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There any many possibilities, but some of the most common are not replacing the gas cover correctly (tighly until it clicks) and the airbag sensor becomes unplugged (common after changing the oil). Make sure you're keeping up on replacing the oil, water, antifreeze, air filter, etc.

My light came on my 2001 Echo and I replaced the air filter (which I learned is not automatically changed at each oil change) and the Check Engine light would not go off. Tried this trick:

Http://wiki.answers.com/Q/How_do_you_reset_the_check_engine_light_on_a_2002_Toyota_Echo

.....Also, you could: "disconnect the negative battery connection. Press your brake pedal down for 10 seconds. Reattach your negative battery connection. The computer will be reset." ......

And voilà; ready and rearin' to go !

"Turning off the warning light" seems dangerous, but it really isn't. If the problem is REAL, the light will come on again the next time it is detected. If it is only a one-time glitch, you may never see it again. If it keeps coming back, THEN you should worry...

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โˆ™ 2007-10-23 07:55:25
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Q: What causes the check engine light to come on on a 2001 Toyota Echo?
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