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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Had a check engine flashing on my 90 gt 5.0. Went to autozone and dude read code and stated left side running lean. So I bought the LS O2 sensor and installed it. I did not reset the codes by disconnecting the battery. The light still comes on while driving. Is this normal or do I have some other problem? If I reset it... should it stop or should it have stopped blinking on when I replaced the sensor?