Misfire Cylinder 1 With Fuel Cut-Off
2001-2003 BMW 525iT E39 2.5L I6 🇨🇦
Description
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
- Read misfire counters for all cylinders
- Swap ignition coil from Cylinder 1 to another cylinder and retest
- Inspect spark plug Cylinder 1
- Test fuel injector Cylinder 1
- Perform compression test
Repair Notes
Replace faulty ignition coil or spark plug on Cylinder 1.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1345 on Other Vehicles
Common Questions
What does code P1345 mean on a 2001-2003 BMW 525iT E39?
P1345 stands for "Misfire Cylinder 1 With Fuel Cut-Off". 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.
What are the symptoms of P1345 on a BMW 525iT E39?
Common symptoms of P1345 include: Check Engine Light flashing, Rough running, Loss of power, Exhaust smell of unburned fuel, Vibration at idle.
What causes P1345 on a 2001-2003 BMW 525iT E39?
Common causes of P1345 include: 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.