When the 'check engine' light goes on, many people panic.

Consumer Reports says it can be any of hundreds of problems from something as simple as a loose gas cap, or as serious as a failing catalytic converter.

Mechanics say a good rule of thumb is if the car feels normal, its okay to drive it to get to a mechanic.

A computer program tells the mechanic where to check the car for problems. When the 'check engine' light goes on: - If its flashing or your car is stalling or misfiring, get service immediately.

- Otherwise check that your gas cap is tight. If it was loose, the light may take several days to turn off.

- If the light doesn't go off by itself, take your car into the shop within a week.

If the light stays on, not only does this mean there is a problem, but it could also mean long-term damage to the vehicle. Another important reason to have your car checked when the light comes on: There's a good chance you'll fail the state emission test.

There are inexpensive devic es you can buy to read the code yourself. But Consumer Reports says unless you know a lot about cars, you're probably better off taking your vehicle to a mechanic.


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