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2010 MINI COOPER
1.6L I4•FWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor551Torque4624Fluid6DTC898Battery1Maintenance0Recalls2
P1345high severityPowertrain

Misfire Cylinder 1 With Fuel Cut-Off

on 2010 Mini Cooper 1.6L I4 · FWD

What this code means

The DME detected a severe misfire on Cylinder 1 that triggered fuel injector shut-off for that cylinder to protect the catalytic converter. BMW uses cylinder-specific fuel cut-off to prevent unburned fuel from damaging the catalyst.

Symptoms

  • Check Engine Light flashing
  • Rough running
  • Loss of power
  • Exhaust smell of unburned fuel
  • Vibration at idle

Common causes

  • Faulty ignition coil Cylinder 1
  • Worn or fouled spark plug Cylinder 1
  • Faulty fuel injector Cylinder 1
  • Low compression Cylinder 1
  • Vacuum leak at Cylinder 1 intake runner

Diagnostic steps

  1. Read misfire counters for all cylinders
  2. Swap ignition coil from Cylinder 1 to another cylinder and retest
  3. Inspect spark plug Cylinder 1
  4. Test fuel injector Cylinder 1
  5. Perform compression test

Repair notes

Replace faulty ignition coil or spark plug on Cylinder 1.

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Other Powertrain codes on this vehicle

🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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