How much does a BMW 4 Series F32 engine replacement cost in the UK?

A reconditioned F32 engine typically costs £1,800–£9,000 supply only [BMW-QUOTE], depending on engine -the B38 1.5-litre three-cylinder petrol sits at £1,800–£3,200, while the S55 M4 engine can reach £5,000–£9,000. Fitting adds £520–£1,300. Use our calculator for a personalised figure.

What are the common problems with the BMW 4 Series F32?

Timing chain stretch on the N20 petrols (pre-LCI 420i/428i) and N47 diesel (pre-LCI 420d), water pump and cooling system failures on the B58 (440i), crank hub spinning on the S55 (M4), carbon build-up on the N55 (435i), and -unrelated to the engine -boot wiring loom fractures on all F32s.

Is the BMW 4 Series F32 reliable?

It depends heavily on the engine and model year. LCI models (2016 onwards) with B48 or B58 engines are considered very reliable -these are BMW's latest-generation modular engines with proven durability. Pre-LCI N20 and N47 engines carry the timing chain risk, so a documented chain replacement is essential. The S55 in the M4 is a robust high-performance engine but the crank hub is a known weak point on tuned cars. A well-maintained F32 with the right engine can be a reliable executive coupé.

Which F32 engine should I avoid?

No engine outright -but the pre-LCI N20 (420i/428i, 2013–2016) and N47 (420d, 2013–2015) without documented timing chain history are the ones we consistently advise against. The S55 M4 is a fantastic engine but budget for crank hub preventative work if you plan to tune it. For most buyers, a LCI model with the B48 or B58 represents the safest choice.

How do I know if my F32 engine needs replacing?

Key warning signs: cold-start rattle (N20 or N47 timing chain), overheating or coolant loss (B58 water pump), loss of power or rough running (carbon build-up on N55), crank hub failure (S55 -engine warning light, loss of power), or persistent DPF issues (diesel engines). Use our diagnostic calculator for a personalised assessment.

Is it worth replacing an F32 engine, or should I scrap the car?

Depends on the car's value. Against a well-kept £15,000 F32, a £3,200–£5,800 B58 recon is 20–40% of the car's value -safe. Against a tired £6,000 example, the same recon is 50–95% -walk away. Our 70% BMW threshold is the line: if the lowest viable replacement cost exceeds 70% of the vehicle's current market value, evaluate scrap value first.

How long do F32 engines last?

The B58 straight-six and B48 four-cylinder routinely exceed 150,000–200,000 miles with proper servicing (regular oil changes, cooling system maintenance). The N55 is similarly durable but carbon build-up requires periodic cleaning. The S55 can also be long-lived but the crank hub is the limiting factor -addressed proactively, it can comfortably reach 150,000+ miles. The N20 and N47 diesels can also reach high mileages but the timing chain must be addressed proactively.

What is the difference between the F32, F33 and F36?

All three share the first-generation 4 Series platform and most engines. The F32 is the 2-door coupé (2013–2020, this page), the F33 is the 2-door convertible (2013–2020), and the F36 is the 4-door Gran Coupé (2014–2020). Costs vary slightly by body style due to labour access and convertible-specific components -see each generation's own page for specifics.

How do I find my BMW F32 engine code?

Listed on the VIN plate and vehicle documentation; the engine number is stamped on the block -on four-cylinder engines (N20, B48, N47, B47) it's on the left-hand side; on six-cylinder engines (N55, B58, N57, S55) it's on the front of the block near the timing cover. Tell us your variant and approximate registration date and we'll identify it -20+ vetted BMW specialists will confirm it for free.

F32 Engine Replacement Cost UK -Compare Quotes

BMW 4 Series F32 Engine Codes -The Complete Database

Every engine fitted to the first‑generation 4 Series Coupé (F32) specifically -from the July 2013 launch to the September 2020 end of production.

Engine CodeFamilyFuelDisplacementPowerYears (F32)Variants (badges)Reliability2025 EnquiriesAvg. Recon Cost

B38B15B38Petrol, turbo I31.5L80 kW / 109 hp2016–2020418i★★★★☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£1,800–£3,200 [BMW-QUOTE]

N20B20U0N20Petrol, turbo I42.0L135 kW / 184 hp2013–2016420i★★★☆☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,000–£3,500 [BMW-QUOTE]

N20B20O0N20Petrol, turbo I42.0L180 kW / 245 hp2013–2016428i★★★☆☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,200–£4,000 [BMW-QUOTE]

B48B20B48Petrol, turbo I42.0L135–185 kW / 184–252 hp2016–2020420i, 430i★★★★☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,200–£4,200 [BMW-QUOTE]

N55B30N55Petrol, turbo I63.0L225 kW / 306 hp2013–2016435i★★★½☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,800–£5,000 [BMW-QUOTE]

B58B30B58Petrol, turbo I63.0L240 kW / 326 hp2016–2020440i★★★★½ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£3,200–£5,800 [BMW-QUOTE]

S55B30T0S55Petrol, twin‑turbo I63.0L317–331 kW / 425–444 hp2014–2020M4, M4 Competition★★★★☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£5,000–£9,000 [BMW-QUOTE]

N47D20N47Diesel, turbo I42.0L135 kW / 184 hp2013–2015420d★★★☆☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,500–£4,500 [BMW-QUOTE]

B47D20B47Diesel, turbo I42.0L140 kW / 190 hp2015–2020420d★★★★☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,500–£4,800 [BMW-QUOTE]

N57D30N57Diesel, turbo I63.0L170–230 kW / 231–313 hp2013–2020425d, 430d, 435d★★★½☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£3,000–£5,500 [BMW-QUOTE]

Engine CodeFuelPowerYearsReliabilityEnquiriesAvg. Recon Cost

B38B15B38Petrol, turbo I380 kW / 109 hp2016–2020★★★★☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£1,800–£3,200 [BMW-QUOTE]

N20B20U0N20Petrol, turbo I4135 kW / 184 hp2013–2016★★★☆☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,000–£3,500 [BMW-QUOTE]

N20B20O0N20Petrol, turbo I4180 kW / 245 hp2013–2016★★★☆☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,200–£4,000 [BMW-QUOTE]

B48B20B48Petrol, turbo I4135–185 kW / 184–252 hp2016–2020★★★★☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,200–£4,200 [BMW-QUOTE]

N55B30N55Petrol, turbo I6225 kW / 306 hp2013–2016★★★½☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,800–£5,000 [BMW-QUOTE]

B58B30B58Petrol, turbo I6240 kW / 326 hp2016–2020★★★★½ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£3,200–£5,800 [BMW-QUOTE]

S55B30T0S55Petrol, twin‑turbo I6317–331 kW / 425–444 hp2014–2020★★★★☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£5,000–£9,000 [BMW-QUOTE]

N47D20N47Diesel, turbo I4135 kW / 184 hp2013–2015★★★☆☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,500–£4,500 [BMW-QUOTE]

B47D20B47Diesel, turbo I4140 kW / 190 hp2015–2020★★★★☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£2,500–£4,800 [BMW-QUOTE]

N57D30N57Diesel, turbo I6170–230 kW / 231–313 hp2013–2020★★★½☆ [PROVISIONAL -pending dedicated Engine Page][PATTERN DATA]£3,000–£5,500 [BMW-QUOTE]

Overview

BMW 4 Series F32 -Overview

The F32 is the first‑generation BMW 4 Series Coupé, launched in October 2013 as the successor to the E92 3 Series Coupé.

BMW's decision to spin off the coupé and convertible models into a separate 4 Series lineage reflected a strategic shift to differentiate the two‑door variants from the more practical saloon and estate models. Built on the same L7 platform as the F30 3 Series, the F32 offered a lower, wider stance and sharper handling. Under the bonnet, buyers could choose from a comprehensive range of petrol and diesel engines -four‑cylinder and six‑cylinder, from the entry‑level 418i to the fire‑breathing M4 Competition. A May 2016 facelift brought updated engines, with the N20 and N55 replaced by the more reliable B48 and B58. Production ran until September 2020, when the G22 second generation replaced it.

Key Facts

Platform

BMW L7 (shared with F30 3 Series)

Predecessor

BMW E92/E93 3 Series Coupé/Convertible

Successor

BMW G22 4 Series

Sibling body styles in this generation

F33 (convertible), F36 (Gran Coupé)

Market Intelligence

The F32 generates consistent UK enquiries [PATTERN DATA], concentrated on 420d and 430i/440i petrol variants as these executive coupés enter affordable‑maintenance territory.

BMW 4 Series F32 -Overview

The F32 is the first‑generation BMW 4 Series Coupé, launched in October 2013 as the successor to the E92 3 Series Coupé.

BMW's decision to spin off the coupé and convertible models into a separate 4 Series lineage reflected a strategic shift to differentiate the two‑door variants from the more practical saloon and estate models. Built on the same L7 platform as the F30 3 Series, the F32 offered a lower, wider stance and sharper handling. Under the bonnet, buyers could choose from a comprehensive range of petrol and diesel engines -four‑cylinder and six‑cylinder, from the entry‑level 418i to the fire‑breathing M4 Competition. A May 2016 facelift brought updated engines, with the N20 and N55 replaced by the more reliable B48 and B58. Production ran until September 2020, when the G22 second generation replaced it.

Key Facts

Platform

BMW L7 (shared with F30 3 Series)

Predecessor

BMW E92/E93 3 Series Coupé/Convertible

Successor

BMW G22 4 Series

Sibling body styles in this generation

F33 (convertible), F36 (Gran Coupé)

Market Intelligence

The F32 generates consistent UK enquiries [PATTERN DATA], concentrated on 420d and 430i/440i petrol variants as these executive coupés enter affordable‑maintenance territory.

Best & Worst Engines

Thin-Data Summary

“Most dependable: The B58 3.0‑litre straight‑six (440i) -widely regarded as one of BMW's most reliable modern engines and used by Toyota in the Supra -delivers 326 hp, effortless torque, and proven durability. The B48 2.0‑litre four‑cylinder (430i) is the pick of the four‑cylinder range, having solved the N20's timing chain issues. The N55 (435i) is a strong, reliable six‑cylinder option if well maintained. The early N20 (420i/428i) carries the highest risk -timing chain stretch and guide failure are well‑documented. The S55 (M4) is a proven high‑performance engine. Buyers should prioritise LCI models (2016 onwards) with B48 or B58 engines.”

Who it's for:

Thin-Data Summary

“Most dependable: The B58 3.0‑litre straight‑six (440i) -widely regarded as one of BMW's most reliable modern engines and used by Toyota in the Supra -delivers 326 hp, effortless torque, and proven durability. The B48 2.0‑litre four‑cylinder (430i) is the pick of the four‑cylinder range, having solved the N20's timing chain issues. The N55 (435i) is a strong, reliable six‑cylinder option if well maintained. The early N20 (420i/428i) carries the highest risk -timing chain stretch and guide failure are well‑documented. The S55 (M4) is a proven high‑performance engine. Buyers should prioritise LCI models (2016 onwards) with B48 or B58 engines.”

Who it's for:

BMW 4 Series F32 -Ownership Economics

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

B38 418i60k–120kWater pump, coil packs£200–£500£1,800–£3,200

Efficient Entry -three‑cylinder economy

N20 420i/428i50k–100kTiming chain stretch£650–£1,800£2,000–£4,000

Risky Four -avoid without chain history

B48 420i/430i80k–150kWater pump, PCV valve£300–£700£2,200–£4,200

Solid Four -the N20's reliable successor

N55 435i80k–150kCarbon build‑up, oil leaks£300–£800£2,800–£5,000

Strong Six -proven and characterful

B58 440i100k–180kWater pump, coolant leaks£300–£700£3,200–£5,800

Best Petrol -BMW's most reliable modern six

S55 M460k–120kCrank hub, oil leaks£500–£1,500£5,000–£9,000

Performance Icon -power comes at a cost

N47 420d60k–120kTiming chain stretch£650–£1,800£2,500–£4,500

Diesel Four -rear‑chain risk

B47 420d80k–160kDPF, EGR, injector wear£300–£800£2,500–£4,800

Solid Diesel -N47's reliable successor

N57 425d/430d/435d80k–160kDPF, EGR, turbo wear£400–£1,000£3,000–£5,500

Six‑Cylinder Diesel -torque‑rich and refined

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

B38 418i60k–120kWater pump, coil packs£200–£500£1,800–£3,200

Efficient Entry -three‑cylinder economy

N20 420i/428i50k–100kTiming chain stretch£650–£1,800£2,000–£4,000

Risky Four -avoid without chain history

B48 420i/430i80k–150kWater pump, PCV valve£300–£700£2,200–£4,200

Solid Four -the N20's reliable successor

N55 435i80k–150kCarbon build‑up, oil leaks£300–£800£2,800–£5,000

Strong Six -proven and characterful

B58 440i100k–180kWater pump, coolant leaks£300–£700£3,200–£5,800

Best Petrol -BMW's most reliable modern six

S55 M460k–120kCrank hub, oil leaks£500–£1,500£5,000–£9,000

Performance Icon -power comes at a cost

N47 420d60k–120kTiming chain stretch£650–£1,800£2,500–£4,500

Diesel Four -rear‑chain risk

B47 420d80k–160kDPF, EGR, injector wear£300–£800£2,500–£4,800

Solid Diesel -N47's reliable successor

N57 425d/430d/435d80k–160kDPF, EGR, turbo wear£400–£1,000£3,000–£5,500

Six‑Cylinder Diesel -torque‑rich and refined

The F32 rule

A £3,200–£5,800 B58 recon against a £6,000–£20,000 F32 sits at 16–97% of the car's value. On a sub‑£8,000 F32, that brushes our 70% BMW threshold -we'll honestly tell you to walk away. Against a well‑kept £15,000+ example, the same recon drops to a routine 20–40% -a repair decision, not a financial one. Value the car first.

Common Problems

01

N20

Timing Chain Stretch & Guide Failure

Affected models:

F32 420i, 428i (2013–2016) with N20 engine.

N20 Timing Chain Stretch & Guide Failure

Typical failure mileage:

50,000–100,000 miles.

Root cause:

The N20's timing chain guides are made of plastic that degrades over time -leading to chain stretch, rattling on start‑up, and eventual catastrophic engine failure if the chain snaps.

Tiered Cost Table

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 £2,500–£4,500 replacement that follows if ignored.

Compare N20 engine prices for your F32

02

B58

Water Pump & Coolant System

Affected models:

F32 440i (2016–2020) with B58 engine.

Typical failure mileage:

60,000–120,000 miles.

Root cause:

The B58's water pump and cooling system components can fail, leading to coolant loss, overheating, and potential engine damage if not addressed promptly.

Tiered Cost Table

Our Recommendation

On any 440i, budget for water pump inspection at 60k miles -a £200–£500 preventative replacement is cheap insurance against the £3,200–£5,800 replacement that follows a catastrophic overheat.

Compare B58 engine prices for your F32

03

N47

Timing Chain Stretch (Pre‑LCI Diesel)

Affected models:

F32 420d (2013–2015) with N47 engine.

N47 Timing Chain Stretch (Pre‑LCI Diesel)

Typical failure mileage:

60,000–120,000 miles.

Root cause:

The N47's 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

Our Recommendation

At the first sign of cold‑start rattle on a pre‑LCI 420d, get the chain inspected immediately -a £650–£1,800 preventative repair is dramatically cheaper than the £2,500–£4,500 replacement that follows if ignored.

Compare N47 engine prices for your F32

04

S55

Crank Hub Spinning

Affected models:

F82 M4 (2014–2020) with S55 engine.

Typical failure mileage:

30,000–80,000 miles (more common on tuned cars).

Root cause:

The S55's crank hub can spin on the crankshaft -a well‑documented issue on high‑power S55 engines, particularly on tuned examples. This causes timing to slip, leading to catastrophic engine damage.

Tiered Cost Table

Our Recommendation

If you're buying a tuned M4 or planning to tune one, budget for a crank hub capture or pinned crank hub as preventative maintenance -£800–£1,800 now is far cheaper than the £5,000–£9,000 replacement that follows a spun hub.

Compare S55 engine prices for your M4

05

F32

Tailgate Wiring Loom Fracture (Non‑Engine)

Affected models:

All F32 variants, particularly early 2013–2016 models.

F32 Tailgate Wiring Loom Fracture (Non‑Engine)

Typical failure mileage:

N/A -age‑related.

Root cause:

Not an engine failure, but a common non‑engine issue on BMW coupés -the wiring loom in the boot hinge area can fracture, causing rear light failure and boot release problems.

Tiered Cost Table

Our Recommendation

Have the boot wiring inspected on any F32 -it's a common age‑related failure that can cause MOT issues if left unaddressed.

Compare F32 wiring repair quotes

F32 Engine Replacement Costs -By Engine and Condition

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

418iB38B15£1,000–£2,000£1,800–£3,200£3,000–£4,5008–12 hrs

420i (pre‑LCI)N20B20U0£1,200–£2,200£2,000–£3,500£3,500–£5,00010–14 hrs

428iN20B20O0£1,200–£2,500£2,200–£4,000£3,800–£5,50010–14 hrs

420i/430i (LCI)B48B20£1,300–£2,500£2,200–£4,200£3,800–£5,80010–14 hrs

435iN55B30£1,800–£3,200£2,800–£5,000£4,500–£7,00012–16 hrs

440iB58B30£2,000–£3,800£3,200–£5,800£5,000–£8,00012–16 hrs

M4S55B30T0£3,000–£5,500£5,000–£9,000£8,000–£13,00016–20 hrs

420d (pre‑LCI)N47D20£1,500–£3,000£2,500–£4,500£4,000–£6,00010–14 hrs

420d (LCI)B47D20£1,500–£3,000£2,500–£4,800£4,000–£6,50010–14 hrs

425d/430d/435dN57D30£2,000–£3,500£3,000–£5,500£4,500–£7,50012–16 hrs

No Generation variance from the Model Page's baseline figures -F32 shares similar engine‑bay access with its F33 and F36 siblings, so costs are inherited directly per the Authority Model, with no divergence note required. All costs are [BMW-QUOTE] from Table A -Engine Replacement Economics.

Core Variants

Diesel & Petrol Lineup

Diesel Variants

420d425d430d435d418d

Petrol Variants

418i420i428i430i435i440iM4

Scope note: All variants listed are BMW 4 Series F32 (first‑generation coupé) only -2‑door coupé body style. F33 (convertible) and F36 (Gran Coupé) are covered on their own Generation Pages.

Diesel & Petrol Lineup

Diesel Variants

420d425d430d435d418d

Petrol Variants

418i420i428i430i435i440iM4

Scope note: All variants listed are BMW 4 Series F32 (first‑generation coupé) only -2‑door coupé body style. F33 (convertible) and F36 (Gran Coupé) are covered on their own Generation Pages.

Market Intelligence

Most Requested E90 Engines (2025)

Most Requested E90 Variants

Average E90 Replacement Cost

Most Common E90 Failures

FAQ

BMW 3 Series E90 rear three-quarter view

Why UK BMW 4 Series F32 Owners Trust BMWEngines.uk

Trusted F32 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real F32 owners, as part of the Engine Finders network.
Compare F32 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit.
UK Engine Replacement Services for BMW 4 Series F32
covering every variant from 418i to M4 and 420d to 435d, with supply-only or full supply & fit available nationwide.

Find the best BMW 4 Series F32 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 4 Series F32 Engine Prices on EnginesMarket

Why UK BMW 4 Series F32 Owners Trust BMWEngines.uk

Trusted F32 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real F32 owners, as part of the Engine Finders network.
Compare F32 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit.
UK Engine Replacement Services for BMW 4 Series F32
covering every variant from 418i to M4 and 420d to 435d, with supply-only or full supply & fit available nationwide.

Find the best BMW 4 Series F32 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 4 Series F32 Engine Prices on EnginesMarket

BMW 4 Series F32 Engines -The Complete UK Guide

BMW 4 Series F32 Engine Codes -The Complete Database

BMW 4 Series F32 -Overview

BMW 4 Series F32 -Overview

Best &amp; Worst Engines

BMW 4 Series F32 -Ownership Economics

Common Problems

F32 Engine Replacement Costs -By Engine and Condition

Diesel &amp; Petrol Lineup

Diesel &amp; Petrol Lineup

Market Intelligence

FAQ

Why UK BMW 4 Series F32 Owners Trust BMWEngines.uk

Why UK BMW 4 Series F32 Owners Trust BMWEngines.uk

Best & Worst Engines

Diesel & Petrol Lineup

Diesel & Petrol Lineup