BMW X4 X4 xDrive20d Executive common faults.

2014–2018, SUV, diesel, 190 HP.

The fault list covers: B47D20 engine, GS6 transmission.

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5 fault write-ups. All are important. 10 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

critical4

Diesel high pressure pump: power loss and engine shutdown while driving

critical

The high pressure pump of these common rail diesels (Bosch CP4) can fail while driving. The characteristic course is not gradual: a "Drivetrain fault" message appears on the dash, and within a few seconds the power is gone, on the motorway too. Afterwards the engine often cranks but will not start.

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What makes the repair expensive: once the inside of the pump wears, metal debris travels through the rail and contaminates the entire fuel system. At that point replacing the pump is not enough: the injectors, the rails, the tank and the lines go with it. That is the difference between a "pump replacement" and a "full system replacement" quote, that is what you should ask about.

The maker started a recall for this in the United States (NHTSA 21V586000, 2014 to 2018 328d / X5 xDrive35d / 535d / 740Ld / X3 xDrive28d). The same campaign did not run in Europe, even though the same pump works in the 320d/520d/X3 20d versions that are common right across Europe. The recall does not cover these cars.

between 79,000 and 248,000 km

What to check

Ask whether there has ever been a "Drivetrain fault" message or a loss of power while driving
Ask for the service history: if the high pressure pump was replaced, check whether the injectors and the lines were replaced with it. If not, the debris may still be in the system
After a cold start listen to the engine at idle: irregular running or smoke is suspect

3 more steps in the write-up

Diesel EGR cooler: cracking, coolant in the intake, fire risk

critical

The internal fins of the exhaust gas recirculation cooler crack over time, and glycol coolant leaks into the intake, where it mixes with soot. The sticky mixture can ignite at high temperature: it can melt the plastic intake manifold and, in extreme cases, cause an engine bay fire.

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The maker recalled the 2013 to 2018 four and six cylinder diesels, roughly 800,000 cars worldwide. The first repair attempt proved insufficient, and the leak returned in several cases: the cooler fitted since 2022, from a different supplier, is the valid fix.

So "the recall was carried out" is not enough on its own: you have to check when, and which repair was done. A first round repair does not by itself rule the problem out.

The early symptoms are white, sweet smelling exhaust smoke, slowly dropping coolant, and a rough idle.

It shows up on diesels built between 2013 and 2018. The earlier M57 is not covered by the recall.

between 108,000 and 222,000 km

What to check

Check the level in the expansion tank, and ask whether it has needed topping up
After a cold start watch the exhaust: persistent white smoke and a sweet smell mean the coolant is burning
Ask for the service book and find the EGR cooler recall entry: Check the date too

2 more steps in the write-up

B47 diesel: the timing chain stretches on the early model years

critical

On the early model years the timing chain of the B47 stretches faster than intended. The chain tensioner compensates for the stretch for a while and then no longer can: the chain jumps, the valve timing goes off, and in a severe case engine damage follows. The first sign is a rattling, clacking noise on a cold start that goes quiet after one to three seconds. On the B47 the chain sits at the front of the engine, not at the rear as on its predecessor, the N47. The replacement is therefore considerably less, between 1,200 and 1,800 euro, against 2,000 to 2,500 euro on the N47; if the chain has already jumped, the repair can run up to 4,500 euro. The risk is highest on units built before the end of 2015, with a reported rate of 3 to 5 per cent. 2016 was better but cases remained, and between July and December 2016 an improved chain tensioner was phased in. After mid-2016 the problem is rare, below one per cent. The engine has been in almost every four-cylinder diesel BMW since 2014, from the 1 Series to the 5 Series and from the X1 to the X4. The build date therefore says more here than the model.

above 120,000 km1,200–4,500 EUR

What to check

Start the engine cold and listen for the rattling noise in the first seconds
Ask for the build date, because units built before the end of 2015 are the risky ones
Ask whether the chain or the tensioner has been replaced, and ask for the invoice

2 more steps in the write-up

B47 / B57 diesel: particulate filter and turbo on short trips

critical

The B47 replaced the N47, and the maker fixed the timing chain problem. The two remaining risks on this modern diesel depend on how the car was used.

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The first is the particulate filter. On short urban trips the regeneration cannot finish, and the filter clogs. The second is the turbo. With extended oil change intervals its bearings wear.

On this engine the service history and the type of use tell you more than the odometer. On a 200,000 km car driven on motorways and serviced often, the filter and the turbo can be in better shape than on a 90,000 km city-only car.

Where turbo wear leads in the worst case: a runaway engine. If the turbo shaft seal fails, engine oil enters the intake on the compressor side. A diesel burns that too, and this is different from a petrol engine: a diesel controls torque with the quantity of fuel injected, and it has no throttle. Once the engine runs on its own oil, cutting the injection and switching off the ignition will not stop it. The revs climb on their own until the engine destroys itself for lack of lubrication.

If this happens while driving, turning the key does not help. The only thing that works is cutting off the air: cover or plug the intake, or discharge a dry powder extinguisher into the intake tract. On a manual car you can also stall it: hold the parking brake and the brake pedal, select a high gear, and release the clutch quickly so the drivetrain chokes the engine.

This is not common, and it can happen on any turbo diesel, not only on this engine. On this engine the turbo bearing and seal wear. The warning signs are blue smoke under acceleration, an unexplained drop in oil level, and an oily charge air pipe.

What to check

Ask how the car was used: short daily trips or longer runs?
Read the fault codes for particulate filter regeneration and differential pressure
On a longer test drive watch the power delivery and the smoke under load

5 more steps in the write-up

expensive1

XDrive transfer case (ATC): binding in corners, plastic actuator gear

expensive

The heart of the four wheel drive in the longitudinal engine BMW X models (X3, X5 and the X1 E84) is the ATC transfer case. It has two faults, and you can feel both while driving.

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The first is wear of the clutch pack and the fluid: in a slow, tight corner (a car park, a roundabout) the car jerks and "hops", as if the drive grabbed and let go. You can also get a jerk when pulling away on a slope. The second is the plastic actuator gear: the position signal is lost, the brake, ABS and 4x4/DSC lights come on together on the dash, and a clicking is audible from the transfer case when you switch the ignition off.

Workshops often propose a full transfer case replacement straight away. But the plastic gear can be replaced on its own, and the wrong tyre size or a mixed set of tyres also imitates the jerking, because the transfer case then slips continuously. So clear up the tyres and the fault code first, before you pay for a transfer case replacement.

between 72,000 and 175,000 km

What to check

In a slow, tight corner (a car park) watch for jerking, binding and a "skipping" feel
When pulling away on light throttle, can you feel the drivetrain jerk
Watch the dash: 4x4, ABS, DSC and brake lights together point at the actuator

4 more steps in the write-up

Official recall10 recallsShow

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

Most recent: 30 March 2023

A12/00868/23Safety recallInjuries30 March 2023 · EU Safety Gate

The airbag may deteriorate over time, and if deployed, excessive internal pressure may cause the inflator body to burst and metal fragments could pass through the cushion material causing injury to occupants. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.

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: 30/03/2023

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

16V333000CHILD SEAT:LATCH STRAPCHILD SEAT:LATCH STRAP23 May 2016 · NHTSA (USA)

BMW of North America, LLC (BMW) is recalling certain model year 2011-2017, X3 sDrive28i, X3 xDrive28i and X3 xDrive35i, vehicles manufactured July 2, 2010 to April 14, 2016, 2015-2017 X3 xDrive28d vehicles manufactured March 10, 2014 to March 31, 2016, and 2015-2017 x4 xDrive28i, X4 xDrive35i and X4 xDriveM40i vehicles manufactured March3, 2014 to April 15, 2016. The affected vehicles have lower anchor bars for securing child restraint seats that may become damaged when using the European-ISOFIX-type, rigid-style connector, child restraint system.

Risk: Damaged lower anchor bars may increase the child's risk of injury in the event of a crash.

Remedy: BMW will notify owners, and dealers will weld a reinforcing bracket to the lower anchor bars and the vehicle body, free of charge. The recall began on July 13, 2016. Owners may contact BMW customer service at 1-800-525-7417.

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

14V648000VISIBILITY:REARVIEW MIRRORS/DEVICES:EXTERIORVISIBILITY:REARVIEW MIRRORS/DEVICES:EXTERIOR16 October 2014 · NHTSA (USA)

BMW of North America, LLC (BMW) is recalling certain model year 2015 X3 and X4 Sports Activity Vehicles manufactured July 28, 2014 to July 29, 2014. The affected vehicles may have been produced with a driver's side exterior rearview mirror that was designed to meet non-US market requirements. Thus, these vehicles fail to comply with the Federal Motor Vehicle Safety Standards No. 111, "Rearview Mirrors."

Risk: The driver may not notice that vehicles viewed in the mirror are closer than they appear, increasing the risk of a crash.

Remedy: BMW will notify owners, and dealers will replace the driver's side exterior rearview mirror, free of charge. The recall began on December 16, 2014. Owners may contact BMW customer service at 1-800-525-7417 or CustomerRelations@bmwusa.com.

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

A12/00608/20Safety recallInjuriesno date · EU Safety Gate

The screw connection from the passenger's airbag to the instrument panel may not have been manufactured according to specifications. As a result, if the airbag is activated, the panel cover may break into pieces, which will be propelled against the passenger increasing the risk of injury.