P1345high severityPowertrain
Misfire Cylinder 1 With Fuel Cut-Off
on 1996 BMW 318i 1.9L I4 M44 · RWD
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
- 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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1