Check Engine Light Diagnostics in Longmont

Steady vs flashing light

A steady light can accompany many different faults. A flashing check-engine light can indicate a condition that risks catalyst damage and should be treated more urgently. If the vehicle is running badly, avoid unnecessary driving.

Codes need interpretation

A code can point toward a circuit, sensor reading, misfire, emissions condition or other system issue. Diagnosis uses the code together with vehicle behavior and testing.

What to tell the mechanic

Share whether the engine runs rough, lacks power, stalls, smells unusual, recently had repairs, or developed the light after fueling or other changes.