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BMW G29 Z4 common problems
2019–present · sDrive30i, M40i (B46/B48, B58). The known weak spots of the engines used in the G29, with sources, plus the topics that come up most in BMW's service bulletins and NHTSA recalls for this chassis.
Last updated
B46/B48 engine
sDrive30i (2019–present) · B46/B48 bulletins →
Oil filter housing and coolant leaks
The oil filter housing / oil cooler gasket and cooling system leaks are the most common repairs on these modular four-cylinders.
BMW bulletins on file for the G29:
- SIB 11 10 25 Oil filter housing leak Oil filter housing leak on BMW G02/G20/G22/G23 and other models (2025); BMW explains the cause and the approved repair. Service bulletin · Dec 2025
- SIB 11 01 20 Oil filter housing cracking Oil filter housing cracking on BMW G01/G02/G05/G07 and other models (2012–2021); BMW explains the cause and the approved repair. Service bulletin · Jun 2021
- SIB 64 09 21 Air conditioning rattle Air conditioning rattle on BMW G05/G20/G21/G02 and other models (2006–2023); BMW explains the cause and the approved repair. Service bulletin · Sep 2022
B58 / B48 oil filter housing (coolant leak): prices →
Fuel tank vent (purge) valve
BMW extended coverage on the EVAP purge valve to 15 years/150,000 miles on many cars. A failed valve sets check-engine codes and can cause rough idle after refuelling.
BMW bulletins on file for the G29:
- SIB 01 03 24 EVAP system warranty extension EVAP system warranty extension on BMW G01/G02/G05/G06 and other models (2017–2025); BMW extended the warranty on this part for eligible cars. Warranty extension · Jun 2026
B58 engine
M40i (2019–present) · B58 bulletins →
Oil filter housing, valve cover/PCV and coolant leaks
The B58's best-known repairs: oil filter housing gasket leaks, the valve cover with built-in PCV, and coolant leaks from the water pump or expansion tank.
BMW bulletins on file for the G29:
- SIB 11 10 25 Oil filter housing leak Oil filter housing leak on BMW G02/G20/G22/G23 and other models (2025); BMW explains the cause and the approved repair. Service bulletin · Dec 2025
- SIB 11 01 20 Oil filter housing cracking Oil filter housing cracking on BMW G01/G02/G05/G07 and other models (2012–2021); BMW explains the cause and the approved repair. Service bulletin · Jun 2021
- SIB 64 09 21 Air conditioning rattle Air conditioning rattle on BMW G05/G20/G21/G02 and other models (2006–2023); BMW explains the cause and the approved repair. Service bulletin · Sep 2022
B58 / B48 oil filter housing (coolant leak): prices → B58 valve cover / PCV failure: prices → B58 water pump (coolant pump): prices →
Fuel tank vent (purge) valve
Covered by BMW's 15-year/150,000-mile EVAP purge valve extension on many cars.
BMW bulletins on file for the G29:
- SIB 01 03 24 EVAP system warranty extension EVAP system warranty extension on BMW G01/G02/G05/G06 and other models (2017–2025); BMW extended the warranty on this part for eligible cars. Warranty extension · Jun 2026
Most frequent bulletin topics 175 bulletins
| Topic | Bulletins | Examples |
|---|---|---|
| Key fob | 5 | SIB 61 04 21, SIB 61 22 19 |
| Central display | 5 | SIB 65 08 25, SIB 61 05 24 |
| Battery | 4 | SIB 61 03 19, SIB 61 13 05 |
| Seat | 4 | SIB 52 01 20, SIB 52 07 20 |
| Steering squeak | 4 | SIB 32 01 23, SIB 31 02 23 |
| Instrument cluster | 4 | SIB 65 08 20, SIB 62 03 20 |
| Axle | 3 | SIB 31 01 20, SIB 34 03 20 |
| Power window | 3 | SIB 51 13 18, SIB 51 08 19 |
BMW service bulletins and warranty extensions filed with NHTSA that list the G29, grouped by topic. A bulletin tells technicians how to diagnose and fix a known issue; it doesn't mean every car has the problem.
NHTSA recalls by component 12
- integrated transmission control unit · 1 recall23V821
- digital key ECU software coding · 1 recall23V099
- engine management software · 1 recall21V598
- passenger seat safety belt retractor · 1 recall21V554
- fuel tank · 1 recall20V700
- headlamp adjustment plug · 1 recall20V516
- steering gear tie rod · 1 recall20V355
Matched from NHTSA's public recall file by model and model year. Recall repairs are free; check a VIN.
BMW warranty extensions that list the G29
- SIB 01 03 24 EVAP system warranty extension EVAP system warranty extension on BMW G01/G02/G05/G06 and other models (2017–2025); BMW extended the warranty on this part for eligible cars. Warranty extension · Jun 2026
If a car qualifies, the listed repair may be free. Check eligibility for the VIN with a BMW center.
Repair prices for these engines
B58 / B48 oil filter housing (coolant leak) B58 valve cover / PCV failure B58 / B48 fuel tank vent valve (purge valve) B58 coolant expansion tank (G05 X5 40i, high- or low-temp) B58 heat management module (thermostat) replacement B58 oil pump replacement B58 water pump (coolant pump)
Prices on these pages are for other chassis with the same engine.
Sources: BMW service bulletins and recalls filed with NHTSA (public data) and the specialist and owner write-ups linked above. Not affiliated with BMW.