2016 — 2018
125kW Electric Motor with 647cc Range Extender (REX) - Mid-Life Update REX
Electric/Petrol
Listen carefully for any clicking or metallic rattling from the rear while cornering, as the i3’s range extender motor mounts can occasionally show signs of wear in older examples.
Check the operation of the REX (Range Extender) by ensuring the battery level is below 75% and triggering the 'Range Extender' menu option; the engine should start smoothly without excessive vibration or warning lights.
Inspect the front boot area and the charging port door for any signs of water ingress or loose seals, as debris can sometimes build up in these gaps over time in our NZ climate.
Observe the infotainment screen during a longer drive to ensure it remains stable, as the BMW iDrive units in this generation can occasionally exhibit software glitches after years of daily use.
Consider a full cooling system health check and inspection of the REX drive belt.
Recommended interval for a thorough suspension geometry check and brake fluid flush.
Optimal time to have the high-voltage battery health (SoH) data read by a specialist to understand its current capacity relative to new.
Ensure the REX engine receives its annual oil and filter service, even if you rarely use the petrol motor.
Keep the charging cables clean and stored dry to prevent corrosion of the pins.
Regularly clear the drain holes near the windshield and frunk area to prevent water pooling.
Check tyre tread wear patterns frequently; the i3 uses narrow, unique tyres that can wear differently than standard passenger vehicles.
Keep the BMW software updated if possible to ensure the battery management system runs at its most efficient.
Estimated repair costs if issues arise
Future Budget Planning: While the REX is reliable, it requires periodic maintenance to keep the petrol unit running happily. If the drive belt or servicing intervals are neglected, you might eventually need to budget for a professional service to ensure longevity.
Future Budget Planning: The i3 uses specific, narrow-profile tyres that are unique to this model. Depending on your driving style, you might eventually need to budget for a set of quality replacements to maintain the car's efficiency and handling characteristics.
Future Budget Planning: Like many European vehicles of this age, the suspension components may show signs of wear over time. If you notice a firmer ride or slight knocking over bumps, it is common to consider replacing bushings to restore the factory ride quality.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer