"How reliable is the 2018 Mazda Cx-9?"

"Based on 162 NHTSA complaints, the 2018 Mazda Cx-9 has a median complaint mileage of 18500 miles. The most common issue is ENGINE."

"What are common problems with the 2018 Mazda Cx-9?"

"The most frequently reported component in NHTSA complaints for the 2018 Mazda Cx-9 is ENGINE, accounting for a significant portion of the 162 total complaints filed."

2018 Mazda Cx-9: Reliability Data

Source: NHTSA — 162 complaints

162

Total Complaints

18,500mi

Median Mileage

ENGINE

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

10,300 25th Percentile

18,500 Median Mileage

35,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

ENGINE

UNKNOWN OR OTHER

ELECTRICAL SYSTEM

POWER TRAIN

SERVICE BRAKES

FUEL/PROPULSION SYSTEM

STEERING

VISIBILITY/WIPER

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

ENGINE AND ENGINE COOLING

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"I PURCHASED A NEW MAZDA CX-9 IN SEPT 2017 BECAUSE IT HAD THE HIGHLY TOUTED SMART CITY BRAKING SYSTEM FOR WHICH I PAID THOUSANDS EXTRA. I HAD HAD A PREVIOUS REAR END COLLISION AND WANTED TO BE SURE THIS SYSTEM WOULD AT LEAST WARN ME. I SET UP SOME CARDBOARD BOXES WRAPPED IN ALUMINUM FOIL. I SLOWLY (1..."

"ON FRIDAY (JUNE 29TH, 2018) AROUND 9:29 PM, MY CAR BROKE DOWN WHILE MY FAMILY AND I WERE TRAVELING FROM ROCHESTER NY TO BOSTON MASSACHUSETTS. I WAS DRIVING DOWN THE MASSACHUSETTS TURNPIKE WHEN ALL OF A SUDDEN MY CHECK ENGINE LIGHT TURNED ON AND MY CAR JUST STARTED TO SLOW DOWN IN THE MIDDLE OF THE H..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28