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The AT dashboard light on the Mazda 6 means there is a problem with the transmission.
Speed sensor....on transmission need changing....
Talk to your Mazda dealer but, it sounds like a problem with your automatic transmission and just like a check engine light it may be a number of problems.
the reverse light switch.. aka backup light switch is located on the front of the transmission along the side screws into the transmission if standing in front of the car looking down at the transmission you can see it
You might have a broken or worn transmission/engine mount.
The answer is on page 11 in the owner's manual ( "Light is blinking" ). Engine is misfiring, bring it to a garage as soon as possible.
This indicates a problem with the transmission. Take it to a professional.
Either next to shifter or attached to transmission
There is a problem with the transmission. Check the fluid level and if it is full, seek out professional help.
The HOLD light means you have an electrical problem with your transmission. See your mechanic ASAP.
You need a new transmission.
get a new transmission