Probable Causes

• Loose Engine Ground
• Open E1 Circuit
• Short In Injector Circuit Or Injector
• Open Or Short In Oxygen Sensor Or Circuit
• Fuel Line Pressure (Leaking Injector)
• Open Or Short In Cold Start Injector Or Circuit
• Airflow Meter Or Air Intake System (3S-GTE)
• Compression Pressure
• Coolant Temperature Sensor
• Vacuum Sensor Circuit
• ECM

For oxygen sensor or circuit testing, see Code 21. For injector or circuit testing, see CELICA TEST 13.