Engine Diagnostics

Advanced technology meets experienced mechanics to solve your check engine light mysteries.

Engine diagnostic equipment at Larson Repair
Latest Technology
OEM-level diagnostics

Don't Ignore That Light

The check engine light isn't just an annoyance—it's your vehicle's way of telling you something needs attention. Modern cars have sophisticated computer systems that monitor everything from emissions to engine performance. When something's off, the computer stores a trouble code.

Our shop uses professional-grade diagnostic equipment that reads these codes and gives us detailed information about what's happening under the hood. We'll explain what triggered the light, whether it's urgent or can wait, and what your options are.

Common causes include a loose gas cap, oxygen sensor issues, catalytic converter problems, or engine misfires. Some are quick fixes, others need more attention—but we'll always give you the straight story.

Schedule Diagnostics

Diagnostic Services

Complete diagnostic solutions for all vehicle makes and models.

Check Engine Scan

Read and clear diagnostic trouble codes (DTCs). Includes explanation of what triggered the light and severity assessment.

$89

Full System Scan

Comprehensive scan of all computer systems including ABS, airbags, transmission, steering, and emissions controls.

$129

Performance Diagnosis

Diagnosis of rough idle, poor acceleration, stalling, low power, and other drivability issues with test drive included.

From $149

Emissions Testing

Pre-inspection diagnostics and repairs to help your vehicle pass state emissions testing the first time.

From $99

Electrical System

Complete electrical diagnostics including battery, alternator, starter, and wiring issues affecting computer systems.

From $119

Pre-Purchase Inspection

150-point inspection including comprehensive computer scan before you buy. Know what you're getting.

$149

Common Check Engine Light Causes

These issues trigger the check engine light most often.

Loose or Damaged Gas Cap

Simple fix—sometimes the cap just needs tightening. But damage or worn seals can cause fuel vapor leaks.

Oxygen Sensor Failure

Measures exhaust oxygen content. A failed sensor reduces fuel efficiency and can damage the catalytic converter.

Failing Catalytic Converter

Often a downstream issue from other failures. Causes poor performance and can be expensive to replace.

Mass Air Flow Sensor

Measures air entering the engine. Dirty or failing sensors cause poor acceleration and rough running.

Frequently Asked Questions

Common questions about engine diagnostics.

It depends. If the light is steady, the issue may not be urgent but should be checked soon. If it's flashing, that's a warning of a severe problem—stop driving immediately and have it towed. A flashing light often indicates an engine misfire that can cause catalytic converter damage.

Intermittent issues are common and can be tricky to diagnose. The code is stored in the computer's memory, so we can usually retrieve it even after the light goes off. Conditions like heat, vibration, or specific driving patterns can trigger the light temporarily.

Basic code readers show the code number but not the detailed data that professional scanners provide. Our diagnostic equipment can access manufacturer-specific data, live data streams, and perform specialized tests that give us a complete picture of what's happening.

Basic code reading takes 15-30 minutes. Full system scans and performance diagnostics typically take 1-2 hours. If we find issues that need further diagnosis, we'll give you a time estimate before proceeding with any repairs.

Check Engine Light On?

Don't wait until a small issue becomes a big problem. Get it checked today.