IsItAGoodCar
UK Buyer Reliability Guide3 Known Faults Documented

BMW i4 (G26) Common Problems & Reliability

The BMW i4 is one of the best-driving EVs on the market, brilliantly blending the classic handling of the 4 Series Gran Coupe with a smooth, silent electric powertrain. Positioned as a direct rival to the Tesla Model 3, it appeals to UK company car drivers seeking low tax rates without sacrificing premium build quality or driving dynamics. It is proving to be highly reliable, with excellent real-world range and charging speeds, though early cars can suffer from minor software glitches. It perfectly suits buyers wanting a traditional, sporty BMW driving experience that just happens to be electric.

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3
Generation Periods
3
Known Issues
1
Critical Faults
2
Moderate Issues

Select a Model Year Period

Detailed fault breakdown, symptoms, and estimated repair bills by production year.

20251 issue20242 issues2021–20233 issues

Most Common BMW i4 (G26) Faults & Repair Costs

Moderate Risk

Rear Tyre Wear (M50 / eDrive40)

Est. Cost£250–£500 (per pair)

The heavy weight and instant electric torque result in rapid rear tyre wear, especially on the high-performance M50 model.

Warning Signs:

Low tread depth on inner or center of rear tyres

High Risk

Combined Charging Unit (CCU) High-Voltage Charging Recall

Est. Cost£0 (Recall Campaign) / £1,200–£2,400

Early i4 models were subject to a safety recall regarding the Combined Charging Unit software and power electronics, which could misinterpret voltage spikes and interrupt DC rapid charging.

Warning Signs:

"Charging halted: High-voltage system malfunction" warning, DC fast charging speed capped under 50 kW, Vehicle won't start after charging

Evidence reviewed on

Moderate Risk

Rear Air Suspension Bellow Pressure Loss and Overnight Sag

Est. Cost£350–£800 per side

The standard self-levelling rear air suspension air bags can develop tiny micro-punctures or valve connector seepage, causing the rear end to sag after standing overnight.

Warning Signs:

Rear ride height noticeably low after parking overnight, Air compressor runs loudly for 30+ seconds on startup, "Chassis: continue driving possible" message

Evidence reviewed on

Essential Pre-Purchase Step

Buying a used BMW i4 (G26)? Always check for hidden finance and write-off history.

Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.

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Inspection Checklist for BMW i4 (G26) Buyers

✓Test the curved iDrive display for lag or freezing, and ensure the latest OTA software updates have been applied.
✓Verify the real-world range; the M50 model is incredibly fast but sacrifices significant range compared to the more sensible eDrive40.
✓Inspect the charging port to ensure the locking pin works correctly; a jammed pin will prevent the car from releasing the charging cable.
✓Check the condition of the rear tyres, as the massive instant torque (especially on the M50) wears them out very quickly.
✓Listen for any knocking from the rear air suspension (standard on the i4 to handle the battery weight) over speed bumps.
✓Ensure the artificial 'IconicSounds' generator works correctly when accelerating in Sport mode, though it can be turned off in the menus.