Manufacturer Code Charts: 140304

140304 - P0303

Information saved in
DME

Fault code
140304 - P0303

Fault text
Misfire, cylinder 3: damaging exhaust gas

Fault description
The diagnostic function monitors the duration of the
combustion strokes and compares them with the remaining
cylinders by assessing the rpm signals (segment periods).

Condition for fault identification
Test condition:
The fault is recognized when the combustion stroke in a
particular cylinder is slower than the combustion strokes on
the other cylinders.
Potential problem source(s):
- Defect in mixture formation
- Defect in ignition system
- Mechanical defect
- Defective DME
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- None
Time condition:
- None
Other conditions:
- Engine ON

Condition for fault memory entry
The diagnostic fault code is logged when a specific number
of combustion miss events, with their negative effects on
exhaust emissions, are recognized within 1000 crankshaft
revolutions.

Action in service
- Because this is a secondary fault, start by repairing the
primary faults

Fault effect and breakdown warning
Breakdown notice:
None
Possible apparent symptoms:
Combustion miss may be noticed.

Driver information
Warning light:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: on
- CC message: on
- US emissions warning lamp: off
- US electronic engine power reduction: off
- CC message: none

Service instruction
None