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Check engine light and Utah emissions

A lit check engine light means the vehicle has detected a fault. In the five testing counties it also means an automatic OBD emissions failure.

What the sources say

Under the Cache County I/M regulation, if the malfunction indicator light (MIL) is commanded on while the engine runs, the vehicle fails regardless of codes. Clearing codes right before a test usually leads to a readiness rejection instead. A shop can tell you when the vehicle is ready for a retest. (Source: Bear River Health Department (Cache County); Utah Division of Motor Vehicles)

Next step

Have a certified (ASE) mechanic inspect it. This guide does not diagnose vehicles and does not give repair steps for safety systems. For costs, see the emissions testing guide and the cost guide.

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