About This Service

When your check engine light illuminates, it's your vehicle's way of telling you that something needs attention. This warning light can indicate a wide range of issues, from something as simple as a loose gas cap to more serious problems with your engine, emissions system, or other critical components.

At D&H Auto Works, our certified technicians use advanced diagnostic equipment to read the specific trouble codes stored in your vehicle's computer system. We then perform additional tests as needed to pinpoint the exact cause of the problem, rather than simply replacing parts based on generic code descriptions.

Our comprehensive approach ensures that we identify and address the root cause of the issue, saving you time and money while getting your vehicle back on the road quickly and safely.

What's Included

• Comprehensive computer scan of all vehicle systems
• Retrieval and interpretation of diagnostic trouble codes (DTCs)
• Visual inspection of related components
• Testing of sensors, actuators, and circuits as needed
• Verification of the diagnosis through additional testing
• Detailed explanation of findings
• Repair recommendations with transparent pricing
• Post-repair verification to ensure the issue is resolved

Common Check Engine Light Causes

While there are hundreds of potential reasons for a check engine light to illuminate, some of the most common include:

• Oxygen Sensor Issues: Affects fuel efficiency and emissions
• Loose or Damaged Gas Cap: Causes fuel system pressure problems
• Catalytic Converter Problems: Affects emissions and performance
• Mass Airflow Sensor Malfunction: Impacts engine performance and fuel efficiency
• Spark Plug or Ignition System Issues: Causes misfires and poor performance
• EVAP System Leaks: Results in emissions problems
• Exhaust Gas Recirculation (EGR) System Issues: Affects emissions and performance
• Fuel System Problems: Impacts engine performance and starting

The Process

Our check engine light diagnosis process begins with a conversation about any symptoms you've noticed, such as performance issues, unusual noises, or changes in fuel efficiency. This helps our technicians focus their investigation on the most likely causes.

Next, we'll connect our diagnostic equipment to your vehicle's onboard computer system to retrieve any stored error codes. These codes provide valuable clues about which systems or components may be malfunctioning.

Based on the codes retrieved and your vehicle's symptoms, our technicians will perform additional tests to confirm the diagnosis. This may include visual inspections, electrical testing, pressure testing, or other specialized diagnostics depending on the specific issue.

Once we've identified the problem, we'll provide you with a detailed explanation of the issue and a transparent estimate for the necessary repairs. Most diagnostic services can be completed in 30-60 minutes, though complex issues may require additional time.

After completing any repairs, we'll clear the codes from your vehicle's computer and verify that the check engine light does not return, ensuring that the issue has been fully resolved.