TechnicianVision · Knowledge base
asTech Publishes Four Tips to Read and Understand OBD-II Codes
I-CAR · December 12, 2018
Summary
This article highlights that the malfunction indicator lamp (MIL) or check engine light is not a foolproof indicator of vehicle issues, as some faults like calibration flaws will not trigger a DTC or light. It references an asTech publication designed to help technicians better read and understand OBD-II codes during diagnostics.
What to do on the job
Do not rely solely on the dashboard MIL or check engine light to determine if a vehicle has diagnostic trouble codes or calibration issues; always perform a complete diagnostic scan.
How to use it
Use this document to justify the necessity of pre- and post-repair diagnostic scanning even when there are no active warning lights or MILs illuminated on the dashboard, especially on vehicles with ADAS features.
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