How much does a BMW 3 Series 316i engine replacement cost in the UK?

A reconditioned 316i engine typically costs £800–£3,800 supply only depending on which generation you have (M40/M43 engines are cheaper; N13/B38 engines are more expensive). Fitting adds £800–£1,400. Use our calculator for a figure specific to your vehicle.

What are the common problems with the BMW 3 Series 316i?

The most serious issue is timing chain tensioner wear on N42/N46 and N13 engines – the plastic guides can fail, causing chain stretch and potential catastrophic engine damage. Other common problems include VANOS/VALVETRONIC system issues, oil leaks (valve cover, oil filter housing), and HPFP failure on N43/N13 engines.

Is it worth replacing a 316i engine, or should I scrap the car?

Depends on vehicle value and condition. Against a tidy £3,000–£10,000 316i, a £1,400–£3,800 recon is 15–40% of the car's value – often worth it. If the timing chain has snapped and caused valve damage, a full engine replacement may be necessary. Get a full diagnostic assessment before committing.

How do I find my 3 Series's engine code?

The 316i badge covers nine different engine variants across six generations. Check the engine code stamp on the engine block and your V5C. As a rule of thumb: E30/E36 (1987–1998) = M40/M43; E46 (1998–2005) = M43/N42/N46; E90 (2005–2011) = N45/N43; F30 (2012–2016) = N13; G20 (2019–present) = B38.

Can I repair a 316i engine issue, or does it need replacement?

Most issues – timing chain tensioner wear (if caught early), VANOS/VALVETRONIC issues, oil leaks, HPFP failure – are repairable. However, if the timing chain has snapped, the engine is an interference design – pistons will strike valves. In this case, a full engine replacement is usually more cost‑effective than a rebuild.

BMW 3 Series 316i1987–present6 Engine Generations

BMW 3 Series 316i Engine Replacement — Compare Prices & Get Quotes

Name: BMW 3 Series 316i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW specialists. Compare reconditioned, rebuilt and used M40, M43, N42, N45, N43 and N13 engines for the 3 Series 316i - the efficient, accessible entry point to the 3 Series range across six generations. Supply & fit available nationwide.

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BMW 3 Series 316i Engines - from £800 to £3,800Common codes: M40B16, M43B19, N42B18, N45B16, N43B16, N13B16A

BMW 3 Series 316i Engines - from £800 to £3,800· Common codes: M40B16, M43B19, N42B18, N45B16, N43B16, N13B16A

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BMW 3 Series 316i - Which Engine Does Your Car Actually Have?

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

Era Note

Simple SOHC 8V - robust but timing chain can be noisy

GenerationYearsEngine CodeReliabilityRecon CostEra Note

E30

1987–1991M40B16 (1.6L I4)★★★★☆ [NEWLY ASSIGNED - see Data Note]£800–£1,800 [PLACEHOLDER - confirm vs cost sheet]Simple SOHC 8V - robust but timing chain can be noisy

E36

1991–1994M40B16 (1.6L I4)★★★★☆ [NEWLY ASSIGNED - see Data Note]£800–£1,800 [PLACEHOLDER - confirm vs cost sheet]Same M40 as E30 - simple, durable, under‑stressed

E36

1994–1998M43B16 (1.6L I4)★★★★☆ [NEWLY ASSIGNED - see Data Note]£900–£1,900 [PLACEHOLDER - confirm vs cost sheet]SOHC 8V - improved over M40, timing chain tensioner wear possible

E36/E46

1998–2001M43B19 (1.9L I4)★★★★☆ [NEWLY ASSIGNED - see Data Note]£1,000–£2,200 [PLACEHOLDER - confirm vs cost sheet]1.9L version - 105 PS, 165 Nm, robust but ageing

E46

2001–2004N42B18 (1.8L I4)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£1,400–£2,800 [PLACEHOLDER - confirm vs cost sheet]VALVETRONIC, DOHC - timing chain and oil leaks are main weaknesses

E46

2003–2005N46B18 (1.8L I4)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£1,400–£2,800 [PLACEHOLDER - confirm vs cost sheet]Evolution of N42 - improved but retains similar issues

E90

2005–2007N45B16 (1.6L I4)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£1,600–£3,000 [PLACEHOLDER - confirm vs cost sheet]122 PS - DOHC, no VALVETRONIC, timing chain and injector issues

E90

2007–2011N43B16 (1.6L I4)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£1,600–£3,000 [PLACEHOLDER - confirm vs cost sheet]122 PS - direct injection, VALVETRONIC, HPFP and NOx sensor issues

F30

2012–2016N13B16A (1.6L I4 Turbo)★★★☆☆ [NEWLY ASSIGNED - see Data Note]£1,800–£3,500 [PLACEHOLDER - confirm vs cost sheet]136 PS - Prince engine, timing chain tensioner is the defining weakness

G20

2019–presentB38 (1.5L I3 Turbo)★★★★☆ [NEWLY ASSIGNED - see Data Note]£1,500–£3,800 [PLACEHOLDER - confirm vs cost sheet]Modern 3‑cylinder - refined, efficient, the most reliable of the 316i family

Why use this era map?

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

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 3 Series 316i Engine Replacement Costs

Supply Only£1,400–£2,800

Fitted (Indie)£2,200–£4,000

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£800–£1,800£1,400–£2,8001–6 monthsBudget priority; short‑term ownership

Reconditioned Engine£1,400–£2,800£2,200–£4,00012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£2,000–£3,800£3,000–£5,00012–24 monthsLong‑term ownership; maximum reliability

Main Dealer New£4,000–£6,000£5,500–£7,50024–36 monthsInsurance jobs; warranty claims; full provenance

Figures above reflect the 316i pricing across generations. The older M40/M43 engines are cheaper to replace (£800–£2,200); the newer N13 and B38 engines command a premium (£1,800–£3,800). Older generations: see the Era Map above for generation-specific pricing.

Labour estimate: Fitting a 316i engine typically takes 8–12 hours at £65–£95/hr (independent BMW specialist).

→ Compare 3 Series 316i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Timing Chain Tensioner Wear (N42/N46, N45/N43, N13)

Symptoms: Rattling noise on cold start, metallic whine from the engine, engine warning light, loss of power, potential catastrophic failure - especially prevalent on N42/N46 and N13 engines.

Typical mileage: 60,000–100,000 miles (N42/N46); 40,000–80,000 miles (N13).

Repair cost: £800–£2,000 [PLACEHOLDER] (timing chain tensioner and guide replacement).

Replacement cost: £1,600–£3,500 [PLACEHOLDER] (if chain snaps and damages the engine).

🔴 Immediate - if you hear a rattle or whine on cold start, book an inspection immediately.

Our recommendation:

The N42/N46 and N13 engines are particularly vulnerable to timing chain issues. The plastic timing chain guides can become brittle and fail, causing chain stretch or snap. On the N13 (F30), this is the defining weakness of the engine. On the N42/N46 (E46), the timing chain tensioner is a known weak point. A preventative chain and tensioner replacement at £800–£2,000 is far cheaper than a £1,600–£3,500 engine replacement. At the first sign of cold‑start rattle, have the timing system inspected immediately.

1. Timing Chain Tensioner Wear (N42/N46, N45/N43, N13)

Symptoms: Rattling noise on cold start, metallic whine from the engine, engine warning light, loss of power, potential catastrophic failure - especially prevalent on N42/N46 and N13 engines.

Typical mileage: 60,000–100,000 miles (N42/N46); 40,000–80,000 miles (N13).

Repair cost: £800–£2,000 [PLACEHOLDER] (timing chain tensioner and guide replacement).

Replacement cost: £1,600–£3,500 [PLACEHOLDER] (if chain snaps and damages the engine).

🔴 Immediate - if you hear a rattle or whine on cold start, book an inspection immediately.

Our recommendation:

2. VALVETRONIC / VANOS System Issues (N42/N46, N43)

Symptoms: Rough idle, loss of power, hesitation on acceleration, engine warning light, poor fuel economy.

Typical mileage: 40,000–80,000 miles.

Repair cost: £400–£1,200 [PLACEHOLDER] (VANOS solenoid or VALVETRONIC motor replacement).

Replacement cost: N/A - repair only (if caught early).

🟠 Check - book inspection urgently if engine warning light appears.

Our recommendation:

The N42/N46 and N43 engines feature BMW's VALVETRONIC variable valve lift and VANOS variable valve timing systems. These systems are sophisticated and effective but can develop issues. Solenoids can become clogged with oil sludge, and the VALVETRONIC motor can wear. Regular oil changes (using the correct BMW LL‑spec oil) are the best preventative measure. If the engine warning light appears with VANOS or VALVETRONIC codes, have the system diagnosed promptly.

3. Oil Leaks - Valve Cover & Oil Filter Housing (N42/N46, N45/N43)

Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning, visible oil leak from the top or front of the engine.

Typical mileage: 50,000–80,000 miles.

Repair cost: £300–£800 [PLACEHOLDER] (valve cover gasket or oil filter housing gasket replacement).

Replacement cost: N/A - repair only (if caught early; ignored oil loss can lead to engine damage).

🟠 Check - book inspection urgently if oil leak is detected.

Our recommendation:

The N42/N46 and N45/N43 engines are known for oil leaks from the valve cover gasket and oil filter housing gasket. If the oil filter housing gasket fails, oil can leak onto the serpentine belt, causing it to slip or break - which can then be ingested into the engine through the front crankshaft seal, causing catastrophic failure. If you notice oil spots under your 316i or a burning oil smell, investigate immediately. A £300–£800 gasket replacement is far cheaper than the consequences of a snapped belt.

4. High‑Pressure Fuel Pump (HPFP) Failure (N43, N13)

Symptoms: Long cranking on start (hot or cold), loss of power, engine stalling, engine warning light, reduced fuel economy.

Typical mileage: 40,000–80,000 miles.

Repair cost: £600–£1,200 [PLACEHOLDER] (HPFP replacement).

Replacement cost: N/A - repair only (if caught early).

🟠 Check - book inspection urgently if hard starting or power loss occurs.

Our recommendation:

The N43 (E90) and N13 (F30) use direct fuel injection with a high‑pressure fuel pump that can fail. Symptoms include long cranking times, particularly when hot, and loss of power. If the HPFP fails, the engine may run lean, causing misfires and potentially damaging the catalytic converter. Regular fuel filter changes and using high‑quality fuel can help prolong pump life, but HPFP replacement is a common maintenance item on these engines.

Weighing Your Options?

Compare Specialist Quotes When You're Ready

20+ vetted BMW specialists, covering every 316i engine generation from M40 to B38, with a 12‑month warranty as standard.

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BMW 3 Series 316i - 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.

BMW 3 Series 316i - 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 tensioner wear (N42/N46/N13)✅ Yes (if caught early)£800–£2,000 [PLACEHOLDER]Catch it early - cheaper than engine replacementTiming chain snapped❌ Usually No£1,600–£3,500+Full engine replacement - valve damage is almost certainVANOS / VALVETRONIC issues✅ Yes£400–£1,200 [PLACEHOLDER]Worth fixing - usually a solenoid or motor replacementOil leaks (valve cover / OFHG)✅ Yes£300–£800 [PLACEHOLDER]Essential maintenance - always worth doingHPFP failure (N43/N13)✅ Yes£600–£1,200 [PLACEHOLDER]Worth fixing on any 316i worth keepingMajor internal failure❌ Usually No£1,400–£3,500+Full engine replacement often more cost‑effective

Buying This BMW 3 Series 316i? Check These First

Buy If

Full BMW service history with documented oil changes (every 10,000–12,000 miles)
Timing chain inspected and any work documented (especially N42/N46/N13)
Evidence of premium fuel use (recommended for direct‑injection engines)
A well‑maintained example with lower mileage

Avoid If

Any sign of cold‑start rattle - this is the defining weakness of later engines
No evidence of regular oil changes - these engines are intolerant of neglect
Engine warning light with no diagnosis
Poor service history - these engines demand strict maintenance

Closing Verdict

The BMW 316i badge has spanned over 30 years and six generations of the 3 Series, from the simple M40 engine of the E30 to the modern B38 of the G20. The earlier M40 and M43 engines are robust and relatively simple, though ageing. The N42/N46 introduced VALVETRONIC but brought timing chain issues. The N13 (F30) is efficient and peppy but has a well‑documented timing chain vulnerability. Buy on service history above all else - a vehicle with documented timing chain maintenance and regular oil changes is a safe bet; a neglected example can be expensive to repair.

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

→ Compare 3 Series 316i engine prices before you buy

Don't Guess. Compare.

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→ Compare 3 Series 316i engine prices before you buy

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Thousands of 320d Owners Helped

Buying Checklist

Before you buy a used BMW 3 Series 316i (or before you commit to an engine replacement), check these:

1. Cold Start

Any rattle or whine? (timing chain warning - stop immediately)

2. Service History

Regular oil changes (10,000–12,000 miles) - this is non‑negotiable

3. Oil Leaks

Check under the vehicle and around the valve cover and oil filter housing

4. Running Quality

Any rough idle, hesitation, or power loss? (VANOS/VALVETRONIC)

5. Hot Start

Does it start cleanly when warm? (long cranking = HPFP warning)

6. Engine Warning Light

Have codes been read? Any timing, VANOS, or fuel pressure codes?

7. Oil Consumption

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

8. MOT History

Check for emissions‑related failures or any advisory notes

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.

M40B16 (1.6L I4)

Years1987–1994

Power102 PS (75 kW) / 140 Nm

2025 Enquiries- (pattern data)

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

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M40B16 (1.6L I4)1987–1994102 PS (75 kW) / 140 Nm- (pattern data)£800–£1,800 [PLACEHOLDER]

M43B16 (1.6L I4)1994–1998102 PS (75 kW) / 150 Nm- (pattern data)£900–£1,900 [PLACEHOLDER]

M43B19 (1.9L I4)1998–2001105 PS (77 kW) / 165 Nm- (pattern data)£1,000–£2,200 [PLACEHOLDER]

N42B18 (1.8L I4)2001–2004115 PS (85 kW) / 175 Nm- (pattern data)£1,400–£2,800 [PLACEHOLDER]

N46B18 (1.8L I4)2003–2005115 PS (85 kW) / 175 Nm- (pattern data)£1,400–£2,800 [PLACEHOLDER]

N45B16 (1.6L I4)2005–2007122 PS (90 kW) / 150 Nm- (pattern data)£1,600–£3,000 [PLACEHOLDER]

N43B16 (1.6L I4)2007–2011122 PS (90 kW) / 160 Nm- (pattern data)£1,600–£3,000 [PLACEHOLDER]

N13B16A (1.6L I4 Turbo)2012–2016136 PS (100 kW) / 220 Nm- (pattern data)£1,800–£3,500 [PLACEHOLDER]

B38 (1.5L I3 Turbo)2019–present136 PS (100 kW) / 220 Nm- (pattern data)£1,500–£3,800 [PLACEHOLDER]

Technical Specs

by generation

Displacement1,596 cc (M40/M43B16) / 1,895 cc (M43B19) / 1,796 cc (N42/N46) / 1,596 cc (N45/N43) / 1,598 cc (N13) / 1,499 cc (B38)

Cylinders4‑cylinder inline (M40/M43/N42/N46/N45/N43/N13) / 3‑cylinder inline (B38)

ValvetrainSOHC 8V (M40/M43) / DOHC 16V (N42/N46/N45/N43/N13/B38)

Fuel SystemEFI / Direct injection (N43/N13/B38)

AspirationNaturally aspirated (M40/M43/N42/N46/N45/N43) / Turbocharged (N13/B38)

→ Compare 3 Series 316i engine prices for your BMW

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Market Intelligence

Most Common Failure

Timing chain tensioner wear (N42/N46/N13)

the defining weakness of later 316is

Average Enquiry Mileage

60,000

–90,000 miles

[PATTERN DATA]

Average Replacement Cost

£2,200

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

N13B16A (F30)

most common modern 316i variant

[PATTERN DATA]

Peak Enquiry Season

Autumn/Winter

cold starts expose timing chain wear

[PATTERN DATA]

Regional Demand

South East20%

North West14%

London (12%) - 3 Series strongholds

PATTERN DATA

Regional Demand Breakdown

20%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.

Why UK BMW 3 Series 316i Owners Trust BMWEngines.uk

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every garage and engine rebuilder in our network is vetted, rated and reviewed by real 3 Series owners, as part of the Engine Finders network, covering every 316i engine generation from the M40 of the E30 to the modern B38 of the G20.
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see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who understand the differences between SOHC M40/M43 engines, VALVETRONIC N42/N46 units, and the turbocharged N13 and B38 variants.
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supply‑only or full supply & fit available nationwide, covering six generations of this badge from 1987 to the present day, with specialist knowledge of BMW's entry‑level engine family.

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12-Month Warranty

As standard

Nationwide Delivery

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