2017 BMW 420i
2017 BMW 420i
Overview
The 2017 BMW 420i, part of the F32/F36 generation, is generally regarded as a reliable vehicle, particularly given its premium segment positioning. It typically features a potent yet efficient turbocharged four-cylinder engine paired with either a manual or automatic transmission. Owners often praise its driving dynamics and build quality. However, like any complex machine, certain areas can experience issues over time. This analysis focuses on documented, non-wear-and-tear related reliability concerns across key systems, providing insights for potential owners and current drivers.
Engine
2.0L B48 Turbocharged Inline-4
PCV Valve Failure
- Symptoms: Rough idle, increased oil consumption, potential stalling, check engine light.
- Solution: Replacement of the Positive Crankcase Ventilation (PCV) valve assembly.
- Cost: $300 - $600
Turbocharger Issues
- Symptoms: Loss of power, whistling noises, blue smoke from exhaust, increased oil consumption.
- Solution: Repair or replacement of the turbocharger unit.
- Cost: $1500 - $3000
Transmission
8-Speed ZF Automatic (8HP)
No widespread issues reported.
- Symptoms: No widespread issues reported.
- Solution: No widespread issues reported.
- Cost: No widespread issues reported.
6-Speed Manual
No widespread issues reported.
- Symptoms: No widespread issues reported.
- Solution: No widespread issues reported.
- Cost: No widespread issues reported.
Suspension
Standard Chassis
No widespread issues reported.
- Symptoms: No widespread issues reported.
- Solution: No widespread issues reported.
- Cost: No widespread issues reported.
Electrical
General Electrical System
Water Pump Failure
- Symptoms: Coolant leaks, engine overheating, check engine light, coolant smell.
- Solution: Replacement of the electric water pump and thermostat assembly.
- Cost: $700 - $1200
Battery Drain
- Symptoms: Difficulty starting, electrical components malfunctioning intermittently, battery warning light.
- Solution: Diagnosis and repair of parasitic draw or replacement of the battery.
- Cost: $200 - $800
Exterior
Body Panels and Trim
No widespread issues reported.
- Symptoms: No widespread issues reported.
- Solution: No widespread issues reported.
- Cost: No widespread issues reported.
Interior
Cabin Electronics and Trim
No widespread issues reported.
- Symptoms: No widespread issues reported.
- Solution: No widespread issues reported.
- Cost: No widespread issues reported.
Summary Verdict
The 2017 BMW 420i demonstrates good overall reliability, with its powertrain and chassis generally performing well. The most commonly cited non-wear-and-tear issues revolve around the engine’s PCV system and turbocharger, and the electric water pump. Electrical gremlins, such as battery drain, can also occur. While these issues are not universal, they represent potential areas of concern that owners should be aware of. Regular maintenance and prompt attention to any warning signs are crucial for maintaining the vehicle’s long-term dependability and avoiding more costly repairs.