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Check engine light

Tiny
MCAVINEE
  • MEMBER
  • 2004 MAZDA MPV
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
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
Thursday, February 8th, 2018 AT 7:28 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
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.
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Thursday, February 8th, 2018 AT 6:19 PM
Tiny
MCAVINEE
  • MEMBER
  • 69 POSTS
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.
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Thursday, February 8th, 2018 AT 8:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,628 POSTS
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
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Monday, February 12th, 2018 AT 11:31 AM
Tiny
MCAVINEE
  • MEMBER
  • 69 POSTS
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
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Monday, February 12th, 2018 AT 4:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,628 POSTS
You cant, or I should say you will need to have it changed by someone that rebuilds the clusters because it is programmed in.
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Tuesday, February 13th, 2018 AT 10:00 AM
Tiny
MCAVINEE
  • MEMBER
  • 69 POSTS
I did it and it is working fine with the exception of the mileage of which I am keeping track of
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Tuesday, February 13th, 2018 AT 10:04 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,628 POSTS
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
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Tuesday, February 13th, 2018 AT 10:28 AM

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