CHICAGO – Instructors hired by the Illinois Environmental Protection Agency to train auto repair technicians in dealing with upcoming repairs based on readouts from vehicle onboard diagnostics (OBD) systems point out a number of potential shortcomings in using the OBD systems to diagnose emissions-related and other powertrain problems. Included are warnings that: Some major domestic-brand products report data erroneously due to the communication protocol. Readiness monitors are not ...
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