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.
System Readiness Test (SRT): Description
System Readiness Test (SRT) codes indicate whether self-diagnostic tests for non-continuously monitored components have been completed or are incomplete. Inspection/Maintenance (I/M) tests of the On-Board Diagnostic II (OBD-II) type emission systems may become the legal requirements in some states/areas. All SRT codes must be set, or complete, prior to performing an I/M test. See SETTING SRT CODES procedure.
If diagnostic information is erased or battery is disconnected for a prolonged period of time, vehicle must be driven in the manner prescribed to set all SRT codes. SRT codes are set after component self-diagnosis has been performed one or more times. SRT codes are set whether component diagnosis is good or bad, and whether or not diagnosis is performed in consecutive trips. See SETTING SRT CODES .
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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.
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