This means there is a stored trouble code on your vehicle's computer. Take your vehicle to a local auto part shop and ask them to scan your vehicle for engine codes. Most will do this for free. Post the code(s) you get here and I will let you know what they mean. Sometimes its as simple as a harmless sensor, sometimes more serious. If its something serious you would notice it though (rough idle, bad shifts etc.).
Thursday, November 5th, 2009 AT 5:15 PM