For example it needs the 5th shift like at 50 miles
Aug 2, 2012 at 10:33 PM
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CARADIODOC
✓Experienced Mechanic
34,413 POSTS
That light is to tell inspectors when to shift to keep the emissions within acceptable levels, not to tell you when to shift. If you shift when the light turns on, emissions will stay very low. You can still shift when it feels right. Don't worry about the light.