If your van needs a tune up would your check engine light go on?
Jan 1, 2009 at 2:07 AM
DAVE H
✓Experienced Mechanic
13,383 POSTS
the CEL comes on when the PCM detects a fault in the system .. ie. misfire/fuel lean/rich ... it does not tell you that your engine needs a tune up .. although in some cases a tune up can cure the fault detected ...