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BMW Z4 Z4 roadster 2.5i common faults.

2003–2006, convertible, petrol, 192 HP.

The fault list covers: M54B25 engine, GM5L40 transmission.

What you save stays on this device only. My saves

5 fault write-ups. All are important. 9 recalls.

If you know the year, pick it. Faults for other years drop out of the list.

Before you buy

Known faults

5 important faults

critical2

M54: the crankcase breather valve sticks, its lines break and oil is used up

critical

The crankcase breather valve and its four lines often fail. The valve sticks open and the lines break, and both let false air in. The valve and the lines last between 110,000 and 200,000 km and typically fail around 150,000. In cold weather the fault develops faster, because the condensing vapour freezes in the valve and blocks it. The symptoms are oil being used up, a rough idle and blue smoke, and a dense vapour can also appear at the front under the bonnet. If the drain of the valve blocks, the burnt oil mist also leans out the mixture and the engine fault light comes on. Left untreated it can end in engine damage. There are two tests for it, and both can be done at a viewing. With a warm engine at idle, lay a flat plastic bag over the oil filler opening. If the bag stays up or is only drawn in by 2 to 3 cm, the valve is fine. If it is drawn in strongly, the valve has stuck open. With a cold, stopped engine take the breather line off at the front corner of the cam cover and blow into it: you should hear bubbling in the sump. If you do not hear it, one of the lines has broken or the drain in the dipstick tube has blocked.

between 110,000 and 200,000 km

What to check

  • With a warm engine at idle lay a flat plastic bag over the oil filler and watch whether it is drawn in
  • With a cold engine blow into the breather line: there has to be bubbling in the sump
  • Ask how much oil has to be added between two changes
2 more steps in the write-up

M54: the DISA valve breaks and its parts can enter the engine

critical

The DISA valve is the black box on the side of the intake manifold, and it adjusts the length of the intake so that there is more torque at low revs. The shaft of the valve breaks at its base, and then the flap falls off: the pieces can get into the engine and cause major damage there. Its membrane can tear separately as well. The symptoms are juddering on acceleration and a noticeable loss of power, and the valve can also hiss loudly after the engine is switched off. The seal of the intake connection is cast into the DISA, and as it shrinks it lets false air in. Its condition can be checked with the valve removed. The flap has to turn against resistance, spring back when released, and have no play. With the vent hole at the bottom of the round valve held closed, a flap moved by hand may only spring open to 45 degrees and then has to stop. With an aftermarket DISA the experience is that the trouble is back after a year, so a repair kit or a reconditioned factory part is the better choice.

above 120,000 km

What to check

  • On acceleration watch for juddering and loss of power at low revs
  • Switch the engine off and listen for hissing from the side of the intake
  • Ask whether the DISA has been touched, and whether it is a factory, reconditioned or aftermarket part
2 more steps in the write-up

expensive3

M54: worn VANOS seals and a cold rattle

expensive

The seals in the camshaft adjuster (VANOS) age, and the rattling noise is most noticeable from cold, right after starting. The noise fades or disappears as the engine warms up.

Show the rest

With worn seals the cam timing becomes imprecise, which leaves the engine flatter low down and raises consumption. The fault appears between 60,000 and 150,000 kilometres.

between 60,000 and 150,000 km

What to check

  • Start it from cold and listen to the first minutes: the rattle comes from the camshaft area
  • Watch whether the noise fades as it warms up: that is typical of VANOS
  • Accelerate from low revs: flat running points the same way
1 more steps in the write-up

Water pump: a worn bearing, a disintegrating impeller, overheating without warning

expensive

The impeller of the belt-driven water pump is made of plastic, and if the blades break apart, there is nothing left to circulate the coolant. The belt keeps driving the pump, but the engine gets no cooling and heats up quickly.

Show the rest

This fault is dangerous because it gives no advance sign. There is no warning signal from a disintegrating impeller, and the engine temperature runs up faster than the gauge can follow; by the time it shows, the cylinder head can already be damaged. The breaking impeller is a fault of its own on the six-cylinder built between 1992 and 1995, which is why the maker went back to a metal impeller, and then used a composite impeller in the later engines, which proved more durable. A pump with a metal impeller is still available today, as a durability replacement.

There is, however, one sign that can be caught before the failure: play developing in the shaft of the pump. That means the bearing is wearing, and because the impeller sits on this shaft, play in the shaft signals the coming end of the pump. With the belt off it can be felt by hand.

On the M54 it appears at around 120 000 and on the N62 at around 150 000 kilometres. Once the engine has overheated, the consequence stays: a warped cylinder head and a damaged gasket are no longer put right by replacing the pump.

between 120,000 and 150,000 km

What to check

  • With the belt off take hold of the water pump shaft: play means the bearing is wearing
  • Watch the temperature gauge both while driving and at a standstill: it should not climb above the usual
  • Ask when the water pump was replaced, and whether with a metal or a composite impeller
2 more steps in the write-up

M54: a failing VANOS solenoid valve and fluctuating revs at low rpm

expensive

The VANOS solenoid valves fail sooner or later, and that gives fluctuating revs and a noticeable loss of power at low rpm, sometimes starting trouble as well. The valve itself is not always the fault: the contacts of the connector can widen or oxidise, and then there is no proper contact. An aged camshaft or crankshaft sensor can cause the same. Oil can seep along it into the wiring harness, and capillary action carries it towards the control unit. From there a VANOS fault code, a lambda fault and misfires can follow. A widespread misconception is worth stating here. The rattling heard on a cold start is NOT an indication of the condition of the VANOS: the noise comes from the play in the needle bearings, which every VANOS has, only not every drivetrain resonates with it. Anyone who concludes the VANOS is fine because it does not rattle is concluding wrongly.

What to check

  • At low revs watch for fluctuating revs and a lack of power
  • Read the fault memory and look for the camshaft timing codes
  • Do not judge the VANOS by the cold rattle, because that is not what it indicates
2 more steps in the write-up

Checklist

BMW Z4 Z4 roadster 2.5i

First what you would check on any car. Then the faults of this model.

Before you buy

Checklist

The printed sheet starts with what you would check on any car. What you tick stays on this device only.

On every car

Ask the owner

Faults of this model

vinkodex.com · Before you buy it, see what can go wrong.

Official recall9 recallsShow

The manufacturer fixes these for free at a franchised dealer. Ask with the VIN whether it was done.

Most recent: 2 March 2022

22V119000ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV)ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV)2 March 2022 · NHTSA (USA)

BMW of North America, LLC (BMW) is recalling certain 2008-2013 1 Series Coupe (128i); 2007-2013 3 Series Coupe (328i, 328xi, 328i xDrive); 2007-2010 X3 SAV (X3 3.0si, X3 xDrive30i); 2008-2013 1 Series Convertible (128i); 2006-2011 3 Series Sedan (325i, 325xi, 328i, 328xi, 328i xDrive, 330i, 330xi); 2006-2012 3 Series Wagon (328i, 328i xDrive); 2007-2013 3 Series Convertible (328i); 2006-2010 5 Series Sedan (525i, 525xi, 528i, 528xi, 530i, 530xi); 2006-2007 5 Series Wagon (530xi); 2007-2010 X5 SAV (X5 3.0si, X5 xDrive30i); 2006-2008 Z4 Coupe (Z4 3.0si); and 2006-2011 Z4 Roadster (Z4 3.0i, Z4 3.0si, Z4 sDrive30i) vehicles. The heater for the positive crankcase ventilation (PCV) valve may short circuit.

Risk: An electrical short can cause the PCV valve heater to overheat, increasing the risk of a fire while driving or, soon after driving when parked.

Remedy: This recall supersedes and expands previous NHTSA recalls 17V-683 and 19V-273. Dealers will install an electrical wiring harness with fuse protection for the PCV Valve heater in potentially affected vehicles, free of charge. This recall supersedes and expands previous NHTSA recalls 17V-683 and 19V-273. Vehicles previously repaired under the prior recalls will need to come back for the new recall remedy. The remedy is currently being developed. Interim owner notification letters informing owners of the safety risk were mailed on April 1, 2022. Owner notification letters were mailed on July 22, 2022. Owners may contact BMW customer service at 1-800-525-7417.

We could not check this: model year. The authority's notice

19V273000ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV)ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV)4 April 2019 · NHTSA (USA)

BMW of North America, LLC (BMW) is recalling certain 2006 525i, 525xi, 530i, 530xi, 530xi Sports Wagon, 325i, 325xi, 325xi Sports Wagon, 330i, 330xi, Z4 3.0i and Z4 3.0si vehicles. The heater for the positive crankcase ventilation (PCV) valve may short circuit.

Risk: An electrical short can cause the parts within the PCV valve to melt, increasing the risk of a fire, even when the vehicle is not in use.

Remedy: BMW will notify owners, and dealers will replace the PCV valve heater, free of charge. The recall began May 30, 2019. Owners may contact BMW customer service at 1-800-525-7417. Note: This recall is an expansion to recall 17V-683.

We could not check this: model year. The authority's notice

17V683000ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV)ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV)30 October 2017 · NHTSA (USA)

BMW of North America, LLC (BMW) is recalling certain 2008-2011 128i and 2007-2011 328i, 328xi, 328i xDrive, 525i, 525xi, 528i, 528xi, 530i, 530xi, X3 3.0si, X3 xDrive30i, X5 xDrive30i, Z4 3.0i, Z4 3.0si and Z4 sDrive30i vehicles. The heater for the positive crankcase ventilation (PCV) valve may short circuit.

Risk: An electrical short can cause the parts within the PCV valve to melt, increasing the risk of a fire, even when the vehicle is not in use.

Remedy: BMW will notify owners, and dealers will replace the PCV valve heater, free of charge. Interim letters were mailed on November 27, 2017. Owners will receive a second notification by the end of October 2018. Owners may contact BMW customer service at 1-800-525-7417.

We could not check this: model year. The authority's notice

04V247000AIR BAGSAIR BAGS24 May 2004 · NHTSA (USA)

ON CERTAIN PASSENGER VEHICLES, INCOMPATIBLE ELECTRONIC AIR BAG SYSTEM PROCESSORS MAY HAVE BEEN INSTALLED.

Risk: IN THE EVENT OF A CRASH, AIR BAG DEPLOYMENT MAY NOT OCCUR, INCREASING THE RISK OF INJURIES TO THE DRIVER AND/OR FRONT PASSENGER.

Remedy: DEALERS WILL INSPECT AND, IF NECESSARY, REPLACE THE AIR BAG SYSTEM PROCESSORS. THE RECALL BEGAN JUNE 11, 2004. OWNERS SHOULD CONTACT BMW AT 1-800-831-1117.

We could not check this: model year. The authority's notice

04V182000FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMPFUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP12 April 2004 · NHTSA (USA)

ON CERTAIN PASSENGER VEHICLES, UNDER CERTAIN ENVIRONMENTAL CONDITIONS, A VAPOR LOCK IN THE FUEL PUMP COULD OCCUR CAUSING THE ENGINE TO STALL. IF THIS WERE TO HAPPEN, THE ENGINE WOULD NOT BE ABLE TO BE RESTARTED FOR APPROXIMATELY 15 TO 20 MINUTES.

Risk: IF STALLING WERE TO OCCUR, THE DRIVER WOULD BE UNABLE TO MAINTAIN VEHICLE SPEED OR ACCELERATE, INCREASING THE RISK OF A CRASH.

Remedy: DEALERS WILL INSTALL A RESISTOR IN THE ELECTRICAL LINE POWERING THE FUEL PUMP IN ORDER TO PREVENT AN OCCURRENCE OF VAPOR LOCK. THE RECALL BEGAN MAY 11, 2004. OWNERS SHOULD CONTACT BMW AT 1-800-831-1117.

We could not check this: model year. The authority's notice

03V214000TIRESTIRES9 June 2003 · NHTSA (USA)

ON CERTAIN VEHICLES EQUIPPED WITH 18" TIRES, IT IS POSSIBLE THAT THE TIRE HAS BEEN DAMAGED DURING THE MOUNTING PROCESS TO THE RIM.

Risk: CONSEQUENTLY, A LOSS OF TIRE PRESSURE, OR A TIRE FAILURE, COULD OCCUR. DEPENDING ON TRAFFIC CONDITIONS AND THE DRIVER'S REACTIONS, THIS COULD LEAD TO A CRASH.

Remedy: DEALERS WILL UNSEAT THE TIRE FROM ITS RIM, INSPECT FOR ANY DAMAGE, AND THEN RESEAT THE TIRE TO ITS RIM. IF INSPECTION REVEALS THAT A FRONT TIRE HAS INCURRED DAMAGE DURING THE MOUNTING PROCESS, IT WILL BE REPLACED. OWNER NOTIFICATION BEGAN JULY 14, 2003. OWNERS SHOULD CONTACT BMW AT 1-800-831-1117.

We could not check this: model year. The authority's notice

03V032000SEAT BELTS:FRONT:BUCKLE ASSEMBLYSEAT BELTS:FRONT:BUCKLE ASSEMBLY4 February 2003 · NHTSA (USA)

ON CERTAIN PASSENGER VEHICLES, THE CONNECTION OF THE SAFETY BELT BUCKLE TO THE STEEL ROPE OF THE TENSIONER DOES NOT MEET BMW SPECIFICATIONS. IN SEVERE FRONTAL CRASHES, THIS CONNECTION CAN DETACH.

Risk: IF THE CONNECTION DETACHES, THE PROTECTION PROVIDED BY THE SAFETY BELT IS LIKELY TO BE IMPAIRED, AND SERIOUS INJURIES TO THE DRIVER AND/OR FRONT PASSENGER COULD OCCUR THAT MIGHT OTHERWISE BE MITIGATED.

Remedy: DEALERS WILL INSPECT BOTH FRONT SAFETY BELT TENSIONER AND BUCKLE ASSEMBLIES, AND IF NECESSARY, REPLACE THESE PARTS. OWNER NOTIFICATION BEGAN MARCH 19, 2003. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT BMW AT 1-800-831-1117.

We could not check this: model year. The authority's notice

A12/00039/20Safety recallInjuriesno date · EU Safety Gate

The connector of the positive battery cable on the front power distribution box may be damaged over the lifetime of the vehicle by vibrations and currents. This may lead to failure of the engine and of the vehicle's electrical system, including headlights and occupant protection which will increase the risk of an accident and injuries to the occupants.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

We could not check this: model year. The authority's notice

A12/1019/18Safety recallInjuriesno date · EU Safety Gate

The plug connection for the positive battery cable may be defective. This could cause the vehicle electrics and the engine to fail while the vehicle is in motion.

Remedy: Type of economic operator taking notified measure(s): Manufacturer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown

We could not check this: model year. The authority's notice

Engine and transmission

M54B25 · 2.5i

141 kW (192 HP) · petrol

GM5L40 · 5-speed automatic, longitudinal (GM 5L40-E / A5S 360R)

automatic · 5 speed

Torque limit400 Nm
MakerGM

We built the code from the model and the gear count. The factory sheet does not state it.

Variant data

What is in this version

Factory data

Trim
Z4 roadster 2.5i
Body
convertible
Fuel
petrol
Transmission
automatic
Engine size
2494 cc
Power
141 kW (192 HP)
Drive
RWD
Production
2003–2006

Factory service interval

The manufacturer specifies this for this version. Of the mileage and the time, the one that comes first is the one that counts.

  • Air filter

    • 60,000 km or 4 years

  • Cabin (pollen) filter

    • 30,000 km or 2 years

  • Brake fluid change

    • first: 3 years, then 2 years(first change at 3 years, then every two years)

  • Engine oil and oil filter (BMW condition-based service)

    • LongLife25,000 km or 2 years

  • Spark plugs, petrol

    • 60,000 km or 6 years
All E85 versions

Information, not an expert opinion

We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.

  • A fault on the list does not mean the car you are looking at has it.
  • A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
  • You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.
Details in the terms