What Causes Check Engine Light On
Trusted diagnosis since 1990
Don't ignore your check engine light. We diagnose and repair engine issues.
The check engine light is your vehicle's way of telling you something needs attention. At Scott's Auto and Clutch, we have professional diagnostic equipment to read the trouble codes stored in your vehicle's computer and pinpoint the exact issue. The light can indicate anything from a loose gas cap to serious engine problems. Utah's elevation changes and temperature extremes can trigger emissions-related codes that are common in the Salt Lake Valley.
From Inspection to Repair
From diagnosis to repair, we keep you informed every step of the way.
Describe Symptoms
Call or text us to describe what you're experiencing with your vehicle.
Free Diagnosis
Bring your vehicle in and our technicians will perform a thorough inspection.
Detailed Quote
We explain what we found and provide a clear, upfront quote before any work begins.
Expert Repair
Our experienced technicians complete the repair using quality parts and proven techniques.
Quality Check
We test drive and verify the repair is complete before returning your vehicle.
Why Check Engine Light On Happens
These are the most common reasons drivers experience this symptom. A professional inspection can determine the exact issue with your vehicle.
Loose or Damaged Gas Cap
A loose gas cap triggers an evaporative emissions code. Check that your gas cap clicks when tightened—if the light stays on, there may be a leak elsewhere.
Oxygen Sensor Failure
O2 sensors monitor exhaust gases. Failed sensors cause poor fuel economy and can trigger catalytic converter codes over time.
Catalytic Converter Issues
A failing catalytic converter triggers efficiency codes. This can be caused by the converter itself or by upstream problems like misfires.
Mass Airflow Sensor Problems
The MAF sensor measures air entering the engine. Contamination or failure causes poor performance and fuel economy.
Ignition System Issues
Worn spark plugs, failing coils, or ignition problems cause misfires that trigger the check engine light.
Emissions System Leaks
Leaks in the EVAP system or vacuum lines trigger codes and can affect engine performance.
The Risks of Ignoring Check Engine Light On
Understanding the risks helps you make informed decisions about your vehicle's care.
Don't Delay Repairs
A steady check engine light indicates a problem that needs diagnosis but isn't immediately critical. A flashing check engine light indicates a severe misfire that can damage your catalytic converter—reduce speed and have it checked immediately. Either way, don't ignore the light. Problems caught early are almost always less expensive to repair.
Fixing Check Engine Light On the Right Way
At Scott's Auto and Clutch, we start with a thorough diagnostic inspection to identify the exact cause of your problem.
We'll explain what we find in plain language and provide you with an honest quote before any work begins. No surprises, no hidden fees—just quality repairs from technicians who've been serving the Salt Lake Valley since 1990.
Our Repair Approach
- Comprehensive diagnostic inspection
- Clear explanation of findings
- Upfront quote before work begins
- Quality OEM or aftermarket parts
- Post-repair quality verification
Why Choose Scott's Auto and Clutch?
Trusted by Salt Lake Valley drivers since 1990.
35+ Years Experience
Our technicians have decades of hands-on experience diagnosing and repairing this exact problem.
Quality Parts
We use OEM and quality aftermarket parts that meet or exceed manufacturer specifications.
Same-Day Service
Many repairs completed same-day. We respect your time and work efficiently.
Honest Pricing
No surprises. We provide upfront quotes and explain every repair before we start.
Serving Drivers Experiencing Check Engine Light On
We diagnose and repair this problem for drivers throughout the Salt Lake Valley. Our shop is conveniently located in South Salt Lake.
Check Engine Light On FAQs
Common questions about check engine light on diagnosis and repair.
Other Symptoms We Diagnose
Clutch Slipping or High Engagement
Your clutch may be worn. We specialize in clutch diagnosis and repair.
Grinding Noise When Shifting
This often indicates clutch or synchronizer problems. Don't ignore it.
Stiff or Hard Clutch Pedal
A stiff clutch pedal indicates a problem that needs attention.
Transmission Slipping or Jerking
Your transmission may need service. Don't wait until it fails completely.