IsItAGoodCar
Reliability Guide

Common Problems with the
2021 BMW i3 (I01)

We've identified 1 known issue that can affect the 2021 BMW i3 (I01). None are considered critical, but they're worth knowing about before you buy.

1
Known Issues
0
Serious
0
Moderate
1
Minor

All Known Issues

12V Auxiliary Battery Failure

MinorElectrics & Electronics

The small 12v battery powers the car's computers. When it fails, the car throws dozens of unrelated error codes and may refuse to engage the high-voltage system.

Est. Repair Cost: £150–£250
Warning Signs:

Random "High Voltage System" errors, Car won't "Ready" or unlock, Screen glitches

What to Inspect:
  • Check the date code on the 12v battery (should be replaced every 4-5 years)
  • If original, budget for immediate replacement
Verified by IsItAGoodCar Research Team

Buying Tips for 2021 BMW i3 (I01)

  • On REx models, ensure the petrol engine starts and runs smoothly; many are never used and can seize or corrode internally
  • Check the custom narrow Bridgestone Ecopia tyres for wear; they are expensive and can wear quickly on the rear
  • Inspect the CFRP door sills and the plastic body panels for any cracks or structural damage
  • Verify the high-voltage battery capacity via the hidden service menu to ensure it hasn't degraded excessively
Check a 2021 BMW i3 (I01) by Registration