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.

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

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

Instant Quotes
No Obligation
100% Free
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 Z4 2.0i / 2.2i — Which Engine Does Your Car Actually Have?

Two generations. Two 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

Era Note

2.0L four-cylinder, 150 hp — lighter and more efficient; N42/N46 chain guide issues less common but documented

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
E85 (2.2i)	2003–2005	M54B22		£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)	2005–2008	N46B20		£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 UKCost Data
VerifiedReliability
ExpertInsights
Updated for2025

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 Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£600 – £1,500	£1,200 – £2,500	1–6 months	Budget priority; donor for rebuild
Reconditioned Engine	£1,500 – £3,500	£2,500 – £4,500	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£2,500 – £4,500	£3,500 – £5,500	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	N/A	N/A	N/A	No 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 Z4 2.0i / 2.2i 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)
Urgency: 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] /failures/timing-chain-diagnosis-guide

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)
Urgency: 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] /failures/timing-chain-diagnosis-guide

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)
Urgency: 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] /failures

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)
Urgency: 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] /failures/n55-valve-cover-oil-leak

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)
Urgency: 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 /failures/m54-cooling-system

Weighing Your Options?

Compare Specialist Quotes When You're Ready

20+ vetted BMW specialists, every Z4 2.0i/2.2i engine covered, with a 12-month warranty as standard.

See Z4 2.0i / 2.2i Engine Options

Z4 2.0i / 2.2i — 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 rattle (N46, early detection)	Yes	£800 – £2,000	Preventative — catches the fault before catastrophic failure
Timing chain snapped (N46)	Usually No	Engine replacement	Interference engine — piston-valve contact means full replacement required
DISA valve failure (M54)	Yes	£200 – £500	Straightforward component replacement or rebuild
Oil leaks (gaskets)	Yes	£300 – £800	Catch early to prevent oil contamination and engine damage
Cooling system failure	Yes	£400 – £1,000	Preventative replacement recommended at 60k–80k miles

ProblemRepairable? · Typical Cost

Timing chain rattle (N46, early detection)

Yes£800 – £2,000

Preventative — catches the fault before catastrophic failure

Timing chain snapped (N46)

Usually NoEngine replacement

Interference engine — piston-valve contact means full replacement required

DISA valve failure (M54)

Yes£200 – £500

Straightforward component replacement or rebuild

Oil leaks (gaskets)

Yes£300 – £800

Catch early to prevent oil contamination and engine damage

Cooling system failure

Yes£400 – £1,000

Preventative 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. Compare.

Get real quotes from vetted UK specialists and make the right call for your Z4 2.0i / 2.2i.

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

20+ Vetted SpecialistsUK Network
12-Month Warrantyas Standard
Nationwide Delivery& Collection
Transparent PricingNo Hidden Fees
Thousands of Z4 2.0i / 2.2iOwners Helped

Buying Checklist

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

1. Cold Start
Listen for rattling or slapping noise from the front of the engine (timing chain — N46)
2. DISA Valve
Any rattling from the intake manifold or loss of low-end torque? (M54)
3. Oil Leaks
Look for oil residue around the valve cover and oil filter housing
4. Cooling System
Check for coolant leaks; ask about water pump and thermostat history
5. Service History
Including which engine (N46 or M54) and confirmed oil change intervals
6. VANOS
Any hesitation or flat spots in the power band? (M54)
7. Engine Warning Light
Have codes been read? Look for DISA, VANOS or timing-related codes
8. MOT History
Check for emissions-related failures

Why this matters

A 10-minute check now can save you thousands later. The right Z4 2.0i / 2.2i is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

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

1
Cold Start
Listen for rattling or slapping noise from the front of the engine (timing chain — N46)
2
DISA Valve
Any rattling from the intake manifold or loss of low-end torque? (M54)
3
Oil Leaks
Look for oil residue around the valve cover and oil filter housing
4
Cooling System
Check for coolant leaks; ask about water pump and thermostat history
5
Service History
Including which engine (N46 or M54) and confirmed oil change intervals
6
VANOS
Any hesitation or flat spots in the power band? (M54)
7
Engine Warning Light
Have codes been read? Look for DISA, VANOS or timing-related codes
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 Z4 2.0i / 2.2i pitfalls.

Engine Codes

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

N46B20

Years: 2005–2008
Power: 150 hp (110 kW) / 200 Nm
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £1,500–£3,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
N46B20	2005–2008	150 hp (110 kW) / 200 Nm	—(pattern data)	£1,500–£3,500[PLACEHOLDER]
M54B22	2003–2005	170 hp (125 kW) / 210 Nm	—(pattern data)	£1,800–£3,500[PLACEHOLDER]

Technical SpecsM54B22

Displacement: 1,995 cc (2.0L)
Cylinders: 4-cylinder inline
Bore: 84.0 mm / Stroke: 90.0 mm
Compression Ratio: 10.5:1
Valvetrain: DOHC, 4 valves per cylinder, chain-driven, Valvetronic
Power: 110 kW (150 hp) @ 6,200 rpm
Torque: 200 Nm @ 3,600 rpm
0-62 mph: 8.2 seconds
Top Speed: 220 km/h (137 mph)
Displacement: 2,171 cc (2.2L)
Cylinders: 6-cylinder inline
Bore: 80.0 mm / Stroke: 72.0 mm
Compression Ratio: 10.8:1
Valvetrain: DOHC, 4 valves per cylinder, chain-driven, Double-VANOS
Power: 125 kW (170 hp) @ 6,100 rpm
Torque: 210 Nm @ 3,500 rpm
0-62 mph: 7.7 seconds
Top Speed: 225 km/h (140 mph)

Compare Z4 2.0i / 2.2i engine prices for your BMWGet quotes from trusted UK specialists in minutes.

Market Intelligence

Real data from thousands of Z4 2.0i / 2.2i enquiries in 2025.

Most Common FailureTiming 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 East: 18%
South West: 15%
London: 12%
Other Regions: 55%

[PATTERN DATA]

Regional Demand Breakdown

12%London18%South East15%South West55%Other Regions

Frequently Asked Questions

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.

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.

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.

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.

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.

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.

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.

Why UK BMW Z4 2.0i / 2.2i Owners Trust BMWEngines.uk

Trusted Z4 2.0i/2.2i Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real Z4 owners, across both N46 and M54 engine generations, as part of the Engine Finders network.
Compare Z4 Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit.
UK Engine Replacement Services for Z4 2.0i/2.2i
supply-only or full supply & fit available nationwide, covering every E85 Z4 since 2003.

Find the best BMW Z4 2.0i / 2.2i engine replacement UK drivers rely on.

Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Explore BMW Z4 2.0i / 2.2i Engine Quotes

100% FreeNo hidden fees
No ObligationGet quotes with zero pressure
UK Specialists20+ vetted experts
12-Month WarrantyAs standard
Nationwide DeliverySupply & fit available

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

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

BMW Z4 2.0i / 2.2i Engine Replacement Costs

Common Problems With BMW Z4 2.0i / 2.2i Engines

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

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

3. Oil Leaks(Both Engines)

4. Cooling System Failures(Both Engines)

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

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

3. Oil Leaks(Both Engines)

4. Cooling System Failures(Both Engines)

Weighing Your Options?

Z4 2.0i / 2.2i — Repair, Buy, or Replace?

Can It Be Repaired?

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

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW Z4 2.0i / 2.2i Owners Trust BMWEngines.uk

Trusted Z4 2.0i/2.2i Engine Suppliers

Compare Z4 Engine Replacement Companies

UK Engine Replacement Services for Z4 2.0i/2.2i

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