Fails Emissions Test

SYMPTOM: Fails emissions test

CHECK:
1. Oxygen Sensor (1)(2)
2. Manifold Absolute Pressure Sensor (3)(5)
3. Atmospheric Pressure Sensor (13)
4. Electronic Control Unit *

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

* LED on the ECU is not on, or stays on without blinking.