BMW X4 G02
Weaknesses, engine ratings and buying advice
374 PS
M40i · Benzin
M40i coupé-SUV
DecentGenerations
Engine Overview
The BMW X4 G02 is available with 6 engine variants — from 116 to 510 hp.
Modular straight-six diesel with up to 340 hp in the M version. Extremely smooth and torquey; DPF and SCR catalytic converter are the main wear points.
- !! EGR cooler failure from 120,000 km
EGR cooler can fail and allow coolant into the intake tract. Documented cases of engine damage shortly after EGR cooler replacement.
Symptoms: Coolant loss, white smoke, engine check light, overheating - !! Timing chain elongation on early models from 130,000 km
Early B57 models (from about 2015/16) show chain elongation with rattling noises on startup. Timing chain replacement requires engine removal. Repair costs comparable to the N57. Significantly rarer from 2018 models.
Symptoms: Metallic rattling on cold start, especially at low temperatures; subsides after warm-up; in extreme cases engine stumble - !! Turbocharger bearing damage at high mileage from 180,000 km
Bearing damage occurs in the bi-turbo system at higher mileage. Turbine blades can break off and cause engine damage. Frequently encouraged by insufficient oil change intervals.
Symptoms: Whistling or howling under load; blue exhaust smoke; power loss; MIL; in extreme cases sudden power loss from turbo failure
+ 2 more engine weaknesses + vehicle weaknesses
Modular four-cylinder diesel as a direct successor to the N47 — and a significant improvement. The timing chain now sits at the front of the engine (belt side), massively simplifying maintenance and diagnostics. The biggest N47 problem is structurally eliminated. Early examples (2014-2016) still had occasional chain stretch, from 2017 onward this is no longer an issue. The EGR cooler was subject to a BMW recall for potential fire risk — when buying used, always verify the recall was performed. In daily use a very balanced engine: Depending on variant 116 to 190 hp — even the base version is sufficient for relaxed driving, the 8-speed automatic pairing (ZF 8HP) is one of the best combinations in the segment. Real-world consumption 5-6 L/100km, documented mileages beyond 300,000 km. Weak points remain DPF with pure short-distance driving and typical diesel issues (EGR carbon buildup, injector wear from 160,000 km). Overall a solid, mature diesel — not maintenance-free, but in direct N47 comparison a different league.
- !! Timing chain elongation on early models (2014–2016) from 120,000 km
Early B47 engines (2014–2016) are prone to premature chain elongation. The tensioner can no longer compensate. Rattling on cold start is the typical warning sign before chain snap and engine damage.
Symptoms: Metallic rattling or clattering on cold start; subsides after warm-up; in advanced cases audible during driving; MIL may illuminate - !! EGR cooler leak with fire risk (recall) from 100,000 km
Overheating and leaking EGR coolers can vaporise glycol and trigger self-ignition. BMW recalled affected vehicles. If coolant enters the combustion chamber, hydraulic lock and engine damage are possible.
Symptoms: Coolant level drops without visible leak; whitish smoke from exhaust; rough idle; MIL; limp mode; rarely smoke from engine bay - !! Turbo cascade failure from 130,000 km
Turbocharger develops axial play, blocks oil return and causes cascading damage to rod bearings, crankshaft and EGR cooler. Metal shavings circulate through entire oil system.
Symptoms: Power loss, whistling under load, increased oil consumption, blue smoke, rough running
+ 4 more engine weaknesses + vehicle weaknesses
Modular straight-six diesel with up to 340 hp in the M version. Extremely smooth and torquey; DPF and SCR catalytic converter are the main wear points.
- !! EGR cooler failure from 120,000 km
EGR cooler can fail and allow coolant into the intake tract. Documented cases of engine damage shortly after EGR cooler replacement.
Symptoms: Coolant loss, white smoke, engine check light, overheating - !! Timing chain elongation on early models from 130,000 km
Early B57 models (from about 2015/16) show chain elongation with rattling noises on startup. Timing chain replacement requires engine removal. Repair costs comparable to the N57. Significantly rarer from 2018 models.
Symptoms: Metallic rattling on cold start, especially at low temperatures; subsides after warm-up; in extreme cases engine stumble - !! Turbocharger bearing damage at high mileage from 180,000 km
Bearing damage occurs in the bi-turbo system at higher mileage. Turbine blades can break off and cause engine damage. Frequently encouraged by insufficient oil change intervals.
Symptoms: Whistling or howling under load; blue exhaust smoke; power loss; MIL; in extreme cases sudden power loss from turbo failure
+ 2 more engine weaknesses + vehicle weaknesses
Closed-deck aluminium block as standard — a feature normally reserved for racing engines. Water-cooled turbo with mechanical wastegate linkage that rattles at cold start — by design, not dangerous. Barely audible at idle; from 3,000 rpm a rich, deep six-cylinder thrust builds linearly to 6,500. The B58 sounds fuller than the S55 from outside — but inside the motorsport aggression is absent. Dual injection (direct + port) reduces intake valve carbon build-up significantly. The PCV membrane in the valve cover is the known weakness: BMW had to extend the warranty to 15 years. Plastic oil filter housing cracks around 100,000 km — coolant mixes into oil, act immediately. Oil changes every 10,000 km; inspect the cooling system from 70,000 km. Tuning: Stage 2 brings 500 hp — the closed deck makes it possible.
- !! Oil filter disintegrates — engine damage risk from 30,000 km
On B58-equipped M140i/M240i the oil filter can disintegrate on first change and distribute filter material through the oil circuit. BMW covers the costs with proven service history.
Symptoms: Oil pressure warning, metallic noises, engine damage after oil change - !! Plastic oil filter housing cracks — coolant/oil mixing from 100,000 km
The plastic oil filter housing becomes brittle from heat cycling and cracks — often during oil changes from overtightening the filter cap. Coolant and oil mix; engine damage likely if unnoticed.
Symptoms: Milky oil on the filler cap, coolant loss without visible leak, oil pressure warning, coolant level drops slowly - !! PCV valve / valve cover membrane failed from 80,000 km
The PCV membrane in the integrated valve cover tears or hardens from heat cycles. Crankcase builds positive pressure, oil is forced through seals. BMW extended the warranty to 15 years/150,000 miles.
Symptoms: Whistling or squealing from the engine bay, white or blue smoke, rough idle, oil in the charge pipe or air filter
+ 9 more engine weaknesses + vehicle weaknesses
Modular four-cylinder turbo and workhorse of the current BMW lineup. Wide power range from 135 to 306 hp (M135i/M235i). Structurally the best four-cylinder petrol BMW has ever built: timing chain at front, closed oil circuit, Valvetronic variable valve lift. Oil consumption stays under control when BMW-spec oil (LL-01 or LL-17FE+) is used. Typical wear items are the electric water pump (from around 80,000 km) and the high-pressure pump with direct injection. Not an engine to fear — but BMW service intervals are too long; those who care for their B48 change oil every 10,000-12,000 km.
- !! Timing chain guide rail breaks from 60,000 km
Timing chain guide rail can break; chain jump and engine damage follows. More common on early production years and with spirited driving.
Symptoms: Rattling, clattering from the engine, sudden power loss, engine damage - !! Oil filter housing leaking — coolant loss from 60,000 km
Oil filter housing with integrated oil/water heat exchanger leaks. Coolant loss and overheating risk from about 60,000 km.
Symptoms: Coolant level warning, oil puddle under engine, overheating - !! Coolant bleed line at cylinder head breaks from 70,000 km
A plastic bleed line between the cylinder head and expansion tank becomes porous and breaks. Coolant loss follows; the mounting location is difficult to access, so labour costs dominate.
Symptoms: Dropping coolant level; coolant warning on the instrument cluster; faint sweet smell; no visible puddle under the car
+ 6 more engine weaknesses + vehicle weaknesses
Modular four-cylinder turbo and workhorse of the current BMW lineup. Wide power range from 135 to 306 hp (M135i/M235i). Structurally the best four-cylinder petrol BMW has ever built: timing chain at front, closed oil circuit, Valvetronic variable valve lift. Oil consumption stays under control when BMW-spec oil (LL-01 or LL-17FE+) is used. Typical wear items are the electric water pump (from around 80,000 km) and the high-pressure pump with direct injection. Not an engine to fear — but BMW service intervals are too long; those who care for their B48 change oil every 10,000-12,000 km.
- !! Timing chain guide rail breaks from 60,000 km
Timing chain guide rail can break; chain jump and engine damage follows. More common on early production years and with spirited driving.
Symptoms: Rattling, clattering from the engine, sudden power loss, engine damage - !! Oil filter housing leaking — coolant loss from 60,000 km
Oil filter housing with integrated oil/water heat exchanger leaks. Coolant loss and overheating risk from about 60,000 km.
Symptoms: Coolant level warning, oil puddle under engine, overheating - !! Coolant bleed line at cylinder head breaks from 70,000 km
A plastic bleed line between the cylinder head and expansion tank becomes porous and breaks. Coolant loss follows; the mounting location is difficult to access, so labour costs dominate.
Symptoms: Dropping coolant level; coolant warning on the instrument cluster; faint sweet smell; no visible puddle under the car
+ 6 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Recall: Integrated Braking System (IBS) A production defect in the IBS motor position sensor can cause ABS and DSC to fail. Affected vehicles produced June 2022 to August 2024. BMW replaces the integrated braking system free of charge (Recall 0034670200). Symptoms: Warning symbols in the cockpit, increased brake pedal force required, ABS/DSC failure message | Low | |
| Particulate Filter Clogging — Diesel Engines Diesel engines in the G02 are prone to particulate filter clogging when used predominantly for short trips. Regeneration requires longer motorway runs. A blocked DPF can trigger engine protection shutdown. Symptoms: Engine management light, increased fuel consumption, power loss, request to perform a regeneration run from 80,000 km | High |
Top Reported Issues
Alternatives
Audi Q6 J3
Mid-Size SUV (2024–2026)
Audi SQ6 e-tron J3
Mid-Size SUV (2024–2026)
Chevrolet Blazer EV VSS-R
Mid-Size SUV (2024–2026)
Citroën ë-C5 Aircross I
Mid-Size SUV (2024–2026)
Cupra Terramar I
Mid-Size SUV (2024–2026)
Cupra Tavascan I
Mid-Size SUV (2024–2026)
Explore more
Known Problems and Issues +
A total of 47 weaknesses have been documented for the BMW X4 G02 (2018–2026) — 42 engine-related and 5 vehicle-related. Typical issues affect Other, Electronics, Gearbox, Suspension.
X4 (B47D20, 2018–2026) — Be Careful: Timing chain elongation on early models (2014–2016), EGR cooler leak with fire risk (recall), Turbo cascade failure. Power: 190 PS.
X4 (B57D30, 2018–2026) — Be Careful: EGR cooler failure, Timing chain elongation on early models, Turbocharger bearing damage at high mileage. Power: 258–265 PS.
X4 (B57D30, 2018–2026) — Be Careful: EGR cooler failure, Timing chain elongation on early models, Turbocharger bearing damage at high mileage. Power: 340 PS.
X4 (B48B20, 2018–2026) — Be Careful: Timing chain guide rail breaks, Oil filter housing leaking — coolant loss, Coolant bleed line at cylinder head breaks. Power: 184 PS.
X4 (B48B20, 2018–2026) — Be Careful: Timing chain guide rail breaks, Oil filter housing leaking — coolant loss, Coolant bleed line at cylinder head breaks. Power: 245–252 PS.
X4 (B58B30, 2018–2026) — Be Careful: Oil filter disintegrates — engine damage risk, Plastic oil filter housing cracks — coolant/oil mixing, PCV valve / valve cover membrane failed. Power: 374 PS.
X4 M (S58B30, 2019–2026) — Be Careful: Oil cooler leaking from stone impact, Connecting rod bearing wear with tuning, Main bearing shells recall (manufacturing defect 2021). Power: 480 PS.
X4 M (S58B30, 2019–2026) — Be Careful: Oil cooler leaking from stone impact, Connecting rod bearing wear with tuning, Main bearing shells recall (manufacturing defect 2021). Power: 510 PS.
What to watch out for with the BMW X4? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the BMW X4 G02 have? +
What should I look for when buying a used BMW X4 G02? +
Which engine is recommended? +
Which BMW X4 G02 engine is the most fun? +
Is the BMW X4 G02 worth buying used? +
What horsepower variants are available for the BMW X4 G02? +
Last updated: February 2026 · All information without guarantee