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6E–290 ENGINE DRIVEABILITY AND EMISSIONS Symptoms Default Section(s) Initial Diagnosis Backfire 1. OBD system check. balance test. 5. EGR operation, EGR system check. Exhaust System Diagnosis, Catalyst Monitor 1. OBD system check. Exhaust System Fuel Trim 1. OBD system check. sensors. Exhaust System Intake Air Evaporative Emissions 1. OBD system check. — Heated Oxygen Sensors 1. OBD system check. Exhaust System |