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 Test Mode
On-Board System Readiness (OSR) test mode indicates OBD-II system operating status by indicating status of each system monitor (complete or incomplete). If any monitor function is incomplete the WDS or scan tool will identify which monitor function has not been completed. Misfires, fuel system and comprehensive components are continuous monitoring-type functions. Catalyst, EGR system, EVAP system and oxygen sensor will be monitored under each drive cycle. OBD-II diagnostic system is initialized by performing the DTC cancellation procedure or disconnecting negative battery cable.
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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.