| 1 | 0 | 3 | 4 | 3 | 4 |
Mazda CX-9 repairs by problem area
Engine (13%)
Transmission and Drivetrain (13%)
Brakes and Traction Control (9%)
Suspension and Steering (21%)
Electrical and Air Conditioning (26%)
Paint, Rust, Leaks, Rattles, and Trim (10%)
Other (7%)
Chart based on 924 repairs.
Mazda CX-9 engine repair cost distribution
$2500+ (4%)
$1000 - $2499 (7%)
$500 - $999 (17%)
$100 - $499 (25%)
< $100 (47%)
Chart based on 107 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.
2018 Mazda CX-9 4dr SUV
turbocharged 250hp 2.5L I4 6-speed shiftable automatic AWD
| 3000 mi | Computer, software upgrade, reprogram |
2017 Mazda CX-9 4dr SUV
turbocharged 250hp 2.5L I4 6-speed shiftable automatic AWD
| 7000 mi | Ignition coil failed. |
2016 Mazda CX-9 4dr SUV
turbocharged 250hp 2.5L I4 6-speed shiftable automatic FWD
| 79000 mi US $1600 |
PCM software update to fix CEL |
2016 Mazda CX-9 4dr SUV
turbocharged 250hp 2.5L I4 6-speed shiftable automatic AWD
| 15000 mi | Oil pan drain was damaged by dealer tech. It was replaced by dealer under warranty. |
2013 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic AWD
| 43000 mi US $600 |
Check engine light on. 1st trip replaced fuel cap. 2nd trip replaced cannister valve. 3rd trip replaced fuel cap again |
| 87000 mi US $125 |
Check engine light was on. Turns out fuel cap is letting gas in. Had changed the entire fuel intake line at the dealership 3 years ago for $1200 but seems like the issue has resurfaced |
| 22000 mi | Heat shield underneath car broke off |
| 39000 mi US $300 |
Heat shield underneath gas tank came unattached. Shield was removed due to it riding in the driveshaft. Need to take it back in and assess replacement. |
2012 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic FWD
| 45000 mi | Started hearing a loud, intermittent metallic rattling sound after last repair trip. Heat shield on exhaust was loose and the entire exhaust system is being replaced per an extended warranty on the parts. Six days and parts not here yet. |
| 46200 mi | Repair of exhaust system noted in 7/15 were completed after waiting 22 days for parts. Noticed heat shield rattling when A/C kicked on a few days later and had to return to dealer for repair. |
2012 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic AWD
| 31000 mi US $100 |
There was an issue with ignition wiring in one of the cylinders, causing a misfire and obviously poor performance. Oddly, no check engine light. Was covered under extended warranty. Dealer initially quoted replacing wiring for all cylinders, but only replaced wiring for the one cylinder after learning of the warranty. Don't recall total cost quoted, but I think it was ~$800. |
| 61000 mi | Failure of valve cover gaskets, front engine seal, multiple engine seals all failed at same time. Emissions controls also failed and were replaced. They obviously didn't do a good job because the valve cover gaskets and a seal on the side of the engine failed again a week later. I was told that the gaskets were installed improperly due to the lack of room, can't see what you're doing. |
| 61000 mi | I had it with this car. The car would constantly stall while driving or in park or whenever. There are 6 codes currently showing on computer and with all the past issues we gave up on this car It's a lemon |
| 15900 mi | Rattling at certain RPM during acceleration. Dealer replaced an exhaust pipe. The noise is still there after the repair. Because it is not a safety issue, this will be addressed during the next PM visit to the dealer. |
2011 Mazda CX-9
Engine not specified
| 3100 mi | Initially, knocking noise from front right, mainly when turning left (no brakes applied). Ended up happening also when driving slowly and turning steering wheel left to right. Work Done: Replaced right engine mount. Fixed problem. |
2011 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic FWD
| 12000 mi | Loud buzzing metal rattle from underneath vehicle towards firewall when accelerating, low speed to near shift points as engine revs. Sounds like loud exhaust rumble. Could not duplicate when at dealer, but vehicle inspected underneath. |
| 5000 mi | heard a slight ticking noise from the engine under light load and low RPM. dealer could not replicate but advised that Mazda is aware of this common issue and has issued a notice that they are aware of the sound but not to be concerned. |
| 9000 mi | Ticking noise coming from engine off idle. |
| 11000 mi | dealer agreed to replace engine to resolve the ongoing ticking issue |
| 128000 mi | Had coolant leak. Found out the drain plug was cracked and almost sheared off. A large rubber washer originally hid the defect. Mechanic replaced the drain plug. As I am a regular customer, there was no charge to replace the plug and top off the coolant. |
| 130000 mi US $175 |
Oil pressure sending unit had a leak. Was leaking on air compressor which kept oil from leaking on driveway, so only upon oil check light coming on, I was unaware of the leak. Unit was replaced and oil change included. |
| 45000 mi US $80 |
Had oil leak almost the entire time I had it. I paid $80 for them to tell me that I didn't have leak. Sold with leak. |
| 144000 mi US $75 |
Replace thermostat and upper radiator hose |
| 30000 mi | Replace Fuel Sensor |
| 106000 mi US $249 |
Spark plugs replacement |
2011 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic AWD
| 80700 mi | Replaced failed purge valve |
| 125776 mi US $1500 |
Replaced #4 fuel injector and all spark plugs |
| 161000 mi US $635 |
#5 fuel injector replaced as well as all spark plugs (fouled). |
| 98000 mi US $150 |
Engine ping/knock under load between 2000-3000 rpm. Had extended warranty so tried to get engine serviced before 100,000 miles. First attempt, dealer said they could not reproduce. 6 months later I took the car to a different dealer and drove with a mechanic who heard the noise. They said it was a rattle in the pre-cat. I completely disagree. This is not a rattle, it's a spark knock. It's gotten worse over the past year. Super loud when the engine is cold. Fuel trims look good. I really think it's a timing issue. I've done almost everything short of pulling the heads. |
| 112000 mi US $75 |
Replaced one failed fuel injector and replaced O-Rings on all injectors while I had the fuel rail off. |
| 4960 mi C $54 |
Hesitates when starting from time to time. Have to let it crake for a while and some times have to turn it off and try again. When taking in for oil change no problem was found, as it started fine each time tried |
| 56000 mi US $180 |
Corrosion on exhaust pipe with hole in system. New pipes fabricated and replaced corroded ones. |
2010 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic FWD
| 7800 mi | Leak from damaged oil filter and missing drain plug gasket from poorly performed dealer oil change. Replaced oil filter myself and dealer replaced drain plug/gasket. |
| 32000 mi | Gas cap warning light would come on intermittently. Cap was tested and found to be leaking. Replaced under warranty. |
| 34700 mi | Gas cap warning light started coming on again. Fuel tank solenoid valve replaced under warranty. |
| 96000 mi US $750 |
Check engine light on. Coded for bad injectors on one cylinder. Changed all 6 of them |
| 68200 mi US $400 |
throttle body replacement |
| 114000 mi US $200 |
Coolant fan relay failed. It was replaced. |
| 28000 mi | check engine lite came on. stopped by dealer. light reset. lite came back on again IN THREE DAYS. went back to dealer. diagnosed as bad fuel pressure sensor. part ordered. will install next week.....all warranty! |
2010 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic AWD
| 134000 mi US $5500 |
Replaced with a used engine with 64 K miles and the water pump. A time up was also done. |
| 74000 mi US $200 |
Removed rusted bolts from heat shield and put in new ones Removed rusted bolts from heat shield and put in new ones |
| 11000 mi | Experienced a severe sulfur/burning smell once the car was warmed up and on the road. Dealer could not replicate; we were told it was normal and provided a TSB for several different Mazda models regarding the catalytic converters. |
| 29000 mi | Experienced hesitation under light load, and manual shifting was not working. Bad driveshaft identified; did not fix the problem. Dealer replaced the driveshaft, transmission, and ignition coils under warranty. |
| 50220 mi C $150 |
Engine light came on for second time in 3 months. First issue said to be fuel pressure sensor. This time was ignition coil and spark plug for cylinder # 4. After both repairs, car ran fine. |
| 78120 mi C $500 |
Leaking water pump replaced. |
2009 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic FWD
| 127000 mi US $400 |
Radiator was leaking from a crack in the inlet by the upper hose. Radiator had to be replaced. |
| 137000 mi US $1450 |
Replace radiator coolant |
| 29000 mi | Engine trouble light, gas cap light and other warning coming on. Dealer said it needed new sensors - cost over $1,000. I disconnected battery and waited 30 minutes then re=connected battery. Now all lights are off and no trouble now. |
2009 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic AWD
| 90400 mi US $350 |
Ignition coil on back cylinder |
| 24000 mi | Check engine light came on, reset gas cap and drove, light stayed on. Went to dealership 8:00 a.m. with no appointment, gas cap replaced and computer reflashed in 90 minutes. |
| 78000 mi US $875 |
Heat shield loose at rear of car, making noise. |
| 46000 mi US $125 |
Replaced MAF sensor. |
| 98000 mi US $350 |
Plugs and a bad coil on cylinder 1, forced a check engine code. Was coming up several times and couldn't be diagnosed by dealer |
2008 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic FWD
| 33000 mi | Two problems. Car running on only 5 cylinders. one cyl not working due to bad Ignition coil. So engine struggles on uphill. Rear blower starts when ignition key is turned off. |
| 37000 mi US $250 |
Ignition coil on the 5th cylinder was not working. Got the Ignition coil from a external source($90 vs $140) and paid for the labor and spark plug. |
| 57000 mi US $800 |
Two ignition coil damage and one fuel injector |
| 1000000000 mi US $600 |
Fuel injectors were gunked up. 1 cylinder wasn’t firing because the cable running power to the injector was loose at the connection site |
| 142000 mi US $300 |
oil change |
2008 Mazda CX-9 4dr SUV
273-horsepower 3.7L V6 6-speed shiftable automatic AWD
| 68000 mi US $180 |
Replacing the AC belt, which started to crack as previously inspected. |
| 60400 mi US $200 |
oil leak. Dealer found aftermarket drain plug was ill fitting. Replaced it and leak stopped |
| 95000 mi US $865 |
Replaced rear main seal. |
| 101000 mi US $370 |
Replaced serpentine belt and Tensioner |
| 56000 mi US $130 |
Loose heat shield, louder than normal engine noise due to rattling. |
| 198000 mi US $400 |
oil pressure regulator. |
| 102000 mi US $150 |
Front Muffler rusted, repair shop did not have part, inserted straight pipe. Still has both rear mufflers. Little louder than stock. |
| 110000 mi US $725 |
Replaced front muffler assembly |
| 85000 mi US $850 |
Heat shield between drive train and cabin rusted out and had to be replaced. |
| 46300 mi US $577 |
Spark plugs replaced. |
| 100000 mi US $93 |
Worn drive belts. Replaced 2 belts and belt tensioner. |
| 28000 mi | Knocking sound when cold. Unsuccessful, suspected in intake. Goes away when warm and is not heard unless below 40 degrees. |
| 10000 mi | Intermittant coolant odor present at 40 degrees+ in traffic/ in garage. Unable to find leak or repeatedly find issue, it happens in slow traffic and when fresh air is coming in (not on recirculate) Same issue since new, annoying for such a great car. |
| 24000 mi | Ticking sound from engine at 1500rpm under acceleration/load. Dealer found TSB related to problem. Dealer re-flashed computer and issue was gone. |
| 19840 mi | Engine speed surging at hot idle |
| 75820 mi C $500 |
Replaced serpentine belt |
| 121500 mi C $200 |
Drive belt and alternator belt replaced |
| 124620 mi | Drive belt was about to fail due to improper installation by dealer. |
| 89800 mi US $1500 |
4 coils needed to be replaced |
| 75000 mi | Serpentine belt replaced as it showed signs of aging (cracking) |
| 68050 mi US $50 |
Replaced all 6 spark plugs to address a hesitation issue during acceleration or maintaining speed up inclines. New plugs resolved issue. |
| 30300 mi | Motor mount replaced. |
| 43900 mi | Rattle caused by loose bracket. Bracket tightened. |
| 14000 mi US $46 |
Rough Idle, died sometimes when idling. Dealer replaced throttle body, problem solved. |
| 89280 mi C $50 |
Heat shield loose. Replaced bolts and reattached |
| 82000 mi US $950 |
Spark plug replacement and throttle body cleaning |
| 80100 mi | engine computer tripped posting 5 check engine codes |
2007 Mazda CX-9 4dr SUV
263-horsepower 3.5L V6 6-speed shiftable automatic FWD
| 149000 mi US $6000 |
Original radiator had slow leak caused overheating of engine. Oil water mixed. Instead of head gasket fix, I decided on engine swap to hopefully last another 3-5 years... |
| 101500 mi US $700 |
Throttle position sensor failed |
| 96000 mi US $2000 |
Faulty ECU |
| 79500 mi US $3850 |
Overheating, loss of power. Excessive noise. |
| 89000 mi US $2350 |
Camshaft |
| 30000 mi | Smart key - sometimes steering column will not turn to start car. Happens about once a month. Tried both fobs and car has wheels straight. After a few minutes there is a click in the steering column and you can turn it to start. Key shows recognized. Read about transmission sensor causing CX9 to go into shut down when ascending long hills. They said that while they would not repair unless it actually happened first, that my vehicle was not equipped with the faulty sensor. |
| 36000 mi | Even though smart key fob recognized could not turn egnition switch |
| 78000 mi US $400 |
Hole in exhaust pipe at hanger |
| 117000 mi US $100 |
Failed/Melted coil pack (probably since I had not changed the plugs). Replaced coil and plugs (and intake plenum gaskets) |
| 118000 mi US $700 |
As described before, replacement of the coil did not fix my issue (melted coil). These engines can have PCM failure resulting in melted coil(s). I sent the PCM off to be repaired, all new coils and plugs... running perfect again. As described before, replacement of the coil did not fix my issue (melted coil). These engines can have PCM failure resulting in melted coil(s). I sent the PCM off to be repaired, all new coils and plugs... running perfect again. |
| 121500 mi US $70 |
I replaced all six coils with the previous repair, one coil failed. I replaced the coil and it seems to be running fine again. The coil was an aftermarket part. |
| 152000 mi US $50 |
Also, check engine light come on and off. One of the catalytic converter needs to be replaced soon. |
| 155000 mi US $50 |
Coil failed, replaced and good to go |
2007 Mazda CX-9 4dr SUV
263-horsepower 3.5L V6 6-speed shiftable automatic AWD
| 82000 mi US $2600 |
bank of coils failed and shorted the computer. Coils(6) and computer were replaced |
| 200000 mi US $50 |
Loose heat shield near gas tank re-attached. These heat shields seem to come loose on a semi-regular basis. |
| 10540 mi | Vehicle lost power on steep hills.. TSB issued 2008 May (only for certain vehicles withing a block of vins). Most consumers unaware of issue. My dealershp was surprised! TCM module updated with most recent software.. Vehicle runs like a charm! |
| 18000 mi | RPM FLUCTUATED WITH A/C ON. |
| 19000 mi | Throttle body successfully replaced. |
| 4000 mi | Engine oil sending unit. |
| 41000 mi | Transmission control module failed. Vehicle would not shift gears and could only be driven in reverse or 2nd gear. |
| 99000 mi US $130 |
Front timing cover leaking oil - reseal |
| 119500 mi US $200 |
Heat shield under vehicle corroded at mounting points. Shield then dropped onto driveshaft. Heatshield was replaced. |
| 58500 mi | Heat shield above the drive train had 2 pop rivets fall out |
| 72000 mi US $174 |
Bad Fuel injector. I had an extended warranty that paid the majority of the cost. |
| 120000 mi US $2000 |
Replaced the full exhaust system |
| 61200 mi | Radiator sprung a leak in the upper part of the radiator. I smelled the anti freeze and say dried pale green powder on the front grill work. We have an extended warranty that covered the cost of the repair. |
| 149000 mi US $1200 |
Also fluid added to transfer case and ECU removed and repaired and reinstalled. |
| 131000 mi US $500 |
Rats had chewed through the wiring harness for the fuel injectors. Wires were spliced |
| 104000 mi US $25 |
Strange noise that was related to car movement. Turned out to be a heat shield on muffler hitting drive shaft. Solution was to bend it. |
| 137000 mi US $120 |
Engine light came on, diagnosis inconclusive of crankshaft position correlation, but nothing was found. After reset, engine light came on again a few days later, another service appointment is scheduled. |
| 140000 mi US $520 |
Replaced the Oil Pressure Sensor. Engine light still on after repair. Everything else checks out fine, so running it with the engine light on until something else appears. |
| 144000 mi | Antifreeze mixed with engine oil. Either water pump leaking into engine or one of the head gaskets. Decided not to invest the money into the vehicle and sold it. |
| 64000 mi US $537 |
Cylinder 3 fuel injector failed causing a miss and engine check light. |
| 96720 mi | Replaced and flushed cooling system. |
2007 Mazda CX-9 4-door
6-cylinder automatic 2WD
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See TrueDelta's information for all Mazda models.
