BMW G01 X3 / G02 X4 — Reliability Report

Overview

The G01 X3 (2017-2024) and G02 X4 (2018-present) are among BMW's best-selling models. Generally very reliable.

Engine

B48 (xDrive20i, xDrive30i)

• Coolant loss — thermostat housing
• Otherwise excellent reliability
• No timing chain concerns

B58 (M40i)

• Coolant loss — same thermostat issue
• Charge pipe on tuned cars
• Fantastic engine — powerful and reliable

S58 (X3 M / X4 M)

• Oil consumption on some units
• Charge pipe under increased boost
• Still relatively new — long-term data emerging

B47/B57 Diesel

• DPF with city driving
• AdBlue system faults
• Generally reliable

Chassis

• Rear shock mount noise — some reports
• Run-flat tire harshness
• Air suspension (if equipped) — still a wear item

Electronics

• Software bugs — resolved via OTA updates
• Wireless CarPlay disconnects
• Parking assistant false warnings

Best Buy

B58 M40i is the enthusiast's choice — 382 hp, reliable, tunable. B48 xDrive30i for sensible daily driving.