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 Codes: Notes
All Honda engines have specific system readiness codes that are part of the on-board diagnostics for the emissions systems. If the vehicle battery has been disconnected or discharged, these codes are erased. In some states where Inspection/Maintenance (I/M) testing of vehicle emissions is performed, these codes must be set. If all the codes are not set, the I/M test cannot be completed.
The Malfunction Indicator Light (MIL) is used to display state of system readiness. To determine if readiness codes are set, turn ignition on, but do not start engine. MIL should come on for 15-20 seconds. If MIL then goes off, readiness test codes are set. If MIL blinks several times, readiness test codes are not set completely. To reset each code, drive vehicle or run engine as described in following procedures.
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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.