Check engine light

2004 MAZDA MPV
100,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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MCAVINEE
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The car that I was replacing the sensor on suddenly the check engine light will not come on at all now and caused a fail at e Check today. It was working fine yesterday and all I did was replace a sensor. What happened now? Thanks
Feb 8, 2018 at 7:28 AM
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JACOBANDNICKOLAS
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Does the light come on for a couple seconds when you first turn the key to the on position? If the light does not come on at all, the first thing I would check is the bulb itself.
Feb 8, 2018 at 6:19 PM
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MCAVINEE
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Thanks. Do you have instructions on how to remove the dash to get to it? Also, I am trying to get to that bank 1 sensor from underneath the car. Really not a lot of choices and not to keen on removing the plenum because of all the connections.
Feb 8, 2018 at 8:21 PM
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STRAILER
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I think you popped a fuse or the sensor shorted which made the fuse fail. Here is a guide to help you check the system fuses:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here are the fuse locations (below) along with a wiring diagram of the ALDL connector.

I would also see if a code reader will power up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
Feb 12, 2018 at 11:31 AM
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MCAVINEE
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Hello,
Thanks for all the diagrams. I went to a junkyard and pulled the instrument cluster out of the same model and installed it on my van. Now all the lights work including the check engine. I have to run through a drive cycle again and hopefully the check engine light will stay off. I have a OBDII scanner which is helpful. Only question I now have is, how to turn back the mileage to the correct miles? Thanks
Feb 12, 2018 at 4:04 PM
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STRAILER
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You cant, or I should say you will need to have it changed by someone that rebuilds the clusters because it is programmed in.
Feb 13, 2018 at 10:00 AM
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MCAVINEE
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I did it and it is working fine with the exception of the mileage of which I am keeping track of
Feb 13, 2018 at 10:04 AM
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STRAILER
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Perfect its all you can do. Glad you got the problem fixed though.

Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken
Feb 13, 2018 at 10:28 AM