Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety. Notes: Except for a minor issue with cracked motor mounts, the 2007 MAZDA3 is a fantastic vehicle with a great reputation.

If you need to replace the motor mounts, first ask your dealer if they'll cover it -- the motor mounts were dealt with in a TSB & were recalled for some model years. Otherwise buy aftermarket motor mounts -- owners report this solves the problem. If you use the same OEM parts, they may just crack again.


really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
500 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2007 Mazda MAZDA3 engine problems

engine problem

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2007 Mazda MAZDA3 Owner Comments

problem #1

Aug 212007

MAZDA3 4-cyl

  • Automatic transmission
  • 500 miles


The resume function on the cruise control sometimes exceeds the set speed and fails to upshift. An example of the scenario is the cruise set speed is 75 mph. I approach a car going 65 mph and press the cancel button which disengages the cruise control. The car pulls over and I press the resume button. The transmission will sometimes downshift to either 3rd or 4th gear and quickly accelerate to 78 mph and stay in the lower gear. I am not touching any pedals nor the gear shift which is still in the auto position. The transmission will stay in the lower gear at the higher speed indefinitely. If I press cancel and then resume it will immediately shift to 5th gear and return to the 75 mph set speed. The problem is intermittent and has happened about 10-12 times in the last year. I do use the cruise function daily on the interstate, but don't encounter the described situation very often. I have tried to reproduce the problem a few times without success. I have taken the car to the dealer but they were also unable to reproduce the problem or find any other problems with the cruise function. They also stated there was no tech bulletin describing this problem. An email to Mazda was responded to by suggesting I take the car to the dealer. I am a very experienced driver. I know with absolute certainty that I am not touching any pedals and that the gear shift is in the auto position. This is not a case of driver error. There is a clear defect in the functioning of the cruise control or transmission operation. In every other way the cruise and transmission operation has been completely normal.

- Cary, NC, USA

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