EXPERT IN AUTO PARTS
24 November 2025 (updated) Table of Contents
The electric tailgate of the BMW X4 shows frequent defects that manifest themselves through various symptoms. The system does not function correctly if the sensors are dirty or defective, which occurs particularly in the G02 models with a mileage of 30,000 kilometres or more. The tailgate does not start or only opens partially, which indicates problems with the gas struts or the electric motor. In F26 models, these complaints often occur after 25,000 km, while newer G02 variants are usually only affected after 40,000-50,000 km. The reliability of the mechanism suffers under extreme temperatures and frequent use. Typical failures include complete failure of the opening function or incomplete closing, which poses safety risks.
Regular maintenance is essential for the tailgate to function properly. The sensitive BMW X4 tailgate sensors require regular cleaning and calibration to avoid false alarms. Replacing the gas struts every 80,000-100,000 km and lubricating the hinges every 20,000 km can significantly extend their service life. At the first symptoms such as slow opening or unusual noises, a diagnosis should be carried out to prevent major damage to the electric motor or the control unit.
The powerful M40i and M40d variants of the BMW X4 have specific turbocharger weaknesses that affect reliability. In M40i models, the first problems typically occur after 80,000-100,000 km, while M40d variants often develop symptoms after 70,000-90,000 km. The turbocharger does not function optimally when the bearings wear out or the seals start to leak. Common complaints include reduced boost pressure, increased oil consumption and metallic noises from the engine compartment. The service life of the turbocharger is shortened by aggressive driving and inadequate maintenance. Breakdowns are often manifested by a sudden loss of power or bluish smoke from the exhaust. In M40d models, problems with the variable turbine geometry system can also occur, resulting in uneven power delivery.
A systematic check is crucial for the early detection of turbocharger problems. The highly stressed BMW X4 M40i and M40d turbochargers require oil changes every 10,000 km with high-quality engine oil of the BMW Longlife-04 specification. After every high-speed drive, a cool-down phase of 2-3 minutes should be observed to avoid heat damage. Regular checks of the boost pressure and exhaust gas temperatures can indicate wear at an early stage and prevent costly repairs.
Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC
-39%
RIDEX Tyre pressure sensor (TPMS)
with groove, with valves
Article number: 2232W0084
compared to
RRP
£43.80
£26.49£105.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
-27%
Article number: 5011987001831
More
compared to
RRP
£22.73
£16.49
£16.49
for 1 litre
price incl. 20% VAT, excl. delivery costs
SKF Bellow Set, drive shaft
146 mm, with clamps
Article number: VKJP 01001
£9.99£19.98 / Price per 2 items
price incl. 20% VAT, excl. delivery costs
-53%
ZF GETRIEBE Automatic transmission fluid
ATF 8HP, 1l, green
Article number: S671.090.312
More
compared to
RRP
£47.78
£21.99
£21.99
for 1 litre
price incl. 20% VAT, excl. delivery costs
Article number: MN8207-4
More
£22.49
£5.62
for 1 litre
price incl. 20% VAT, excl. delivery costs
The diesel particulate filter in the 20d and 30d variants of the BMW X4 develops characteristic weak points that occur particularly on short journeys. The system does not function properly if the filter becomes clogged due to incomplete regeneration cycles. In 20d models, the first problems typically occur after 60,000-80,000 km, while 30d variants are often affected after 50,000-70,000 km. The most common symptoms include warning lights on the dashboard, reduced engine performance and increased fuel consumption. The filter does not automatically switch to regeneration mode when driving mainly in town. Faults are manifested by black smoke when accelerating or an engine that will not start in extreme cases. The service life of the DPF is significantly influenced by the driving style, with regular motorway driving extending the service life.
Professional maintenance is required to prevent and rectify DPF problems. The BMW X4 20d and 30d diesel particulate filters require regular long distance driving at a minimum of 60 km/h for 20-30 minutes every 500-800 km to allow full regeneration. At the first sign of clogging, a professional DPF cleaning for 300-500 euros can restore the function. Preventive measures include the use of high-quality diesel fuel and regular additive treatments every 10,000 km.
The automatic transmission of the BMW X4 shows specific defects in both the F26 and G02 generations, which manifest themselves in characteristic symptoms. The transmission does not shift smoothly and develops jerkiness when starting off or changing gear, which typically occurs after 70,000-90,000 kilometres. In F26 models, the problems often manifest themselves in delayed response to accelerator pedal changes and hard gear changes. G02 variants often exhibit problems with the adaptive shift logic, whereby the system does not function optimally in changing driving conditions. Common complaints include vibrations at idle, unusual noises from the transmission and, in rare cases, complete transmission failure. Reliability is affected by aggressive driving and irregular maintenance. Breakdowns can manifest themselves through emergency running programmes or the engine no longer starting.
A professional inspection is essential to diagnose and rectify transmission problems. The complex BMW X4 F26 and G02 automatic transmissions require oil changes every 60,000-80,000 km with BMW-specific ATF oil and regular software updates of the transmission control unit. At the first sign of shifting problems, a diagnosis should be carried out using BMW-specific diagnostic equipment to read out error codes and check the adaptation values. Preventive maintenance can extend the service life to over 200,000 km.
The high-pressure pump of the diesel engines in the BMW X4 develops specific weak points, which occur particularly in 20d, 30d and M40d variants. The system does not function correctly when the internal components wear out or the fuel quality is inadequate. The first symptoms typically appear after 100,000-150,000 km and manifest themselves as uneven engine running, loss of power and metallic noises from the engine compartment. The pump will not start properly if the electrical supply is faulty or the control valves are defective. In M40d models, problems can occur after 80,000 kilometres due to the higher load. Common complaints include starting problems, especially in cold temperatures, and jerking at low revs. Reliability is negatively affected by poor quality fuel and long idle times. Breakdowns can lead to complete engine failure if metal shavings get into the fuel system.
Regular maintenance is crucial for the longevity of the high-pressure pump. The precise BMW X4 diesel engine high-pressure pumps require high-quality fuel with a low sulphur content and regular fuel filter changes every 40,000-60,000 km. The use of fuel additives every 10,000 km can prevent deposits and improve lubrication. At the first sign of problems, the fuel pressure should be measured and the fuel injectors checked to avoid expensive consequential damage.
Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC
-18%
Article number: 15F7E5
More
compared to
RRP
£50.65
£41.49
£10.37
for 1 litre
price incl. 20% VAT, excl. delivery costs
FEBI BILSTEIN Fuel cap
not lockable, Plastic, black, with support strap
Article number: 45549
£17.49price incl. 20% VAT, excl. delivery costs
FEBI BILSTEIN Antifreeze
G11, blue, 5l, Concentrate
Article number: 22268
More
£21.99
£4.40
for 1 litre
price incl. 20% VAT, excl. delivery costs
-27%
LIQUI MOLY Engine oil
5W-30, 5l, Synthetic Oil
Article number: 3756
compared to
RRP
£73.77
£53.49
£10.70
for 1 litre
price incl. 20% VAT, excl. delivery costs
Article number: 83210398507
£19.49
£19.49
for 1 litre
price incl. 20% VAT, excl. delivery costs
Based on the experience of BMW X4 owners, the following additional problems occur:
| Strengths | Weak points |
|---|---|
| Sporty driving performance | Tailgate mechanism defects |
| High-quality workmanship | Turbocharger problems with M40i/M40d |
| Modern infotainment systems | DPF clogging with diesels |
| Good road holding | Automatic transmission judder |
| Comprehensive safety package | High-pressure pump wear |
| Strong engine range | High maintenance costs |
| Attractive coupé design | Complex electronics |
The BMW X4 proves to be a powerful and well-equipped vehicle, but with specific maintenance requirements. Most problems can be avoided or rectified at an early stage with regular inspections and qualified maintenance. The powerful M40i and M40d variants in particular require attentive care to ensure the longevity of the complex systems.
FEBI BILSTEIN Sensor, exhaust pressure
before soot particulate filter
Sold by AUTODOC
MOBIL Engine oil
5W-40, 5l
Sold by AUTODOC
BOSCH Xenon bulb
D1S, 85V, 35W, 4300K
Sold by AUTODOC
DAYCO Timing chain kit
Sold by AUTODOC
CONTITECH V-Ribbed Belt Set
Sold by AUTODOC
FEBI BILSTEIN Repair Set, harness
with squeeze connector
Sold by AUTODOC
TYC Licence Plate Light
LED, both sides, with LED
Sold by AUTODOC
MOTUL Engine oil
5W-30, 4l
Sold by AUTODOC
FA1 Exhaust clamp
Sold by AUTODOC
CASTROL Automatic transmission fluid
1l, red
Sold by AUTODOC