Fails Emission Test

Check in the Order Listed:

1. Emission Control System
a. Evaporative Emission Controls
b. Catalytic Converter
2. Manifold Absolute Pressure (MAP) Sensor (code 3,5)
3. Fuel Supply System
a. Pressure Regulator
b. Fuel Injector
c. Injector Resistor
4. Heated Oxygen Sensor or Non-heated Oxygen Sensor (code 1,41,43,48)
5. Idle Control System
a. Hoses and Connections
6. Engine Control Modules (ECM) (BU)

NOTE:
(BU) code used when the MALFUNCTION INDICATOR WARNING LAMP is on, and the self-diagnosis indicator LED is ON with no "blinks", the back-up system is in operation.

Self-diagnosis indicator, (LED) blinks (?), will follow associated systems.