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Old 05-01-2011, 03:43 AM   #1 (permalink)
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Default Resetting your Check engine light

Does anyone know how to reset your check engine light?

I removed my air box last tonight, unplugged the MAFS and for some dumb reason, I started the car without plugging in the MAFS back in, now I have a check engine light. I know the light is from the MAFS beginning unplugged and the car trying to start. I plugged it back in started the car. The check engine light is still on.
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Old 05-01-2011, 04:40 AM   #2 (permalink)
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A place like Autozone or Advanced should be able to do it for free. Otherwise borrow a scan tool from someone. I know on some cars you can reset the ECU by disconnecting the battery and letting the car completely discharge for about 30 minutes or so, not sure if this is true with the 6 though.
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Old 05-01-2011, 05:23 AM   #3 (permalink)
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Originally Posted by StlMazda6 View Post
A place like Autozone or Advanced should be able to do it for free. Otherwise borrow a scan tool from someone. I know on some cars you can reset the ECU by disconnecting the battery and letting the car completely discharge for about 30 minutes or so, not sure if this is true with the 6 though.
Disconnecting the battery and stepping on the brake a couple of times will reset the ECU which will then reset the CEL. If the CEL comes back on within a couple miles that means it's something else.

When I plug/unplug anything electrical from my car, I always make sure my battery is disconnected to prevent me from blowing any fuses etc.
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Old 05-02-2011, 08:36 PM   #4 (permalink)
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"Disconnecting the battery and stepping on the brake a couple of times will reset the ECU which will then reset the CEL."

I know disconnecting the battery will reset the CEL, but I didn't know about pumping the brake. Is this a "undocumented" Mazda feature?

Will the CEL finally go out on its own after about XX starts, if nothing is wrong?
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Old 05-03-2011, 12:16 AM   #5 (permalink)
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It went out on its own.
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Old 05-03-2011, 12:20 AM   #6 (permalink)
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Originally Posted by barriectaylor View Post
"Disconnecting the battery and stepping on the brake a couple of times will reset the ECU which will then reset the CEL."

I know disconnecting the battery will reset the CEL, but I didn't know about pumping the brake. Is this a "undocumented" Mazda feature?

Will the CEL finally go out on its own after about XX starts, if nothing is wrong?
Stepping on the brakes will help discharge any leftover electricity in the system. You could probably also accomplish this by turning on the headlights or anything else that draws power.
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Old 05-03-2011, 12:33 AM   #7 (permalink)
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yup. i always hit the brakes to. always has worked for me.
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Old 05-03-2011, 12:39 AM   #8 (permalink)
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yup. i always hit the brakes to. always has worked for me.
Until you got the AEM air straightener lol
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Old 05-04-2011, 12:38 AM   #9 (permalink)
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What about turning your key one to the start position with the neg disconnected?
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Old 05-04-2011, 01:15 PM   #10 (permalink)
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Until you got the AEM air straightener lol
FTW!
yup. havent seen that damn CEL since! best $5 dollar car part ive ever bought.
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