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Home >> Buick >> 1990 >> Reatta 2D Convertible, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - ECM >> Entering Self-Diagnostics >> Exit Self-Diagnostics

Exit Self-Diagnostics

During self-diagnostic procedures, it is possible to exit service mode without erasing trouble codes. By depressing BI-LEV button on the ECC panel and turning ignition switch to OFF position.