Decode and Prioritize Check Engine Light Alerts

Cost Savings

Checklist Tasks

• Scan OBD-II port to retrieve the error code before taking any action.
• Compare code with your manual to separate urgent and minor engine faults.
• Note if the check engine light flashes or is steady to prioritize urgency.
• Inspect gas cap for damage or looseness to rule out easy fixes.
• Review last fueling for poor-quality or contaminated gas as possible cause.
• Look for other warning lights to detect possible electrical system issues.
• Assess engine performance for rough idle, hesitation, or new noises.
• Test battery voltage and alternator to rule out low-voltage false codes.
• Check for wiring or rodent damage under the hood that could cause faults.
• Document temperature and weather conditions at the time of warning.
• List recent DIY repairs or aftermarket parts added before the alert.
• Track how often and when the light appears for intermittent issues.