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Engine Emission Control: Notes

CAUTION: Do not remove any part of the engine emission control system. Operating the engine without the engine emission control system intact will reduce fuel economy and engine ventilation. This will weaken engine performance and shorten engine life.

The engine emission control system consists of the:

Positive crankcase ventilation (PCV) system.
Exhaust gas recirculation (EGR) system.
Secondary air injection (AIR) system (certain 2.0L engines only)