Check Engine Light Diagnosis

A check-engine light means the vehicle’s diagnostic system has detected a fault. The stored code and operating information help guide testing, but they are not a parts list. NOFO evaluates the reported symptom and relevant systems before discussing a repair.

Bring any previous diagnostic or emissions-inspection report, and mention recent repairs or battery disconnection. Clearing a light does not repair the cause and can reset emissions-readiness monitors. If the light flashes or the engine runs severely rough, stop safely and contact the shop before continuing.

Signs that bring vehicles in

• A steady check-engine light that will not clear
• A flashing light (call before driving further)
• Rough running, hesitation or stalling alongside the light
• Failed or upcoming emissions inspection

What the visit involves

• Review of the warning, symptoms, stored fault information and relevant operating data
• Tests chosen to distinguish the reported fault from its possible causes
• Repair findings explained separately from any subsequent inspection or readiness check

Diagnosis before authorization

A request does not guarantee a specific diagnosis, price or completion time. The shop confirms the appointment, explains findings and obtains authorization before repair work moves forward.

Common questions