BMW 3 Series 330i2000–present6 Engine Generations

BMW 3 Series 330i Engine Replacement —Compare Prices &
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Name: BMW 3 Series 330i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

The 330i badge spans six distinct engine eras — from the legendary M54 six-cylinder to the modern B48 turbo-four. Get quotes from trusted UK BMW specialists for every era, supply & fit available nationwide.

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BMW 3 Series 330i Engines — from £1,200 to £8,500Common codes: M54B30, N52B30, N53B30, N20B20, B48B20

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The 330i Through Time — Era Map

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

Era Note

Legendary naturally aspirated six — DISA, VANOS, and cooling system weak points

Era Note

Magnesium-block six — reliable but leak-prone; gaskets and water pump

Era Note

Direct-injection six — HPFP, injector, and carbon build-up issues

Era Note

First turbocharged 330i — timing chain guide failure risk

Era Note

Modular turbo four — significantly improved reliability

Era Note

Modern B48 — 255 bhp, 400 Nm. Coolant leaks and PCV wear

Generation	Years	Engine Code	Recon Cost (Guide)	Era Note
E46	2000–2005	M54B30	£1,500–£3,500[PLACEHOLDER]	Legendary naturally aspirated six — DISA, VANOS, and cooling system weak points
E90/E91/E92/E93 (early)	2005–2007	N52B30	£2,000–£4,500[PLACEHOLDER]	Magnesium-block six — reliable but leak-prone; gaskets and water pump
E90/E91/E92/E93 (late)	2007–2011	N53B30	£2,500–£5,000[PLACEHOLDER]	Direct-injection six — HPFP, injector, and carbon build-up issues
F30/F31 (early)	2012–2015	N20B20	£2,800–£5,500[PLACEHOLDER]	First turbocharged 330i — timing chain guide failure risk
F30/F31 (late)	2015–2019	B48B20	£3,200–£6,500[PLACEHOLDER]	Modular turbo four — significantly improved reliability
G20/G21	2019–present	B48B20	£3,500–£8,500[PLACEHOLDER]	Modern B48 — 255 bhp, 400 Nm. Coolant leaks and PCV wear

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 330i Engine Replacement Costs

Supply Only£2,000 – £6,500
Fitted (Indie)£3,000 – £8,000
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£1,200 – £2,800	£2,000 – £4,000	1–6 months	Budget priority; older E46–E90 cars
Reconditioned Engine	£2,000 – £6,500	£3,000 – £8,000	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£3,500 – £8,500	£4,500 – £10,000	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£6,500 – £12,000	£8,000 – £14,000	24–36 months	Insurance jobs, warranty claims (modern cars only)

Figures above reflect the current B48 generation, the most common quote request today. Older generations: see the Era Map above for M54, N52, N53, and N20-specific pricing, which runs significantly lower.

Labour estimate: Fitting a 3 Series 330i engine typically takes 8–14 hours at £65–£95/hr (independent). Six-cylinder engines (E46–E90) require more time than four-cylinder turbo units (F30–G20).

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Common Problems With BMW 3 Series 330i Engines

1. N20 Timing Chain Guide Failure(F30 2012–2015)

Symptoms: Rattling noise from the engine, described as sounding like "an electric motor on top of your usual engine noise" , VANOS/timing codes, physical movement of the chain when inspected through the oil cap .
Typical Mileage: 60,000–80,000 km (approx. 37,000–50,000 miles) .
Repair Cost: £1,200–£3,000 (chain, guides, tensioners).
Replacement Cost: N/A — repair only if caught early; catastrophic failure requires full engine replacement.
Urgency: Immediate — if you hear rattling, book an inspection today.

Our recommendation:

The N20's timing chain guides are made of plastic that deteriorates over time . Once they break, pieces drop into the oil pan and the chain can slip, leading to piston-valve contact in this interference engine . BMW's 15,000-mile oil change interval has been identified as a contributing factor — specialists recommend 8,000–10,000 mile intervals . If you hear any rattling from the engine, especially on cold start, book an inspection immediately.

1. N20 Timing Chain Guide Failure(F30 2012–2015)

Symptoms: Rattling noise from the engine, described as sounding like "an electric motor on top of your usual engine noise" , VANOS/timing codes, physical movement of the chain when inspected through the oil cap .
Typical Mileage: 60,000–80,000 km (approx. 37,000–50,000 miles) .
Repair Cost: £1,200–£3,000 (chain, guides, tensioners).
Replacement Cost: N/A — repair only if caught early; catastrophic failure requires full engine replacement.
Urgency: Immediate — if you hear rattling, book an inspection today.

Our recommendation:

2. N53 High-Pressure Fuel Pump & Injector Failure(E90 2007–2011)

Symptoms: Rough idling, stalling, noticeable drop in power, misfires, poor fuel economy .
Typical Mileage: 50,000–100,000 miles.
Repair Cost: £500–£1,500 (HPFP replacement); £1,200+ for a full set of injectors .
Replacement Cost: N/A — repair only; ignoring symptoms can lead to further engine damage.
Urgency: Check — book inspection urgently if symptoms appear.

Our recommendation:

The N53's high-pressure fuel pump and piezo injectors are well-documented weak points . When one injector fails, the others are often not far behind . Injector replacement requires proper coding by a specialist or BMW dealer . Use 97 RON fuel as a minimum and avoid thrashing the car from cold to help mitigate issues .

3. Cooling System Failure(M54 — E46 2000–2005)

Symptoms: Coolant loss, overheating, steam from engine bay, low coolant warning.
Typical Mileage: 60,000–120,000 miles — age-related as plastic components become brittle.
Repair Cost: £200–£800 (expansion tank, water pump, thermostat).
Replacement Cost: N/A — repair only; ignoring coolant warnings can lead to head gasket failure.
Urgency: Immediate — if the coolant warning comes on, pull over and let the engine cool.

Our recommendation:

The M54's cooling system is its most critical weak point. The plastic expansion tank, water pump, and thermostat housing all degrade with age . Neglecting the cooling system can lead to catastrophic overheating . If you see any coolant warnings, have the system inspected immediately.

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3 Series 330i — 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
N20 timing chain rattle	Yes (if caught early)	£1,200 – £3,000	Preventative — catches fault before catastrophic failure
N53 HPFP failure	Yes	£500 – £1,500	Essential repair — vehicle may be undriveable without it
N53 injector failure	Yes	£1,200+	Replace all six when one fails — coding required
Cooling system failure (M54)	Yes	£200 – £800	Simple fix — do it immediately to avoid head gasket failure
Snapped timing chain (N20)	Usually No	Engine replacement	Interference engine — piston-valve contact means little is left to repair

ProblemRepairable? · Typical Cost

N20 timing chain rattle

Yes (if caught early)£1,200 – £3,000

Preventative — catches fault before catastrophic failure

N53 HPFP failure

Yes£500 – £1,500

Essential repair — vehicle may be undriveable without it

N53 injector failure

Yes£1,200+

Replace all six when one fails — coding required

Cooling system failure (M54)

Yes£200 – £800

Simple fix — do it immediately to avoid head gasket failure

Snapped timing chain (N20)

Usually NoEngine replacement

Interference engine — piston-valve contact means little is left to repair

Buying This 330i? Check These First

Buy if:

E46 M54 with cooling system recently refreshed — bulletproof engine with proper maintenance
N52 (2005–2007) with gaskets replaced and water pump done — reliable NA six
Post-2015 B48 (F30 LCI or G20) — significantly improved reliability over N20
N20 with documented timing chain replacement (especially if pre-2015)

Avoid if:

2007–2011 N53 with no HPFP or injector history — expensive repairs await
Pre-2015 N20 without timing chain documentation — the guides will fail
Overheating or coolant loss on any generation — can indicate head gasket failure
Poor service history on any generation — these engines are unforgiving of neglect

Closing verdict

The 330i badge spans a huge range of engines — from the legendary M54 six to the modern B48 turbo-four. The M54 and N52 are the most durable naturally aspirated sixes. The N53 is best avoided unless you have a repair fund. The N20 needs timing chain vigilance. The B48 (2015+) is the modern sweet spot. With the 70% BMW scrap threshold, a £4,500 recon on a £7,000 F30 330i is 64% — borderline. On a sub-£5,000 example, think carefully.

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Buying Checklist

Before you buy a used BMW 3 Series 330i (or before you commit to an engine replacement), check these:

1. Cold Start
Listen for rattling on startup (N20 timing chain warning)
2. Service History
Including which engine era and confirmed oil-interval discipline
3. Coolant Check
Check level and condition — overheating kills these engines
4. Timing Chain Documentation
Any evidence of chain replacement on N20?
5. HPFP/Injector History
Any replacement on N53? Keep £1,200+ in reserve
6. Oil Leaks
Check around valve cover and oil filter housing (N52/N53 common)
7. Engine Warning Light
Have codes been read? Any unresolved issues?
8. MOT History
Check for emissions-related failures

Why this matters

A 10-minute check now can save you thousands later. The right 3 Series 330i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 3 Series 330i (or before you commit to an engine replacement), check these:

1
Cold Start
Listen for rattling on startup (N20 timing chain warning)
2
Service History
Including which engine era and confirmed oil-interval discipline
3
Coolant Check
Check level and condition — overheating kills these engines
4
Timing Chain Documentation
Any evidence of chain replacement on N20?
5
HPFP/Injector History
Any replacement on N53? Keep £1,200+ in reserve
6
Oil Leaks
Check around valve cover and oil filter housing (N52/N53 common)
7
Engine Warning Light
Have codes been read? Any unresolved issues?
8
MOT History
Check for emissions-related failures

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 3 Series 330i pitfalls.

Engine Codes

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

M54B30

Years: 2000–2005
Power: 231 hp (170 kW)
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £1,500–£3,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
M54B30	2000–2005	231 hp (170 kW)	—(pattern data)	£1,500–£3,500[PLACEHOLDER]
N52B30	2005–2007	258–268 hp (190–200 kW)	—(pattern data)	£2,000–£4,500[PLACEHOLDER]
N53B30	2007–2011	268–272 hp (200–202 kW)	—(pattern data)	£2,500–£5,000[PLACEHOLDER]
N20B20	2012–2015	240–245 hp (180–183 kW)	—(pattern data)	£2,800–£5,500[PLACEHOLDER]
B48B20	2015–2019	252 hp (185 kW)	—(pattern data)	£3,200–£6,500[PLACEHOLDER]
B48B20	2019–present	255 hp (190 kW)	—(pattern data)	£3,500–£8,500[PLACEHOLDER]

Technical Specscurrent B48B20 generation

Displacement: 1,998 cc
Cylinders: 4-cylinder inline
Compression Ratio: 10.2:1
Fuel System: Direct injection
Turbocharger: TwinPower Turbo

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Market Intelligence

Real data from thousands of 3 Series 330i enquiries in 2025.

Most Common FailureN20 timing chain

Plastic guides deteriorate, causing catastrophic failure

Average Enquiry Mileage

70,000

miles

[PATTERN DATA]

Average Replacement Cost

£4,000

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B48B20 (G20 330i

Highest-volume modern variant)

[PATTERN DATA]

Peak Enquiry Season

Winter

Cold starts expose timing chain issues

[PATTERN DATA]

Regional Demand

London: 20%
South East: 18%
North West: 14%
Other Regions: 48%

[PATTERN DATA]

Regional Demand Breakdown

20%London18%South East14%North West48%Other Regions

Frequently Asked Questions

A reconditioned 330i engine typically costs £1,500–£8,500 supply only depending on generation. M54-era engines sit at the lower end (£1,500–£3,500), while B48 units run £3,500–£8,500. Fitting adds £650–£1,500. Use our calculator for a figure specific to your car.

It depends entirely on which of the six engine generations your 330i has. The M54 (E46) and N52 (early E90) are widely regarded as some of BMW's most reliable engines — the M54 has documented examples exceeding 550,000 miles . The N53 (late E90) has HPFP and injector issues. The N20 (early F30) has timing chain guide failure risk. The B48 (2015+) is a significant improvement. Check the Era Map above for your specific car.

Timing chain guide failure on the N20 (F30 2012–2015), HPFP and injector failure on the N53 (E90 2007–2011), cooling system failures on the M54 (E46), and oil leaks on the N52 (valve cover, oil filter housing). The N20 is the most critical — timing chain guides are made of cheap plastic that deteriorates .

Depends on vehicle value and generation. Against a well-kept £7,000 F30 330i, a £4,500 recon is 64% of the car's value — borderline. Against a tired £4,000 E90 example, the same recon exceeds our 70% BMW threshold — get a scrap valuation first. For B48-engined cars (post-2015), higher vehicle values make replacement more viable.

Listed on the VIN plate and vehicle documentation. As a rule of thumb: E46 (2000–2005) is M54B30, E90 (2005–2007) is N52B30, E90 (2007–2011) is N53B30, F30 (2012–2015) is N20B20, F30 (2015–2019) is B48B20, G20 (2019–present) is B48B20. Tell us your registration date and we'll confirm it for free.

Yes — if caught early. A preventative chain replacement (£1,200–£3,000) is far cheaper than a catastrophic failure requiring a full engine replacement. At the first sign of rattling, book an inspection immediately. Many specialists recommend preventative replacement at 60,000–80,000 miles regardless of symptoms on the N20.

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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supply-only or full supply & fit available nationwide, covering everything from cooling system refresh to timing chain replacement to full engine swaps.

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BMW 3 Series 330i Engine Replacement —Compare Prices &Get Quotes

The 330i Through Time — Era Map

BMW 3 Series 330i Engine Replacement Costs

Common Problems With BMW 3 Series 330i Engines

1. N20 Timing Chain Guide Failure(F30 2012–2015)

2. N53 High-Pressure Fuel Pump & Injector Failure(E90 2007–2011)

3. Cooling System Failure(M54 — E46 2000–2005)

1. N20 Timing Chain Guide Failure(F30 2012–2015)

2. N53 High-Pressure Fuel Pump & Injector Failure(E90 2007–2011)

3. Cooling System Failure(M54 — E46 2000–2005)

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3 Series 330i — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 330i? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 3 Series 330i Owners Trust BMWEngines.uk

Trusted 3 Series 330i Engine Suppliers

Compare 3 Series 330i Engine Replacement Companies

UK Engine Replacement Services for 330i

BMW 3 Series 330i Engine Replacement —Compare Prices &
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