2023 MAZDA CX-5 Engine Problems

Vehicle is a 2023 Mazda CX-5 Signature Turbo model that had a leaking hydraulic tensioner for the serpentine belt at 15,759 miles. Mazda technician cleaned the hydraulic tensioner, and less than 500 miles later the leak returned. This is common enough in the community to expand TSB’s on this part.

Summary of Events: Purchase Date: 05/27/2023 Coolant Warning: In January 2025, I received a coolant temperature warning (code P0126) indicating insufficient coolant temperature. Repairs: I brought the vehicle in for repairs on 02/15/2025 for thermostat and related parts. The repairs were completed by 02/17/2025. New Warning: On 03/18/2025, I received a high coolant temperature warning. Upon inspection, coolant was nearly empty, and I found coolant contamination in the engine bay. Notification to Dealership: I emailed Hennessy Mazda on 03/19/2025, but after no response, I filed a claim with Mazda headquarters on 03/20/2025. Only after that, they called me and instructed me to bring the vehicle in. They claimed that after replacing the faulty parts and cleaning the engine bay, the car was ready for pickup. (While they assert that all actions were completed on 03/22, Based on the fact that the car door was opened approximately five times in April,...

Engine light came on. Immediately brought to dealer. Always serviced at dealership. One previous occurance of illuminated light reading major engine malfunction. Pulled car to side of road, called dealership who advised turn off and back on. Didn't tell me about ALL the problems that Mazda was aware of. Now I'm told my new car with 22k miles has a blown engine. No notification from Mazda about a known problem. Asked when buying the car if there were any major problems with this car. Mazda apparently lies.

The Low Oil Warning Light comes on between oil changes. I think this is the 3-4th time. I will have to add 1 quart of oil to the car after 3000-4000 miles. I only have about 33,000 miles on this vehichle and do the oil changes myself. I checked for leaks at the oil filter and oil drain plug. No indication of oil leaking or I would see it on the floor of my garage. What component or system failed or malfunctioned, and is it available for inspection upon request? Engine using excessive amounts of oil. It could be available for inspection How was your safety or the safety of others put at risk? Has the problem been reproduced or confirmed by a dealer or independent service center? I plan to take it into the dealer for next oil change and report it. Has the vehicle or component been inspected...

I love this car, but it has a bad habit, the vehicle accelerates on its own. If you take your foot off the gas, the car will intermittently lurch, almost jump forward. I’ve learned to deal with this by simply keeping a strong push on the break, but it is definitely is an issue. Another issue I’m having is the back lift gate. I’ve been told that the sensors are on each side of the gate and perhaps when drying the vehicle, I touch them😳 they run along each side of the liftgate fully visible. I have 17,000 miles on my car right now and when the lift gate opens closes it stops halfway and it beeps. I then have to push it down to close. I took it to the dealer and they say it will cost me if they have to check the sensors. This is extremely annoying...

Mazda CX-5 Premium Between May and September this year, the MyMazda app has alerted me two times that the oil level was low. I manually checked and it was indeed low. The first time I brought it to a Firestone service center to have it checked and they verified that the level was down considerably to the bottom dot on the stick. They said to bring it to the dealer. I brought it to the dealer and they said they could not find any leaks and to come back in 1000 miles. I did that and they only checked the dipstick to make sure the level was fine and sent me on my way. The same exact thing happened again a week ago and I topped off the oil then made an appointment. The dealer said that I should not have done that and now they could not verify for...

When applying the brakes car surges forward. If put in neutral engine races. Very difficult to bring to a stop with reduced braking. Multiple occurrences. Dealer states vehicle is operating within design perimeters.