One of the most alarming indicators on your dashboard is the dreaded check engine light. It’s a signal that puts fear in every vehicle owner that indicates something is not right under the hood. In this month’s blog post, we examine the most common reasons for a check engine light, what to do if you experience this vehicle indicator, and why preventative maintenance is important in mitigating situations that may cause the check engine light to illuminate.
What Does the Check Engine Light Actually Mean?
The check engine light is linked to the onboard diagnostic system (OBD-II), which monitors engine and emissions performance. When a fault is detected, the system triggers the light to alert you. Regardless of the cause, the check engine light should always be addressed immediately to avoid further damage and costly repairs.
Most Common Reasons It Illuminates
- Loose or damaged gas cap: Surprisingly simple—and easily fixed.
- Faulty oxygen sensor: Affects fuel efficiency and emissions.
- Catalytic converter trouble: If untreated, this can lead to engine damage.
- Worn spark plugs or ignition coils: Causes misfires and rough starts.
- Mass airflow sensor issues: Impacts fuel mixture and driving performance.
Red Flag Symptoms
If the light is accompanied by engine knocking, stalling, reduced power, or smoke from the exhaust, that’s your cue to stop driving and seek immediate service. These signs suggest serious engine or emissions system failures that can escalate quickly.
What Should You Do When It Comes On?
First, don’t panic—but don’t ignore it either.
- Check your gas cap—tighten it fully and see if the light goes off after a few drives.
- Look for performance changes—note any odd noises, poor acceleration, or strange smells.
- Visit a trusted service professional or auto parts store – many parts stores offer free diagnostic scans to pinpoint the issue.
- Address issues promptly – early intervention can prevent larger repairs.
Preventive Care
Routine maintenance can keep the check engine light off and your car running smoothly. In Utah’s varying climate, basic services like oil changes, air filter replacements, and timely tune-ups go a long way. Regular inspections help catch minor issues before they trigger warning lights—or worse.
If you have concerns about your vehicle’s engine or the check engine light illuminates, contact the service professionals at Fowers Tire and Auto Care to schedule an appointment.