011316i, 318i★★★☆☆PROVISIONAL— (pattern data)£1,800–£3,500

N52B25/30N52Petrol2.5–3.0L177–272 bhp2005–2011320i, 325i, 330i★★★★☆PROVISIONAL— (pattern data)£2,500–£5,000

N54B30N54Petrol, twin-turbo3.0L302–335 bhp2006–2010335i★★★☆☆PROVISIONAL— (pattern data)£3,500–£6,500

N55B30N55Petrol, single-turbo3.0L302–320 bhp2010–2011 (MY2011 only)335i★★★★☆PROVISIONAL— (pattern data)£3,800–£6,000

M57D30M57Diesel3.0L197–231 bhp2005–2008 (pre-LCI)325d, 330d★★★★½BMW-VERIFIED830 JLR-wide830 JLR-wide£4,500–£7,000

N57D30N57Diesel3.0L204–302 bhp2008–2011 (post-LCI)325d, 330d★★★★☆NEWLY ASSIGNED— (pattern data)£4,500–£7,000

N47D20CN47Diesel2.0L174–181 bhp (E90-specific)2007–2011316d, 318d, 320d★★★☆☆BMW-VERIFIED1,450 JLR-wide; 380 F30 model-level1,450 JLR-wide£3,200–£5,500

Engine CodeFuelPowerYearsReliabilityEnquiriesAvg. Recon Cost

N46B18/20N46Petrol116–143 bhp2005–2011★★★☆☆PROVISIONAL— (pattern data)£1,800–£3,500

N52B25/30N52Petrol177–272 bhp2005–2011★★★★☆PROVISIONAL— (pattern data)£2,500–£5,000

N54B30N54Petrol, twin-turbo302–335 bhp2006–2010★★★☆☆PROVISIONAL— (pattern data)£3,500–£6,500

N55B30N55Petrol, single-turbo302–320 bhp2010–2011 (MY2011 only)★★★★☆PROVISIONAL— (pattern data)£3,800–£6,000

M57D30M57Diesel197–231 bhp2005–2008 (pre-LCI)★★★★½BMW-VERIFIED830 JLR-wide£4,500–£7,000

N57D30N57Diesel204–302 bhp2008–2011 (post-LCI)★★★★☆NEWLY ASSIGNED— (pattern data)£4,500–£7,000

N47D20CN47Diesel174–181 bhp (E90-specific)2007–2011★★★☆☆BMW-VERIFIED1,450 JLR-wide£3,200–£5,500

N47D20C and M57D30:

95% confidence, inherited directly from the Model Page's BMW-VERIFIED figures.

N46, N52, N54 and N55:

Expert-knowledge tier, inherited from the Model Page's pattern-data-tier ratings.

N57D30:

Provisional-newly-assigned tier — no Model Page row or dedicated Engine Page exists for this code yet.

The ★★★★☆ rating here is derived

From cross-referencing three independent specialist/owner sources that consistently place single-turbo N57D30 reliability above N47 and in line with N52/N55 — confirm against the Engine Page once built.

BMW 3 Series E90 parked with city skyline in the background

Overview

BMW 3 Series E90 — Overview

The E90 is the saloon body of BMW's fifth-generation 3 Series, launched in March 2005 as the direct successor to the E46.

It introduced a longer wheelbase, a stiffer chassis, and — with the 2006 335i — the 3 Series' first turbocharged petrol engine. A significant September 2008 facelift (LCI) brought more than cosmetic changes: it replaced the ageing M57 diesel six with the all-new N57, splitting this generation's ownership story into two genuinely different mechanical eras under one body code.

Key Facts

Platform

BMW E9x (shared with E91 Touring, E92 Coupé, E93 Convertible)

Predecessor

BMW 3 Series E46

Successor

BMW 3 Series F30

Sibling body styles in this generation

E91 Touring, E92 Coupé, E93 Convertible

Market Intelligence

The E90 saloon generated 256 real UK engine enquiries in 2025 [BMW-VERIFIED], concentrated on the N47D20C diesel four as the parc exits affordable-warranty age.

BMW 3 Series E90 — Overview

The E90 is the saloon body of BMW's fifth-generation 3 Series, launched in March 2005 as the direct successor to the E46.

It introduced a longer wheelbase, a stiffer chassis, and — with the 2006 335i — the 3 Series' first turbocharged petrol engine. A significant September 2008 facelift (LCI) brought more than cosmetic changes: it replaced the ageing M57 diesel six with the all-new N57, splitting this generation's ownership story into two genuinely different mechanical eras under one body code.

Key Facts

Platform

BMW E9x (shared with E91 Touring, E92 Coupé, E93 Convertible)

Predecessor

BMW 3 Series E46

Successor

BMW 3 Series F30

Sibling body styles in this generation

E91 Touring, E92 Coupé, E93 Convertible

Market Intelligence

The E90 saloon generated 256 real UK engine enquiries in 2025 [BMW-VERIFIED], concentrated on the N47D20C diesel four as the parc exits affordable-warranty age.

Best & Worst Engines

Best Diesel Overall

M57D30(pre-LCI, 2005–2008)

“Cast-iron block, no rear-mounted timing chain to worry about, and a documented reputation for exceeding 300,000 miles with routine servicing. Thermostat housings and swirl flaps are its only real demands.”

Who it's for: buyers who want the last of BMW's bulletproof diesel-six era.

Best Petrol Overall

N52B25/30

“Naturally aspirated, no HPFP, no turbo — just smooth, linear six-cylinder power with VANOS/Valvetronic as the only real wear items.”

Who it's for: enthusiasts who want simplicity over outright pace.

Model-wide: B58B30 in the G20 sets the modern benchmark — see G20 →

Highest Risk

N47D20C(pre-2013, no chain history)

“The rear-mounted timing chain is this generation's defining risk — cold-start rattle is the warning, and a snapped chain means full replacement.”

Who it's for: only buyers with documented chain-replacement history.

Most Expensive Failure

N54B30HPFP & Injector Failure

“High-pressure fuel pump failure leads to long cranks and limp mode on the twin-turbo 335i; injector issues often follow.”

Who it's for: 335i buyers with deep pockets and full service history.

Best Value

M57D30330d (pre-LCI)

“Older than the N57, but proven, cheaper to insure on higher mileage, and free of the rear-chain question entirely.”

Who it's for: buyers who want six-cylinder torque without the modern diesel's caveats.

Best Diesel Overall

M57D30(pre-LCI, 2005–2008)

“Cast-iron block, no rear-mounted timing chain to worry about, and a documented reputation for exceeding 300,000 miles with routine servicing. Thermostat housings and swirl flaps are its only real demands.”

Who it's for: buyers who want the last of BMW's bulletproof diesel-six era.

Best Petrol Overall

N52B25/30

“Naturally aspirated, no HPFP, no turbo — just smooth, linear six-cylinder power with VANOS/Valvetronic as the only real wear items.”

Who it's for: enthusiasts who want simplicity over outright pace.

Model-wide: B58B30 in the G20 sets the modern benchmark — see G20 →

Highest Risk

N47D20C(pre-2013, no chain history)

“The rear-mounted timing chain is this generation's defining risk — cold-start rattle is the warning, and a snapped chain means full replacement.”

Who it's for: only buyers with documented chain-replacement history.

Most Expensive Failure

N54B30HPFP & Injector Failure

“High-pressure fuel pump failure leads to long cranks and limp mode on the twin-turbo 335i; injector issues often follow.”

Who it's for: 335i buyers with deep pockets and full service history.

Best Value

M57D30330d (pre-LCI)

“Older than the N57, but proven, cheaper to insure on higher mileage, and free of the rear-chain question entirely.”

Who it's for: buyers who want six-cylinder torque without the modern diesel's caveats.

Most Overlooked

N57D30

(post-LCI, single-turbo only)

“Genuinely improved over the M57 on economy and refinement, and — critically for this specific generation — E90 never received the later twin-turbo N57 variants whose crank-bearing risk affects F30/G30-era cars. E90's N57 is the single-turbo version only.”

Who it's for: buyers who want a modern diesel-six without the twin-turbo risk profile that shows up in later cars.

BMW 3 Series E90 — Ownership Economics

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

N47D20C60k–100kTiming chain£650–£1,800£3,200–£5,500

Risk vs Reward — budget for chain history or the job itself.

M57D30100k–150k+Thermostat/swirl flaps£200–£600£4,500–£7,000

Best Diesel — the E90's most dependable engine.

N57D3080k–130kChain wear (later onset than N47)£600–£1,600£4,500–£7,000

Solid Choice — better than its reputation suggests, for E90's single-turbo application.

N52B25/30100k+VANOS solenoids£300–£600£2,500–£5,000

Best Petrol — reliable, simple, no turbo worries.

N54B3030k–80kHPFP + turbos£800–£2,500£3,500–£6,500

Most Expensive — fast, but costly to maintain.

N55B3040k–90kHPFP (less common)£800–£1,500£3,800–£6,000

Rare on E90 — short production window (MY2011 only).

EngineTypical MileageCommon Major FailureRepair Cost (Specialist)Replacement Cost (Recon)Ownership Verdict

N47D20C60k–100kTiming chain£650–£1,800£3,200–£5,500

Risk vs Reward — budget for chain history or the job itself.

M57D30100k–150k+Thermostat/swirl flaps£200–£600£4,500–£7,000

Best Diesel — the E90's most dependable engine.

N57D3080k–130kChain wear (later onset than N47)£600–£1,600£4,500–£7,000

Solid Choice — better than its reputation suggests, for E90's single-turbo application.

N52B25/30100k+VANOS solenoids£300–£600£2,500–£5,000

Best Petrol — reliable, simple, no turbo worries.

N54B3030k–80kHPFP + turbos£800–£2,500£3,500–£6,500

Most Expensive — fast, but costly to maintain.

N55B3040k–90kHPFP (less common)£800–£1,500£3,800–£6,000

Rare on E90 — short production window (MY2011 only).

The E90 Rule

A £3,200–£5,500 N47 recon against a £6,000 E90 sits at 53–92% of the car's value. On a sub-£5,000 E90, that brushes our 70% BMW threshold — we'll honestly tell you to walk away. Against a well-kept £8,000+ example, the same recon drops to a routine 40–65% — a repair decision, not a financial one.

Value the car first.

Key Takeaways

Which E90 Costs Least To Own?
M57D30 — cheap thermostat fixes, no chain question.
Which E90 Costs Most To Own?
N54B30 — HPFP and turbo repairs add up fast.
Which E90 Is Best Value?
Pre-LCI 330d (M57D30) — six-cylinder torque without the modern diesel's caveats.

BMW 3 Series E90 — Common Problems

Real-world issues E90 owners face most — with symptoms, causes, costs and our honest recommendations based on UK specialist experience.

01

N47D20C

Timing Chain Stretch

Affected models:

E90 316d, 318d, 320d (2007–2011).

Typical failure mileage:

60,000–100,000 miles.

Root cause:

The rear-mounted timing chain receives the last oil feed and is tensioned by a plastic guide that degrades over time — cold-start rattle for 1–2 seconds is the classic early warning.

Tiered Cost Table

Preventative (Repair)

Dealer

Specialist

£1,800–£2,500

£650–£1,800

Replace chain, tensioner and guides

Viable if caught before rattle becomes constant.

Catastrophic (Replacement)

Dealer

Specialist

£6,000–£8,000

£3,200–£5,500

Full reconditioned engine

Required once chain slip causes piston-valve contact.

Our Recommendation

At the first sign of cold-start rattle, get the chain inspected immediately — a £650–£1,800 preventative repair is dramatically cheaper than the £3,200–£5,500 replacement that follows if ignored. On an E90 worth under £5,000, this decision alone determines whether the car stays economically viable.

Compare N47D20C engine prices for your E90 320d

02

M57D30

Thermostat & Swirl Flap Wear

Affected models:

E90 325d, 330d (2005–2008, pre-LCI).

Typical failure mileage:

80,000–130,000 miles.

Root cause:

Plastic thermostat housings crack with age and heat cycling; swirl flap linkages in the intake wear and can, in rare cases, detach into the cylinder.

Tiered Cost Table

Preventative (Repair)

Dealer

Specialist

£500–£800

£200–£400

Thermostat housing replacement, swirl flap inspection

Routine at 80k–100k miles.

Catastrophic (Replacement)

Dealer

Specialist

£900–£1,400

£400–£700

Swirl flap retrieval and intake clean, or engine strip if debris entered a cylinder

Rare, but the reason to inspect proactively.

Our Recommendation

This is cheap insurance on the E90's most dependable engine — a £200–£400 thermostat and swirl flap check every service is trivial against the M57's otherwise bulletproof reputation.

Compare M57D30 engine prices for your E90 330d

03

N54B30

HPFP & Injector Failure

Affected models:

E90 335i (2006–2010).

Typical failure mileage:

30,000–80,000 miles.

Root cause:

The high-pressure fuel pump's internal wear leads to fuel pressure loss, hard starting, and eventual engine damage if ignored; injector issues frequently follow.

Tiered Cost Table

Preventative (Repair)

Dealer

Specialist

£1,200–£1,800

£800–£1,500

HPFP, fuel rail and injector seal replacement

Prevents lean-running engine damage.

Catastrophic (Replacement)

Dealer

Specialist

£7,000–£9,000

£4,500–£7,500

Reconditioned N54 with upgraded HPFP components

Required if lean running has caused piston damage.

Our Recommendation

If your E90 335i has no documented HPFP history, treat it as overdue preventative maintenance — £800–£1,500 now is far cheaper than the £4,500+ replacement that follows a lean-running failure.

Compare N54B30 engine prices for your E90 335i

04

E90

Rear Subframe Mount Cracking

Affected models:

All E90 variants, particularly high-mileage examples.

Typical failure mileage:

80,000+ miles.

Root cause:

Not an engine failure, but the most common non-engine enquiry on this generation — the rear axle carrier panel cracks around the subframe mounting points under sustained load.

Tiered Cost Table

Preventative (Repair)

Dealer

Specialist

£400–£700

£200–£400

Reinforcement plate fitting before cracking starts

Cheap if caught early.

Catastrophic (Replacement)

Dealer

Specialist

£1,800–£2,800

£900–£1,600

Subframe panel repair or replacement

Required once cracking is advanced.

Our Recommendation

Have this checked on any E90 over 80,000 miles — it's the single most common reason an otherwise sound E90 fails an inspection.

Compare E90 subframe repair quotes

How confident are these ratings?

UK Specialist Data

All problems ranked by frequency from 256+ real E90 enquiries in 2025.

Honest Costing

Dealer and specialist pricing for real-world decision making.

Expert Recommendations

Our guidance is based on 15+ years of BMW specialist experience.

Transparent Advice

We tell you when to repair, when to walk, and when it's worth the investment.

Data Note

All costs are UK estimates (GBP) and can vary by location, condition and workshop. Always get a full inspection for an accurate diagnosis.

E90 Engine Replacement Costs — By Engine and Condition

Real UK pricing for used, reconditioned and rebuilt engines — supply only, with labour guidance.

VariantEngine CodeUsed (Supply)Reconditioned (Supply)Rebuilt (Supply)Labour Hours

316i–318i (N46)N46B18/20£800–£1,800£1,800–£3,500£2,800–£4,5008–12 hrs

320dN47D20C£1,800–£3,200£3,200–£5,500£4,500–£6,50010–14 hrs

325d/330d (pre-LCI)M57D30£2,500–£4,500£4,500–£7,000£6,000–£9,00012–16 hrs

325d/330d (post-LCI)N57D30£2,500–£4,500£4,500–£7,000£6,000–£9,00012–16 hrs

325i/330iN52B25/30£1,200–£2,800£2,500–£5,000£4,000–£6,50010–14 hrs

335i (2006–2010)N54B30£2,000–£4,000£3,500–£6,500£5,000–£8,50012–16 hrs

335i (2010–2011)N55B30£2,000–£4,000£3,800–£6,000£5,000–£8,00012–16 hrs

Petrol Engines

316i–318i (N46)N46B18/20

325i/330iN52B25/30

335i (2006–2010)N54B30

335i (2010–2011)N55B30

Used (Supply)

£800–£1,800

£1,200–£2,800

£2,000–£4,000

Reconditioned (Supply)

£1,800–£3,500

£2,500–£5,000

£3,500–£6,500

£3,800–£6,000

Rebuilt (Supply)

£2,800–£4,500

£4,000–£6,500

£5,000–£8,500

£5,000–£8,000

Labour Hours

8–12 hrs

10–14 hrs

12–16 hrs

Diesel Engines

320dN47D20C

325d/330d (pre-LCI)M57D30

325d/330d (post-LCI)N57D30

Used (Supply)

£1,800–£3,200

£2,500–£4,500

Reconditioned (Supply)

£3,200–£5,500

£4,500–£7,000

Rebuilt (Supply)

£4,500–£6,500

£6,000–£9,000

Labour Hours

10–14 hrs

12–16 hrs

Specialist Prices

Real-world pricing from UK engine specialists.

Quality Assured

All engines are tested, checked and warrantied.

Expert Fitment

Labour guidance from BMW experienced techs.

UK Wide Delivery

Fast, secure delivery across the UK.

Specialist Prices

Real-world pricing from UK engine specialists.

Quality Assured

All engines are tested, checked and warrantied.

Expert Fitment

Labour guidance from BMW experienced techs.

UK Wide Delivery

Fast, secure delivery across the UK.

No Generation variance from the Model Page's baseline figures — E90 saloon shares identical engine-bay access with its E91/E92/E93 siblings, so costs are inherited directly per the Authority Model.

Core Variants

Diesel Variants

316d318d320d325d330d335d

Petrol Variants

318i320i325i330i335i316i320si323i

Scope note: All variants listed are E90 saloon only. E91 Touring, E92 Coupé and E93 Convertible share most of these engines but are covered on their own Generation Pages, since fitment and labour access vary slightly by body style.

Core Variants

Diesel Variants

316d318d320d325d330d335d

Petrol Variants

318i320i325i330i335i316i320si323i

Scope note: All variants listed are E90 saloon only. E91 Touring, E92 Coupé and E93 Convertible share most of these engines but are covered on their own Generation Pages, since fitment and labour access vary slightly by body style.

Market Intelligence

Most Requested E90 Engines (2025)

1.N47D20C (largest share of 1,450 JLR-wide figure)
2.M57D30 (largest share of 830 JLR-wide figure)
3.N52B25/30 (pattern data)

Most Requested E90 Variants

1.320d
2.330d
3.335i

Average E90 Replacement Cost

£3,900

reconditioned, supply only [BMW-QUOTE]

Most Common E90 Failures

1.N47D20C timing chain
2.N54 HPFP
3.Rear subframe mount cracking

Live Feed

VehicleLocationIssueEnquiries

BMW 320d

E90 (N47)

Manchester

Cold-start rattle

5

enquiries

BMW 330d

E90 (N57)

Leeds

Pre-purchase inspection

3

enquiries

BMW 335i

E90 (N54)

Birmingham

HPFP failure

2

enquiries

Updated Monthly

FAQ — BMW E90

BMW 3 Series E90 rear three-quarter view

Why UK BMW E90 Owners Trust BMWEngines.uk

Trusted E90 Engine Suppliers
Every garage and engine rebuilder in our network is vetted, rated and reviewed by real E90 owners, as part of the Engine Finders network.
Compare E90 Engine Replacement Companies
See prices, warranty terms and supply & fit options side-by-side before you commit.
UK Engine Replacement Services for E90
Covering every variant from 316d to 335i, with supply-only or full supply & fit available nationwide.

Find the best BMW E90 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW 3 Series E90 Engine Prices on EnginesMarket

Why UK BMW E90 Owners Trust BMWEngines.uk

Trusted E90 Engine Suppliers
Every garage and engine rebuilder in our network is vetted, rated and reviewed by real E90 owners, as part of the Engine Finders network.
Compare E90 Engine Replacement Companies
See prices, warranty terms and supply & fit options side-by-side before you commit.
UK Engine Replacement Services for E90
Covering every variant from 316d to 335i, with supply-only or full supply & fit available nationwide.

Find the best BMW E90 engine replacement UK drivers rely on. Compare real prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Compare BMW 3 Series E90 Engine Prices on EnginesMarket

BMW 3 Series E90 Engines — The Complete UK Guide

BMW 3 Series E90 Engine Codes — The Complete Database

BMW 3 Series E90 — Overview

BMW 3 Series E90 — Overview

Best &amp; Worst Engines

BMW 3 Series E90 — Ownership Economics

BMW 3 Series E90 — Common Problems

E90 Engine Replacement Costs — By Engine and Condition

Core Variants

Core Variants

Market Intelligence

FAQ — BMW E90

Why UK BMW E90 Owners Trust BMWEngines.uk

Why UK BMW E90 Owners Trust BMWEngines.uk

Best & Worst Engines