277B - P0304 (DME)

277B - P0304

Information saved in
DME

Fault code
277B - P0304

Fault text
Combustion misfires, cylinder 4

Fault description
Combustion misfires, cylinder 4

Condition for fault identification
Test condition:
580 < nmot < 6500
barometric pressure > 740 hPa
after engine start
Terminal condition: Terminal 15
Voltage condition:
none

Condition for fault memory entry
The initial 1000 post-start crankshaft revolutions

Action in service
1. If any faults or faults related to the mixture, VANOS,
lambda control/oxygen sensor, fuel sensor, camshaft control
or injection valves are present, repair these first.
2. Spark plug: Visual inspection (ceramic cracks, black
electrodes, electrode gap, etc.), replace as indicated.
3. Electrical check on wiring harness, check contacts
(corrosion, damage to insulation).
4. Check ignition coil for corrosion and cracks, replace as
indicated.

Fault effect and breakdown warning
None
Combustion miss may be noticed.

Driver information
Warning light:
MIL ON

Service instruction
None