Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
4-50 Powertrain DTC Charts and Descriptions
Diagnostic Trouble Code (DTC) Charts and Descriptions
P0300 - Random Misfire Detected (Continued)
Possible Causes: • Damaged camshaft position (CMP) sensor
• Low fuel (less than 1/8 tank)
• Stuck open exhaust gas recirculation (EGR) valve
• Restricted EGR passages
• Misfire monitor neutral profile correction has not been relearned since the last mechanical repair
Diagnostic Aids: One or more EGR passages may be restricted.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HD.
P0301 - Cylinder 1 Misfire Detected
Description: This DTC sets when the misfire detection monitor detects an engine misfire in cylinder 1.
Possible Causes: • Ignition system
• Fuel injector 1
• Running out of fuel
• EVAP purge valve
• Fuel pressure
• Evaporative emission system
• Exhaust gas recirculation (EGR) system
• Base engine
• Misfire monitor neutral profile correction has not been relearned since the last mechanical repair
Diagnostic Aids: Misfire is defined as lack of combustion in a cylinder due to absence of spark, incorrect fuel metering, low
compression, or any other cause. The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough to cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HD.
P0302 - Cylinder 2 Misfire Detected
Description: This DTC sets when the misfire detection monitor detects an engine misfire in cylinder 2.
Possible Causes: • Ignition system
• Fuel injector 2
• Running out of fuel
• EVAP purge valve
• Fuel pressure
• Evaporative emission system
• Exhaust gas recirculation (EGR) system
• Base engine
• Misfire monitor neutral profile correction has not been relearned since the last mechanical repair
Diagnostic Aids: Misfire is defined as lack of combustion in a cylinder due to absence of spark, incorrect fuel metering, low
compression, or any other cause. The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough to cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HD.
P0303 - Cylinder 3 Misfire Detected
Description: This DTC sets when the misfire detection monitor detects an engine misfire in cylinder 3.
Possible Causes: • Ignition system
• Fuel injector 3
• Running out of fuel
• EVAP purge valve
• Fuel pressure
• Evaporative emission system
• Exhaust gas recirculation (EGR) system
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.