Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Monitored Emission Control Systems
The OBD-II System monitors all emission control systems that are on-board. The OBD-II regulations require monitoring of the following on this vehicle:
- Catalytic converter efficiency.
- Comprehensive component monitoring - emission related inputs and outputs.
- Evaporative (EVAP) emissions system.
- Fuel delivery system.
- Misfire monitoring.
- Oxygen Sensor (O2S or HO2S) system.
- Oxygen Sensor Heater (HO2S heater) system.
For the specific DTCs required for each system, refer to Inspection/Maintenance System DTC table. See INSPECTION/MAINTENANCE SYSTEM DTCS table under INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE. Systems such as fuel delivery, misfire, and comprehensive components may not be listed in a system status list. These tests run continuously and may not require an indicator.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.