With time it will go off on itself without you having to turn it off. However you can still disconnect the battery for like 20 minutes and then reconnect to find it has gone off. The reason it lights is that it is counting the number of on and offs your car is going through without having a technical engine problems. With several on/off cycles it will go off by itself.
One of the biggest scams in the automotive/mechanic industry is the check engine light ? this annoying disease that pops up and doesn?t care to ever leave your sight. A lot of the time, the light comes on because of some intermittent or rare problem, like a cylinder misfiring when your car was starting. So what?s the typical scenario: The light comes on, you go to your mechanic, he/she reads the code ($80), and then tell you ?it could be anything, lets do a tune-up? ($150) ? before you know it their suggesting new oil caps ($20) and timing belts ($$$).
I drive a 97 Integra, and every so often my check engine light comes on. It happens rarely, when I haven?t driven in a couple days, and I start the car without giving it any gas. Just after the car turns on, I feel a slight, baby rumble ? cylinder misfired ? check engine light comes on. The first time it happened, I went to the mechanic and they took $80 to read the code ? crooks.
It depends on the Make and model of your car, for example, I drive a 2008 Tundra, to reset my "Check Engine" light, I turn on the switch, but do not crank the truck, then tap the gas twice quickly, all the way to the floor,, then the third time hold the gas pedal down for 10 seconds, let off, then turn the switch back off, and when you crank it, the light goes off. It is usually some little trick like that, but it varies from one vehicle to another. Also, Auto-Zone can sometimes reset it for you. Good Luck!!!
2 years ago
Last edited at 12:21AM on 9/11/2011
The following will work on any vehicle [note: if there is only a minor flaw in some system, the light will only rarely come back on, such as once every two months; but if the defect is serious, the light will come back on within a day or so; in that case, using the code you discover, as explained below, without switching off the light, have a mechanic repair the indicated problem's source, or do it yourself; the repairer then will delete the code (thereby switching off the light); the evidence of a good repair will be the light's staying off for many months]:
Purchase a low-cost OBD I (for pre-1996 models) or OBD II (1996 or later) code reader (under $40); connect it to the connector under the dashboard, in the general area of the steering-wheel shaft, at knee-level; read the code and write it down; press the 'delete code' button (thereby switching off the warning light); disconnect the reader. Now, if the problem is very minor, many days should go by before the light comes back on. If it was a 'fluke', such as a cylinder misfiring during starting on a very cold morning, you might never see the light coming back on ever for that particular code.