CarComplaints.com Notes: The only area of real concern for 2012 Mazda CX-9 owners is the brake booster.

In 2014, Mazda extended the warranty on the 2007-2013 CX-9 brake booster to 7 years / 90,000 miles. However this extended warranty has expired for most CX-9 owners, so buyer beware.

This Mazda CX-9 brake booster failure isn't terrible in terms of repair cost — it "only" costs $550 average to fix. However it is a safety issue when the brake booster fails as it increases stopping distance. Owners have reported having to stomp on the brake pedal, & crashes/injuries have been reported due to this CX-9 brake booster defect.

10.0

really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
2 / 0
Average Mileage:
150,708 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.

2012 Mazda CX-9 seat belts / air bags problems

seat belts / air bags problem

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2012 Mazda CX-9 Owner Comments

problem #2

Dec 012022

CX-9

  • 175,000 miles

A D V E R T I S E M E N T S

The contact owns a 2012 Mazda CX-9. The contact stated that on several occasions while driving at various speeds, the front passenger-??s side seat belt was tightening intermittently causing discomfort for the front seat passenger. There was no warning light illuminated. The vehicle had not yet been taken to an independent mechanic or a local dealer to be diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 175,000.

- Dane, WI, USA

problem #1

Dec 212020

CX-9

  • 126,417 miles
The contact owns a 2012 Mazda Cx-9. the contact stated that while driving over a speed bump at approximately 5 mph both the front and rear driver side and passenger side curtain airbags had erroneously deployed with out any impact occurring to the vehicle. During the incident both the front and passenger side seat belts had also activated and deployed to secure the occupants. The vehicle was taken to the local dealer joe maus Mazda located at 6735 E independence blvd, charlotte, nc who replaced the airbags and seat belts. The cause of the failure was not determined. The manufacturer was notified of the failure. The front passenger and driver both sustained minor neck and back injuries during the incident. The failure mileage was 126,417.

- Mint Hill, NC, USA

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