Two problems related to brake light on have been reported for the 2007 Mazda MAZDA3. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Mazda MAZDA3 based on all problems reported for the 2007 MAZDA3.
A few months after we bought our Mazda 3 we noticed the bulbs blew out well come to find out our lenses were melting and it got so hot the socket and bulb burst so we took it to the place we bought it and they warrantied them out well guess what the tail lenses we got replaced melted again and blew out the bulbs. We took our car to Mazda and the technicians found nothing wrong, no ground problem. Well we took it back to the place we bought it thinking they'd be able to warranty them out since they're less than a year well the lady wouldn't do it. Now I am stuck with my spoiler brake light and the passenger. So we decided to replace the brake switch and so far our passenger side hasn't blown out. I suggest replacing it and seeing what happens. It is a $30 part. Tonight I am buying new lenses and praying. I went through 4 bulbs in the driver and 3 bulbs in passenger. I need help figuring this out because $8 for a pack of bulbs every week is ridiculous.
The brake light housing (amber lens) was heated by the bulb to such a degree that the lens itself melted onto the bulb. We are not entirely sure when this happened and may have been ongoing for quite some time. Upon inspection by an experienced automotive technician, it was confirmed that the bulbs were the correct model and had been installed correctly. Some of the plastic had melted down onto the bulb itself and could potentially become a fire hazard. This problem impacted both driver and passenger sides, with the driver side appearing more significantly melted. After a quick search on Mazda forums, this appears to be an issue experienced by many owners of 2007 Mazda 3 models, but only those in the hatchback configuration.