How much does a BMW Z4 2.0i / 2.2i engine replacement cost in the UK?

A reconditioned Z4 2.0i/2.2i engine typically costs £1,500–£3,500 supply only depending on generation. Fitting adds £1,000–£1,500 depending on location and workshop rates. A used N46B20B engine from a specialist costs approximately £1,295.65 including VAT and delivery. Main dealer new engines are no longer available for these older engine families. Use our calculator for a figure specific to your car.

Is the BMW Z4 2.0i / 2.2i engine reliable?

It depends on which engine your Z4 has. The M54B22 (2.2i, 2003–2005) is a straight-six that is 'really very reliable' and with proper maintenance can last over 350,000 km. The N46B20 (2.0i, 2005–2008) is generally reliable, but timing chain guide failure is a documented concern. Check the Era Map above for your specific engine.

What are the common problems with the BMW Z4 2.0i / 2.2i?

The main known issues are: (1) Timing chain guide failure on the N46 four-cylinder - causing cold-start rattle and risk of catastrophic engine damage, (2) DISA valve failure on the M54 - causing loss of torque and rattling from the intake, (3) Oil leaks from the valve cover gasket and oil filter housing on both engines, and (4) Cooling system failures - water pump, thermostat and expansion tank.

Is it worth replacing a BMW Z4 2.0i / 2.2i engine, or should I scrap the car?

Depends on vehicle value and condition. Against a well-kept £3,000–£7,000 Z4, a £2,500 recon is 35–80% of the car's value. For a clean M54 2.2i example, replacement is almost always worth it given the engine's legendary durability and the Z4's strong following. For N46 2.0i examples with no chain history, evaluate the car's overall condition before committing.

How do I find my BMW Z4 2.0i / 2.2i engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: 2003–2005 2.2i models have the M54B22 (straight-six, 170 hp); 2005–2008 2.0i models have the N46B20 (four-cylinder, 150 hp). Tell us your registration date and we'll confirm it for free.

Can I repair the N46 timing chain, or does it need replacement?

Yes - if caught early. A preventative chain replacement (£800–£2,000) is far cheaper than a catastrophic chain slip (£2,500–£5,500 engine replacement). At the first sign of cold-start rattle, book an inspection immediately. The N46 is an interference engine - if the chain slips, valves will hit pistons.

BMW Z4 2.0i / 2.2i2003–20082 Engine Generations (N46 & M54)

BMW Z4 2.0i / 2.2i Engine Replacement — Compare Prices & Get Quotes

Name: BMW Z4 2.0i/2.2i UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW Z4 specialists. The 2.0i and 2.2i badges span two distinct engine generations - the four-cylinder N46 and the smooth six-cylinder M54 - compare reconditioned, rebuilt and used engines with supply & fit available nationwide.

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BMW Z4 2.0i / 2.2i Engines - from £600 to £5,500Common codes: N46B20, M54B22

BMW Z4 2.0i / 2.2i Engines - from £600 to £5,500· Common codes: N46B20, M54B22

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BMW Z4 2.0i / 2.2i - Which Engine Does Your Car Actually Have?

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

Era Note

2.2L straight-six, 170 hp - buttery smooth, very reliable; DISA & VANOS seals are main weak points

GenerationYearsEngine CodeReliabilityRecon CostEra Note

E85 (2.2i) BMW 320d E85 (2.2i)

2003–2005M54B22★★★★★ [NEWLY ASSIGNED - see Data Note]£1,800–£3,500 [PLACEHOLDER]2.2L straight-six, 170 hp - buttery smooth, very reliable; DISA & VANOS seals are main weak points

E85 (2.0i) BMW 320d E85 (2.0i)

2005–2008N46B20★★★★☆ [NEWLY ASSIGNED - see Data Note]£1,500–£3,500 [PLACEHOLDER]2.0L four-cylinder, 150 hp - lighter and more efficient; N42/N46 chain guide issues less common but documented

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 UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW Z4 2.0i / 2.2i Engine Replacement Costs

Supply Only£1,500–£3,500

Fitted (Indie)£2,500–£4,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£600–£1,500£1,200–£2,5001–6 monthsBudget priority; donor for rebuild

Reconditioned Engine£1,500–£3,500£2,500–£4,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£2,500–£4,500£3,500–£5,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer NewN/AN/AN/ANo longer manufactured

Labour estimate: Fitting a Z4 2.0i/2.2i engine typically takes 10–14 hours at £65–£95/hr (independent). Timing chain replacement on the N46 requires specialist attention.

→ Compare Z4 2.0i / 2.2i engine prices from UK specialists

Common Problems With BMW 320d Engines

1. Timing Chain Guide Failure (N46 2.0i, 2005–2008)

Symptoms: Rattling or slapping noise from the front of the engine on cold start, metallic ticking, rough idling, loss of power, engine warning light

Typical mileage: 60,000–100,000 miles - documented on N42/N46 engines

Repair cost: £800–£2,000 (chain kit, guides and tensioners)

Replacement cost: £2,500–£5,500 (if chain slips - full engine replacement)

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

Our recommendation:

The N46 four-cylinder engine has a documented issue with timing chain guides breaking. One owner reported: "I've seen the oil pickup get clogged up on more than one 2.0 N42 engine when the timing chain tensioner has been at fault and the guides have been breaking". If the chain slips, valves can hit pistons - this is an interference engine. At the first sign of cold-start rattle, get the chain inspected immediately. A £800–£2,000 preventative repair is dramatically cheaper than a £2,500–£5,500 engine replacement.

Read the full timing chain failure guide → /failures/n46-timing-chain/ [NEW FAILURE PAGE NEEDED]

1. Timing Chain Guide Failure (N46 2.0i, 2005–2008)

Symptoms: Rattling or slapping noise from the front of the engine on cold start, metallic ticking, rough idling, loss of power, engine warning light

Typical mileage: 60,000–100,000 miles - documented on N42/N46 engines

Repair cost: £800–£2,000 (chain kit, guides and tensioners)

Replacement cost: £2,500–£5,500 (if chain slips - full engine replacement)

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

Our recommendation:

Read the full timing chain failure guide → /failures/n46-timing-chain/ [NEW FAILURE PAGE NEEDED]

2. DISA Valve Failure (M54 2.2i, 2003–2005)

Symptoms: Loss of low-end torque, loss of top-end power, rattling noise from the intake manifold, reduced fuel economy, hesitation on acceleration

Typical mileage: 60,000–100,000 miles

Repair cost: £200–£500 (DISA valve replacement or rebuild)

Replacement cost: N/A - repair only (does not progress to engine replacement if addressed)

🟡 Monitor - book inspection if symptoms develop

Our recommendation:

The M54 engine's DISA (Differenzierte Sauganlage) valve can fail, causing a rattle from the inlet manifold and a noticeable loss of either low-end torque or top-end power. A broken DISA flap can send debris into the engine - it's a well-known weak point on the M54. If you experience a loss of performance or hear a rattle from the intake, have the DISA valve inspected. Rebuild kits are available, or the entire unit can be replaced.

Read the full DISA valve failure guide → /failures/disa-valve-failure/ [NEW FAILURE PAGE NEEDED]

3. Oil Leaks (Both Engines)

Symptoms: Burning oil smell from engine bay, visible oil residue around the engine, oil spots under the car, low oil level warning

Typical mileage: 60,000–100,000 miles

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

Replacement cost: N/A - repair only (does not progress to engine replacement if addressed)

🟡 Monitor - book inspection if you notice oil spots or burning smell

Our recommendation:

Oil leaks are "a frequent complaint among Z4 owners". Common leak points include the valve cover gasket and oil filter housing gasket on both the N46 and M54 engines. On the M54, the oil filter housing gasket is a known weak point. If left unaddressed, oil leaks can lead to low oil levels and potential engine damage. If you notice a burning smell or oil spots, have the gaskets inspected promptly.

Read the full oil leak guide → /failures/oil-leaks-n46-m54/ [NEW FAILURE PAGE NEEDED]

4. Cooling System Failures (Both Engines)

Symptoms: Overheating, coolant loss, steam from engine bay, temperature gauge rising, heater blowing cold

Typical mileage: 60,000–100,000 miles

Repair cost: £400–£1,000 (water pump, thermostat, expansion tank)

Replacement cost: N/A - repair only (does not progress to engine replacement if addressed)

🟠 Check - book inspection urgently if temperature rises

Our recommendation:

Cooling system failures are a significant concern on both engines. Common problems include water pump failure, cracked plastic housings, and expansion tank leaks. Overheating can lead to severe engine damage, so it's crucial to address any cooling issues promptly. Preventative replacement of the water pump and thermostat at 60,000–80,000 miles is strongly recommended.

Read the full cooling system failure guide

Weighing Your Options?

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Z4 2.0i / 2.2i - 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.

Z4 2.0i / 2.2i - 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 rattle (N46, early detection)✅ Yes£800–£2,000Preventative - catches the fault before catastrophic failureTiming chain snapped (N46)❌ Usually NoEngine replacementInterference engine - piston-valve contact means full replacement requiredDISA valve failure (M54)✅ Yes£200–£500Straightforward component replacement or rebuildOil leaks (gaskets)✅ Yes£300–£800Catch early to prevent oil contamination and engine damageCooling system failure✅ Yes£400–£1,000Preventative replacement recommended at 60k–80k miles

Buying This Z4 2.0i / 2.2i? Check These First

Buy If

M54-engined car (2003–2005 2.2i) - these straight-sixes are "really very reliable"
Documented cooling system refresh (water pump, thermostat, expansion tank)
Full service history with regular oil changes
No timing chain rattle on cold start (N46 cars)

Avoid If

N46-engined car (2005–2008 2.0i) with cold-start rattle and no chain history
DISA valve rattle from the intake manifold with no documented fix (M54)
Overheating history or cooling system issues
Poor service history - BMW engines are reliable but need proper maintenance

Closing Verdict

The Z4 2.0i and 2.2i offer two very different driving experiences. The M54 2.2i is a buttery-smooth straight-six that delivers 170 hp with genuine character and "really very reliable" performance. The N46 2.0i is a lighter, more efficient four-cylinder that replaced the 2.2i in 2005. The M54's weaknesses are well-understood - DISA valve, VANOS seals, and oil leaks - and are manageable. The N46's timing chain guide failure is the more critical concern. Buy a well-maintained M54 if you want the classic six-cylinder experience. Buy on documented history, not on price alone.

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

→ Compare Z4 2.0i / 2.2i engine prices before you buy

Don't Guess. Compare.

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

→ Compare Z4 2.0i / 2.2i engine prices before you buy

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Buying Checklist

Before you buy a used BMW Z4 2.0i or 2.2i (or before you commit to an engine replacement), check these:

Cold Start

Listen for rattling or slapping noise from the front of the engine (timing chain - N46)

DISA Valve

Any rattling from the intake manifold or loss of low-end torque? (M54)

Oil Leaks

Look for oil residue around the valve cover and oil filter housing

Cooling System

Check for coolant leaks; ask about water pump and thermostat history

Service History

Including which engine (N46 or M54) and confirmed oil change intervals

VANOS

Any hesitation or flat spots in the power band? (M54)

Engine Warning Light

Have codes been read? Look for DISA, VANOS or timing-related codes

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.

N46B20

Years2005–2008

Power150 hp (110 kW) / 200 Nm

2025 Enquiries- (pattern data)

Avg. Recon Cost£1,500–£3,500【PLACEHOLDER】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N46B202005–2008150 hp (110 kW) / 200 Nm- (pattern data)£1,500–£3,500【PLACEHOLDER】

M54B222003–2005170 hp (125 kW) / 210 Nm- (pattern data)£1,800–£3,500【PLACEHOLDER】

Technical Specs

M54B22

Displacement1,995 cc (2.0L)

Cylinders4-cylinder inline

Bore84.0 mm / Stroke: 90.0 mm

Compression Ratio10.5:1

ValvetrainDOHC, 4 valves per cylinder, chain-driven, Valvetronic

Power110 kW (150 hp) @ 6,200 rpm

Torque200 Nm @ 3,600 rpm

0-62 mph8.2 seconds

Top Speed220 km/h (137 mph)

Displacement2,171 cc (2.2L)

Cylinders6-cylinder inline

Bore80.0 mm / Stroke: 72.0 mm

Compression Ratio10.8:1

ValvetrainDOHC, 4 valves per cylinder, chain-driven, Double-VANOS

Power125 kW (170 hp) @ 6,100 rpm

Torque210 Nm @ 3,500 rpm

0-62 mph7.7 seconds

Top Speed225 km/h (140 mph)

→ Compare Z4 2.0i / 2.2i engine prices for your BMW

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Market Intelligence

Most Common Failure

Timing chain guide failure on N46 four-cylinder engines

a documented weakness on the N42/N46 family【PATTERN DATA】

Average Enquiry Mileage

60,000

–100,000 miles【PATTERN DATA】

Average Replacement Cost

£2,500

reconditioned, supply only【PLACEHOLDER】

Most Requested Engine Code

M54B22 (the smooth six-cylinder)【PATTERN DATA】

Peak Enquiry Season

Spring / Summer

convertible owners prepare for driving season【PATTERN DATA】

Regional Demand

South East18%

South West15%

London (12%)【PATTERN DATA】

Regional Demand Breakdown

18%South East

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.

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12-Month Warranty

As standard

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