Engines Market

BMW Z4 22i SPECIALISTS

BMW Z4 22i Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW Z4 22i engine specialists. Compare prices on reconditioned, rebuilt and used M54B22 engines for your E85 roadster - supply & fit available nationwide.

Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
BMW Z4 22i Engine
from£1,200 to £2,600
  • Usedfrom £800
  • Reconditionedfrom £1,400
  • Common codesM54B22 (226S1)
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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW Z4 22i Engine History & Specs at a Glance

The BMW Z4 22i arrived in October 2003 as the entry-level straight-six variant of the E85 Z4 range, powered by the M54B22 2.2-litre naturally aspirated engine. Slotting between the 2.0i four-cylinder and the 2.5i/3.0i six-cylinder models, the 22i offered the smooth, refined character of BMW's inline-six at a more accessible price point. Production ran until October 2005, when the facelift E85 models transitioned to the N52 engine family.

BMW Z4 22i

  1. October 2003 - BMW Z4 22i (E85) launches with the M54B22 2.2-litre naturally aspirated straight-six petrol engine, producing 170hp and 210Nm of torque

  2. 2003

    2005 - Z4 22i production continues with the M54B22 engine unchanged; available with 5-speed manual or 5-speed automatic transmission

  3. October 2005 - Z4 22i discontinued as E85 facelift introduces N52 engine family; the 2.2-litre displacement is not carried over

Every engine fitted to the BMW Z4 22i is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW Z4 22i Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

M54B22 (226S1) — 2.2L Petrol (2003-2005) engine

M54B22 (226S1) — 2.2L Petrol (2003-2005)

Power Output
170hp (125kW) at 6,100rpm
Torque
210Nm at 3,500rpm
Displacement
2,171cc
Bore × Stroke
80.0mm × 72.0mm
Compression Ratio
10.8:1
Valvetrain
DOHC, 4 valves per cylinder, Double-VANOS
Years Fitted
2003-2005 (E85)

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Common Problems

BMW Z4 22i Engine Problems Repair Cost vs Replacement

The BMW Z4 22i is powered exclusively by the M54B22 2.2-litre straight-six - a smooth, characterful engine that shares its architecture with the larger M54B30. However, with production ending in 2005, all examples are now 20+ years old, and age-related failures are common. Every rebuilt M54B22 engine supplied through EnginesMarket includes upgraded components addressing the original failure points - plus a minimum 12-month unlimited mileage warranty.

Common failure points and repair options

CCV System Failure

Affected
BMW Z4 22i (M54B22, 2003-2005)
Typical failure mileage
60,000-100,000 miles
Root cause
The crankcase ventilation valve (CCV) system's oil separator diaphragm fails, allowing oil to be drawn into the intake manifold. This causes oil consumption, blue smoke from the exhaust, rough idle, and eventually catalytic converter damage if ignored.

Repair options

Repair tierDealer priceSpecialist price
Minor - CCV system replacement£500-£800£300-£550
Intermediate - CCV + intake manifold gaskets£700-£1,100£450-£750
Full Replacement - rebuilt/reconditioned engine (catastrophic oil starvation)£3,500-£5,000£2,200-£3,800
Our recommendation
If your Z4 22i shows signs of oil consumption or rough idle, have the CCV system inspected immediately. A £300-£550 specialist replacement is far cheaper than a £2,200-£3,800 engine rebuild. If the engine has already suffered oil starvation and bearing damage, only a full rebuilt engine will save the car.
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VANOS Seal Failure

Affected
BMW Z4 22i (M54B22, 2003-2005)
Typical failure mileage
60,000-100,000 miles
Root cause
The double-VANOS system uses rubber seals that harden and shrink over time. This allows oil pressure to bleed off, reducing the system's ability to advance or retard cam timing. Symptoms include hesitation on acceleration, loss of low-end torque, poor fuel economy, and a rattling noise from the front of the engine.

Repair options

Repair tierDealer priceSpecialist price
Minor - VANOS seal replacement£600-£900£350-£650
Intermediate - VANOS rebuild + timing chain guides£1,200-£1,800£750-£1,200
Full Replacement - rebuilt/reconditioned engine (catastrophic timing failure)£3,500-£5,000£2,200-£3,800
Our recommendation
VANOS seal failure is one of the most common M54 issues, but it's also one of the cheapest to fix. A £350-£650 specialist seal replacement using upgraded Teflon seals restores full performance and is significantly cheaper than engine replacement. If your Z4 22i feels flat below 3,000rpm, have the VANOS system inspected before considering more expensive repairs.
-> Compare rebuilt M54B22 BMW Z4 22i engine prices

Cooling System Failure

Affected
BMW Z4 22i (M54B22, 2003-2005)
Typical failure mileage
60,000-90,000 miles
Root cause
The M54's cooling system uses plastic components - water pump impeller, thermostat housing, and expansion tank - that become brittle with age. Failure leads to coolant loss, overheating, and potentially a warped cylinder head or cracked block.

Repair options

Repair tierDealer priceSpecialist price
Preventative - cooling system overhaul£700-£1,000£450-£750
Intermediate - head gasket replacement£1,200-£1,800£800-£1,400
Full Replacement - rebuilt/reconditioned engine (cracked head / block)£3,500-£5,000£2,200-£3,800
Our recommendation
On a 20+ year-old Z4 22i, preventative cooling system overhaul is essential. For under £750 at a specialist, you can replace all critical cooling components and avoid the risk of overheating. If your Z4 has already overheated and the head gasket has failed, a specialist head gasket replacement (£800-£1,400) is viable if the head isn't cracked. If the head is cracked, only a full rebuilt engine will save the car.
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Oil Leaks

Affected
BMW Z4 22i (M54B22, 2003-2005)
Typical failure mileage
60,000-120,000 miles
Root cause
The valve cover gasket and oil filter housing gasket harden and shrink over time, allowing oil to seep out. Oil drips onto the exhaust manifold, creating a burning smell, and can eventually lead to low oil levels and engine damage.

Repair options

Repair tierDealer priceSpecialist price
Minor - valve cover gasket replacement£300-£500£200-£350
Intermediate - oil filter housing gasket replacement£400-£600£250-£400
Full Replacement - rebuilt/reconditioned engine (oil starvation)£3,500-£5,000£2,200-£3,800
Our recommendation
Oil leaks on the M54B22 are rarely catastrophic if caught early. The valve cover gasket is the most common and cheapest to fix - address it as soon as you notice the burning oil smell or oil spots. The oil filter housing gasket is next most common and should be replaced promptly to prevent oil dripping onto the serpentine belt. On a Z4 22i, regular oil level checks are essential - don't rely solely on the electronic sensor.
-> Compare rebuilt M54B22 BMW Z4 22i engine prices

Don't Let Engine Failure Write Off Your BMW Z4 22i

A failed M54B22 engine doesn't have to mean the end of the road for your Z4 22i. Whether you're facing CCV system failure, VANOS seal degradation, cooling system issues, or oil leaks, EnginesMarket connects you with trusted UK BMW specialists who supply rebuilt M54B22 engines with upgraded components specifically designed to address these original failure points. Every engine comes with a minimum 12-month unlimited mileage warranty, nationwide delivery, and supply & fit options across the UK. Compare prices today - and keep your E85 roadster on the road without paying the main dealer premium.

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FAQ

BMW Z4 22i Engine ReplacementFrequently Asked Questions

Everything BMW Z4 22i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare BMW Z4 22i Engine Prices Today

Comparing quotes for your BMW Z4 22i is free, no-obligation, and specific to your exact engine code and vehicle. Enter your registration above - our trusted UK network of BMW E85 specialists will send you tailored prices for used, reconditioned, and rebuilt M54B22 engines with warranty. Keep your E85 roadster on the road without paying the dealer premium.

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