Probable Causes

*  Loose Engine Ground Bolt

*  Open E1 Circuit

*  Open in Injector Circuit Or Injector

*  Fuel Pressure (Blocked Injector)

*  Open Or Short In Oxygen Sensor Or Sensor Circuit

*  Ignition System

*  Coolant Temperature Sensor

*  Vacuum Sensor

*  ECU

For oxygen sensor and circuit testing, see Code 21. For injector or circuit testing, see TEST NO . 12.