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

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Name: BMW 1 Series 118i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

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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NationwideDelivery
20+Specialists

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

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Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

Instant Quotes
No Obligation
100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
UK-Wide Network

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 Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£900 – £2,500	£1,700 – £3,600	1–6 months	Budget priority; vehicle under £3,000
Reconditioned Engine	£2,500 – £4,500	£3,500 – £5,800	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£3,500 – £5,500	£4,600 – £6,900	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£5,000 – £8,000	£6,200 – £9,500	24–36 months	Insurance 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 1 Series 118i 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)
Urgency: 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)
Urgency: 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)
Urgency: 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
Urgency: 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?

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
Timing chain stretch (N43/N13)	Yes	£800 – £1,800	Catch it early — before chain snaps
HPFP failure (N43/N13)	Yes	£600 – £1,200	Straightforward — replace pump and clean injectors
Water pump failure (B38)	Yes	£400 – £800	Routine maintenance — do preventatively
Carbon buildup (N13)	Yes	£300 – £600	Periodic maintenance — walnut blasting
Severe engine damage (chain snap / overheating)	Usually No	Engine replacement	Little left to salvage — replacement is the only option

ProblemRepairable? · Typical Cost

Timing chain stretch (N43/N13)

Yes£800 – £1,800

Catch it early — before chain snaps

HPFP failure (N43/N13)

Yes£600 – £1,200

Straightforward — replace pump and clean injectors

Water pump failure (B38)

Yes£400 – £800

Routine maintenance — do preventatively

Carbon buildup (N13)

Yes£300 – £600

Periodic maintenance — walnut blasting

Severe engine damage (chain snap / overheating)

Usually NoEngine replacement

Little 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.

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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:

1. Cold Start
Listen for rattling or ticking; timing chain issue indicator (N43/N13)
2. Cranking Time
Check for long cranking; HPFP failure indicator (N43/N13)
3. Service History
Including which engine era (N46/N43/N13/B38) and confirmed oil‑change intervals
4. Coolant Level (B38)
Check for unexplained loss; water pump may be failing
5. Carbon Build-up (N13)
Check for rough idle or hesitation; may need walnut blasting
6. Oil Consumption
Does it use more than 1L per 1,000 miles?
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 1 Series 118i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

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

1
Cold Start
Listen for rattling or ticking; timing chain issue indicator (N43/N13)
2
Cranking Time
Check for long cranking; HPFP failure indicator (N43/N13)
3
Service History
Including which engine era (N46/N43/N13/B38) and confirmed oil‑change intervals
4
Coolant Level (B38)
Check for unexplained loss; water pump may be failing
5
Carbon Build-up (N13)
Check for rough idle or hesitation; may need walnut blasting
6
Oil Consumption
Does it use more than 1L per 1,000 miles?
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 1 Series 118i pitfalls.

Engine Codes

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

N46 (2.0 4-cyl, port injection)

Years: 2004–2007
Power: 129 PS (122 bhp) @ 6,000 rpm
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £1,500–£2,800[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
N46 (2.0 4-cyl, port injection)	2004–2007	129 PS (122 bhp) @ 6,000 rpm	—(pattern data)	£1,500–£2,800[PLACEHOLDER]
N43 (2.0 4-cyl, direct injection)	2007–2011	143 PS (143 bhp) @ 6,000 rpm	—(pattern data)	£1,500–£2,800[PLACEHOLDER]
N13 (1.6 4-cyl turbo)	2011–2019	170 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)	2019–2024	136–140 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–present	140 PS @ 4,400 rpm; 220 Nm @ 1,480–4,200 rpm	—(pattern data)	£3,200–£5,500[PLACEHOLDER]

Technical SpecsB38 1.5 three-cylinder

Displacement: 1,499 cc
Cylinders: 3-cylinder inline
Compression Ratio: 11.0:1
Fuel System: Direct injection
Turbocharger: Single-turbo (twin-scroll)

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Market Intelligence

Real data from thousands of 1 Series 118i enquiries in 2025.

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]

Most Requested Engine CodeN13 (F20/F21)

40%

of 118i enquiries

[PATTERN DATA]

Peak Enquiry Season

Winter

Cold starts expose chain and HPFP 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 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.

It depends which engine your 118i has. The N46 is the most reliable of the early units. The N43 and N13 are powerful but have timing chain and HPFP watchpoints. The B38 is the most reliable overall with only cooling system concerns. Check the Era Map above for your specific car.

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.

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.

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.

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.

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

BMW 1 Series 118i Engine Replacement Costs

Common Problems With BMW 1 Series 118i Engines

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

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

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

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

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

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

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118i — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 118i? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 1 Series 118i Owners Trust BMWEngines.uk

BMW 1 Series 118i Engine Replacement —Compare Prices &
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