BMW 4 Series G22/G23/G26 420i (Cabriolet / Coupe / Sedan)
Model overview
A modern 4 Series with strong driving dynamics and extensive technology. Body style and equipment change the ownership picture.
Pros
- Responsive handling
- Modern cabin
- Refined long-distance driving
Cons
- Complex electronics
- Premium servicing costs
- Expensive larger wheels and tyres
Common problems & ownership concerns
Potential impact: Low · Medium · High. This describes possible consequences, not fault likelihood.
- Electrical and infotainment faultsMedium
- Suspension wearMedium
- Cooling-system leaks on applicable versionsMedium
Maintenance
Follow the exact powertrain schedule and maintain body-specific equipment where fitted.
Engine overview · 2.0L 4-cyl PETROL
This 2.0-litre four-cylinder petrol group covers turbocharged 420i and 430i BMW 4 Series applications, with output, calibration and drivetrain varying by year and VIN.
Pros
- Flexible performance across several 4 Series applications.
- Widely used compact four-cylinder layout.
Cons
- Variant-specific parts and calibrations require VIN confirmation.
- Turbocharging and thermal-management systems add complexity.
Common problems & ownership concerns
Potential impact: Low · Medium · High. This describes possible consequences, not fault likelihood.
- Cooling-system leaksHigh
- Oil leaks or oil consumptionMedium
- Turbocharger and boost-control faultsMedium
- Ignition and fuel-system faultsMedium
Maintenance
Use the VIN-specific service schedule and BMW-approved oil; keep coolant, oil level and software or maintenance actions under review.
These are general ownership concerns, not a diagnosis. Equipment and engine details vary by version and production date.
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