Oldsmobile Q&A  Ask Your Question  2000 Oldsmobile Silhouette
Question: my service engine soon light stays on    zak, Livonia,
MI, December 30, 2009, 09:02  my service engine light stays on.
I have tightened by gas cap (maybe I need a new cap?). Could an
additive to my gas make a difference. thanks  1 Answer Flag This
• Answer #1      matte December 30, 2009, 10:23      This is the
check engine light, and it's reacting to a fault in your
emissions control system. If the gas cap doesn't resolve the
light, it will be something else, and you'll need diagnosis. A
fuel additive is extremely unlikely to make a difference.
Flag This