Probable Causes:

• Loose Engine Ground Bolt
• Open E1 Circuit
• Open Injector Circuit
• Fuel Line Pressure (Blocked Injector)
• Open Or Short In Oxygen Sensor Or Circuit
• Ignition System
• Coolant Temperature Sensor
• Vacuum Sensor
• EGR System
• ECU

For oxygen sensor or circuit testing, see Code 21.

For injector or circuit testing, see TEST NO. 12.