What causes service engine light to stay on and is setting 3 codes?

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2000 Pontiac Montana Engine Diagram | My Wiring DIagram
2000 Pontiac Montana Engine Diagram | My Wiring DIagram

Pontiac MONTANA Connector, Inline - to F/TNK Harness and Oxygen (O2
Pontiac MONTANA Connector, Inline - to F/TNK Harness and Oxygen (O2

2001 Pontiac Sunfire Fuel Pump Wiring Diagram - Wiring Diagram and
2001 Pontiac Sunfire Fuel Pump Wiring Diagram - Wiring Diagram and

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2002 Pontiac Montana Serpentine Belt Diagram

What causes service engine light to stay on and is setting 3 codes?
What causes service engine light to stay on and is setting 3 codes?

Repair Diagrams for 2008 Pontiac Montana Engine, Transmission, Lighting
Repair Diagrams for 2008 Pontiac Montana Engine, Transmission, Lighting

Wiring Diagram PDF: 2002 Pontiac Montana Wiring Diagram
Wiring Diagram PDF: 2002 Pontiac Montana Wiring Diagram