Fails Emissions Test

SYMPTOM: Fails Emission Test

CHECK
1. Electronic Control Unit (ECU) (**)
2. Fuel Injector (16)
3. Manifold Absolute Pressure Sensor (3) (5)
4. Oxygen Sensor (1) (43)
5. Catalytic Converter
6. Evaporative Emission Controls [Manual Transmission]
7. Positive Crankcase Ventilation [Automatic Transmission]

Numbers in parentheses are the blink codes displayed on back of the ECU.

(**) LED on the ECU is not on, or stays on without blinking. See NOTES ON READING DIAGNOSTIC LIST Article for more information.

For ECU trouble code component testing procedures see Computers and Control Systems.