How much does a BMW 1 Series 118i engine replacement cost in the UK?

A reconditioned B38 three‑cylinder typically costs £3,000–£5,000 supply only, with older N46/N43/N13 units slightly lower. Fitting adds £800–£1,300. Use our calculator for a figure specific to your 118i.

What are the common problems with the BMW 118i engine?

Timing chain stretch (N43/N13), HPFP failure (N43/N13), carbon buildup (N13), and water pump failure (B38). Each generation has its own character and watchpoints.

Is it worth replacing a 118i engine, or should I scrap the car?

Depends on vehicle value. An E87 118i is a £1,000–£4,000 vehicle - replacement may exceed our 70% BMW scrap threshold on lower-value examples. An F40 118i is a £10,000–£20,000 vehicle - a £3,500–£4,500 recon is 18–45% of the car's value, making replacement viable. Evaluate carefully based on your car's generation and condition.

How do I find my BMW 118i engine code?

Listed on the VIN plate and vehicle documentation. The 118i covers N46 (2004–2007), N43 (2007–2011), N13 (2011–2019), and B38 (2019+). Tell us your registration date and we'll confirm which one you have for free.

Can I prevent the timing chain issues on a 118i?

Yes - regular oil changes with BMW Longlife‑04 spec oil and shortened intervals (5,000–7,500 miles) are the most effective prevention for N43/N13 engines. At the first sign of cold‑start rattle, book an inspection immediately.

BMW 1 Series 118i2004–presentN46/N43 / N13 / B38

BMW 1 Series 118i Engine Replacement — Compare Prices & Get Quotes

The 118i badge spans four engine generations - naturally aspirated N46/N43, turbocharged N13, and the modern B38 three-cylinder. Get quotes from trusted UK specialists today.

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1 Series 118i Engines - from £900 to £5,500

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The 118i THROUGH TIME - Era Map

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

GenerationYearsEngine CodeReliabilityRecon CostEra Note

Why use this era map?

This table is the single source every other section on this page matches - Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 1 Series 118i Engine Replacement Costs

Supply Only£2,500–£4,500

Fitted (Indie)£3,500–£5,800

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£900–£2,500£1,700–£3,6001–6 monthsBudget priority; vehicle under £3,000

Reconditioned Engine£2,500–£4,500£3,500–£5,80012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£3,500–£5,500£4,600–£6,90012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£5,000–£8,000£6,200–£9,50024–36 monthsInsurance jobs, warranty claims

Figures above reflect the current B38 generation; older eras run lower - see the Era Map above.

Labour estimate: Fitting a 1 Series 118i engine typically takes 8–12 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).

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Common Problems With BMW 320d Engines

1. Timing Chain Stretch (N43/N13, E81/E87 2007–2011 & F20/F21 2011–2019)

Symptoms: Rattling noise on cold start, metallic ticking, engine warning light, loss of power.

Typical mileage: 60,000–100,000 miles

Repair cost: £800–£1,800 (chain and tensioner replacement) [PLACEHOLDER - confirm vs cost sheet]

Replacement cost: N/A - repair only (if caught before catastrophic failure)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

This is the defining issue for N43 and N13 118is. The timing chain tensioner can fail, allowing the chain to stretch or skip. Regular oil changes with BMW Longlife‑04 spec oil are essential. At the first sign of cold‑start rattle, have the chain inspected immediately - catching it early saves you from a £1,800+ repair bill.

1. Timing Chain Stretch (N43/N13, E81/E87 2007–2011 & F20/F21 2011–2019)

Symptoms: Rattling noise on cold start, metallic ticking, engine warning light, loss of power.

Typical mileage: 60,000–100,000 miles

Repair cost: £800–£1,800 (chain and tensioner replacement) [PLACEHOLDER - confirm vs cost sheet]

Replacement cost: N/A - repair only (if caught before catastrophic failure)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

2. High‑Pressure Fuel Pump Failure (N43/N13, E81/E87 2007–2011 & F20/F21 2011–2019)

Symptoms: Long crank on start, rough idle, loss of power, engine stalling, engine warning light.

Typical mileage: 60,000–120,000 miles

Repair cost: £600–£1,200 (HPFP replacement) [PLACEHOLDER - confirm vs cost sheet]

Replacement cost: N/A - repair only (unless injectors also damaged)

🟠 Check - book inspection urgently if symptoms appear

Our recommendation:

The HPFP is a known weak point on both N43 and N13 engines. If you experience long cranking times or rough running, have the fuel pressure tested. Replacing the HPFP is far cheaper than the collateral damage that can occur from injector failure if fuel pressure drops.

3. Cooling System Issues (B38, F40/F70 2019+)

Symptoms: Coolant loss, temperature fluctuations, engine warning light, heater not working properly.

Typical mileage: 40,000–80,000 miles

Repair cost: £400–£800 (water pump or thermostat replacement) [PLACEHOLDER - confirm vs cost sheet]

Replacement cost: N/A - repair only

🟡 Monitor - book inspection soon

Our recommendation:

The B38's cooling system, like other modern BMW engines, can suffer from water pump and thermostat failures. The electric water pump is a common failure point. If you notice temperature fluctuations or coolant loss, have the system inspected. Replacing a failing water pump preventatively is cheaper than the overheating damage it can cause.

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118i - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

118i - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseTiming chain stretch (N43/N13)✅ Yes£800–£1,800Catch it early - before chain snapsHPFP failure (N43/N13)✅ Yes£600–£1,200Straightforward - replace pump and clean injectorsWater pump failure (B38)✅ Yes£400–£800Routine maintenance - do preventativelyCarbon buildup (N13)✅ Yes£300–£600Periodic maintenance - walnut blastingSevere engine damage (chain snap / overheating)❌ Usually NoEngine replacementLittle left to salvage - replacement is the only option

Buying This 118i? Check These First

Buy If

N43/N13 (2007–2019): documented timing chain history (replaced or inspected)
N13 (2011–2019): carbon cleaning performed - or budget for it
B38 (2019+): cooling system maintained with recent water pump work
Full service history with BMW-spec oil (Longlife‑04 or LL‑12 FE)

Avoid If

Cold‑start rattle with no timing chain history on N43/N13 - walk away
Long cranking on N43/N13 - HPFP may be failing
Coolant loss with no diagnosis on B38 - water pump may be failing
Engine warning light with no diagnosis - potentially expensive injection issues

Closing Verdict

The 118i badge is a fascinating journey through BMW petrol engine development - from naturally aspirated N46/N43 to the turbocharged N13 and the modern B38 three-cylinder. The N46 is the most reliable of the early units; the N43 and N13 are more powerful but have timing chain and HPFP watchpoints; the B38 is the most reliable overall with only cooling system concerns. Buy on generation-specific history - and never ignore a cold‑start rattle.

Don't guess.Get the right engine at the right price.

→ Compare 118i engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

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Buying Checklist

Before you buy a used BMW 1 Series 118i (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattling or ticking; timing chain issue indicator (N43/N13)

Cranking Time

Check for long cranking; HPFP failure indicator (N43/N13)

Service History

including which engine era (N46/N43/N13/B38) and confirmed oil‑change intervals

Coolant Level (B38)

Check for unexplained loss; water pump may be failing

Carbon Build-up (N13)

Check for rough idle or hesitation; may need walnut blasting

Oil Consumption

Does it use more than 1L per 1,000 miles?

Engine Warning Light

Have codes been read? Any unresolved issues?

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 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

BMW 320d Engine Codes

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

N46 (2.0 4-cyl, port injection)

Years2004–2007

Power129 PS (122 bhp) @ 6,000 rpm

2025 Enquiries- (pattern data)

Avg. Recon Cost£1,500–£2,800 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N46 (2.0 4-cyl, port injection)2004–2007129 PS (122 bhp) @ 6,000 rpm- (pattern data)£1,500–£2,800 [PLACEHOLDER]

N43 (2.0 4-cyl, direct injection)2007–2011143 PS (143 bhp) @ 6,000 rpm- (pattern data)£1,500–£2,800 [PLACEHOLDER]

N13 (1.6 4-cyl turbo)2011–2019170 PS (168 bhp) @ 4,800 rpm; 250 Nm @ 1,500–4,500 rpm- (pattern data)£1,800–£3,200 [PLACEHOLDER]

B38 (1.5 3-cyl turbo)2019–2024136–140 PS @ 4,400 rpm; 220 Nm @ 1,480–4,200 rpm- (pattern data)£3,000–£5,000 [PLACEHOLDER]

B38 (1.5 3-cyl turbo, revised, MHEV)2024–present140 PS @ 4,400 rpm; 220 Nm @ 1,480–4,200 rpm- (pattern data)£3,200–£5,500 [PLACEHOLDER]

Technical Specs

B38 1.5 three-cylinder

Displacement1,499 cc

Cylinders3-cylinder inline

Compression Ratio11.0:1

Fuel SystemDirect injection

TurbochargerSingle-turbo (twin-scroll)

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Market Intelligence

Most Common Failure

N43/N13: timing chain stretch / HPFP; B38: water pump

[PATTERN DATA]

Average Enquiry Mileage

75,000

miles

[PATTERN DATA]

Average Replacement Cost

£3,500

reconditioned, supply only

[PLACEHOLDER - confirm vs cost sheet]

Most Requested Engine Code

N13 (F20/F21)

40%

of 118i enquiries

[PATTERN DATA]

Peak Enquiry Season

Winter

cold starts expose chain and HPFP issues

[PATTERN DATA]

Regional Demand

London20%

South East18%

North West14%

PATTERN DATA

Regional Demand Breakdown

20%London

18%South East

14%North West

BMW 320d - Frequently Asked Questions

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.

Find the best BMW 1 Series 118i engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence - from £900 for a used unit to £5,500 for a fully rebuilt modern petrol engine.

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12-Month Warranty

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100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available