Speed Sensor Problems of Mazda MAZDA3

While driving the speed goes up and down on its own the automatic transmission of my 2008 Mazda 3 shifts down from the 5th to the 3rd gear. This causes the car to jerk violently and the controls to illuminate including check engine, no traction and at. My mechanic could not find a cause of this, and he serviced the transmission by changing the filter and transmission fluid but the problem persists. One mechanic said it is the speed sensor another the transmissions computer I have spend about 1,800 and I still have the same problems. It is very scary for my kids and myself while driving and I can't afford to get another car. What is the problems with Mazda with my car? can someone please help?! also all the electrical stop working about two years ago, another thing is the steering wheels problems when making a turn it really time forever and it is really slow and heavy.

See all problems of the 2008 Mazda MAZDA3 🔎.

Since the course of about a year, I have experienced traumatic moments while driving my vehicle pertaining to it's electrical/transmission functionality. When driving the vehicle at normal speeds (ex. 50mph) the Mazda would buckle, rev abnormally, all while my gear indicator would flicker. This would happen after about 10 minutes of driving and continue on for the remainder of the drive about every 20 minute interval. This is quite unsafe, and the repairs that multiple mechanics including Mazda themselves suggested to repair the issue did not accomplish anything unfortunately. Repairmen flushed and replaced the automatic transmission fluid, replaced my output speed sensor, changed out my shift solenoids, gear shifter, and even replaced my entire pcm. I have not only taken pictures and videos of these horrid incidences, but there seems to be other instances of people having this identical issue with their Mazda's as well. If there is a way to show my video examples for study, then I will gladly send them.

Vehicle has had, on several different occasions, been driven, not at any particular speed and lost 4th gear, the engine light appears, an at light appears, and the brakes are applied to downshift the car down to 3rd gear. Upon me noticing this. I wait until it is safe to stop at a red light or stop sign and make a complete stop shift the car into park and back into drive. This seems to fix the disappearance and removal of the 4th gear as well as the at light, but only occasionally. It does not however remove the engine light. Though after a few different trips on different days the light will not appear on start up and does not show up until this issue happens again. The car shows error code p0715 and is possibly needing a new transmission speed sensor. This issue has not been fixed.

See all problems of the 2006 Mazda MAZDA3 🔎.

I was driving along and suddenly a loud noise, the check engine light came on and the car shifted from 4th to 3rd without losing speed (except from me taking my foot off of the gas when hearing the noise) all at the same time. My mechanic said the diagnostic machine pointed to the "turbine speed sensor", so this was replaced within 2 days. The same day I got the car back, I drove it about 30 miles and it did the same thing again. Now my mechanic is checking into the transmission, possibly causing the problem.