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.
On-Board System Readiness (OSR) Test Mode
All OBD-II scan tools must display OSR test. OSR will display monitors on vehicle and status of all monitors, complete or not complete. If not complete, scan tool will display which monitors are not complete. To enter OSR, turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps:
- Select vehicle and engine selection menu (optional).
- Select year, engine, model and any additional information requested by scan tool.
- Follow operating instructions from scan tool menu.
- Select GENERIC OBD-II FUNCTIONS. Press TEST button if monitors are not complete.
- Select ON-BOARD SYSTEM READINESS.
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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.