Check Engine Light Diagnostics in Orange, CA

When the check engine light appears, it can indicate anything from a loose gas cap to a major electrical fault. At Joseph Harrington Automotive, we specialize in auto electrical diagnostics and use advanced scan tools to identify the root cause quickly and accurately. As an ASE Blue Seal of Excellence shop in Orange, California, we provide trusted solutions to keep your vehicle safe and reliable.

Common Causes of a Check Engine Light

• Failing sensors such as oxygen, MAF, or MAP
• Ignition coil or spark plug problems
• Fuel injector or fuel delivery issues
• Battery and charging system faults
• Emission system failures (EVAP, catalytic converter)
• Wiring or communication faults between modules

Our Diagnostic Process

• OBD-II Scanning: Retrieve codes and freeze-frame data.
• Live Data Monitoring: Review sensor and module activity in real time.
• Electrical Circuit Testing: Pinpoint open circuits, shorts, and poor connections.
• Component Testing: Verify suspected parts before recommending replacement.
• Root Cause Verification: Ensure the light won’t return after repairs.

Check Engine Light Services

• Comprehensive code scanning and interpretation
• Repair of ignition, fuel, or charging faults
• Module communication testing and repair
• Electrical wiring inspections and corrections
• Emission system troubleshooting and repair

Schedule Check Engine Light Service

Don’t ignore your check engine light—it could be a small problem now that grows into a bigger repair later. Contact Joseph Harrington Automotive today for accurate diagnostics and trusted repairs in Orange, California.

Request an appointment