Probable Causes

• Loose Engine Ground
• Open E1 Circuit
• Open Injector Circuit
• Open Or Short In Oxygen Sensor Or Circuit
• Fuel Line Pressure (Blocked Injector)
• Ignition System
• Coolant Temperature Sensor
• Airflow Meter Or Air Intake System (3S-GTE)
• Vacuum Sensor
• ECU

For oxygen sensor or circuit testing, see Code 21. For injector or circuit testing, see TEST NO. 13.