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Hey I came here for help. I have a 2004 Mazda 3 2.3 engine. Love the car it's a hatchback. A week ago on my way home I was doing 65 mph however, my speedometer was reading 80 mph and then it jumped to 140 mph. I thought it was my speed sensor but I have no codes.

Any help? I appreciate any information.
Thanks.
El Flaco.
 

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Not all the cars throw a code for the Speed Sensor. I would bet that's what it is! Go to a junkyard or order a cheap one on eBay. I'm pretty sure your speed sensor is going out...(Again, not all car shows a check engine light or error code for the speed sensor) Keep us posted!
 

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Demon Spawn
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as stated above not all the time will a bad speed sensor throw a code, as its not telling the computer anything bad, just passing the wrong info along, have the codes checked, it maybe pending still and hasn't tripped the light on, it takes most codes 3 drive cycles of the issue persisting to throw the light on
 
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