2003 Mazda MAZDA6 Problems

What owners report

Owners of the 2003 Mazda6 most often describe sudden loss of power or unintended acceleration traced to the throttle body, brake noise and judder on low-mileage cars, and clutch or shift-quality problems on manual models. Many reports come at low mileage, while a second group of complaints involves air bag non-deployment and long-running recalls.

1. 1
   Brakes

   Brake noise, judder and premature rotor wear

   • 21 complaints (12%)
   • median 10,000 mi at 1.8 yrs old (17 state mileage)
   • filed 2003–2010

   Owners describe grinding, squealing or moaning noises when coming to a stop and, in some cases, vibration or judder through the pedal. Complaints mention rotors that needed turning or replacement at low mileage, and brake lines found chafed or worn through against other components. Dealers are reported to have turned rotors, replaced pads, or in some cases said no fault was found. Many reports under 25,000 miles, with some at 50,000 to 114,000 miles.

   Recall 03V2070001 related service bulletin

   What to check: Have the front rotors and pads inspected for uneven wear, listen for grinding or moaning on a slow stop, and ask whether the brake lines have been checked for rubbing.

   2 excerpts from owner complaints in NHTSA records

   “2003 Mazda 6 2.3l a/t with 10,450 miles: right front disc brake component(s) failure. Took the car to a Mazda service center and was told a special repair kit was required but that Mazda was only authorizing the dealers to repair this under warrenty, on a case-by-case basis. I have not experienced brake failure at this time, and I have scheduled service to examine and repair.”

   NHTSA complaint #10058285, filed 2004-02, 10,460 miles

   “Front (right) end squeaks/grinds mainly while turning, however has continued after straightening out. Started around 10,000 miles. I've taken it in 3 different times to two different dealers. This last time (now at ~50,000) I was told it was a break pad problem and that: my break pads were 80% worn. My rotors needed to be turned. I was also now charged for this visit that still didn't fix the problem.”

   NHTSA complaint #10130625, filed 2005-07, 10,000 miles
2. 2
   Vehicle speed control

   Sudden loss of power / surging from throttle body

   • 20 complaints (11%)
   • median 106,145 mi at 8.5 yrs old (16 state mileage)
   • 1 mention a crash, fire or injury
   • owner-quoted repair $617 (median of 6 quotes)
   • filed 2003–2020

   Complaints describe the car dropping into a limp or safe mode with no response to the accelerator, sometimes with the tachometer fluctuating and all dash lights on; owners say shutting the car off and restarting restores normal operation. Other reports describe the opposite — engine speed climbing or the car surging without the pedal applied, even with cruise control off. Several say the dealer cleaned or replaced the throttle body, and in some cases the symptom returned. Reported from roughly 60,000 to 167,000 miles, often during stop-and-go or freeway driving.

   What to check: Ask whether the throttle body has been cleaned or replaced and whether any stored codes were found; on a test drive, note any hesitation, surging, or drop in power.

   2 excerpts from owner complaints in NHTSA records

   “When I take my foot off the gas it stays at the same speed or it speeds up on its own. When I press on the break sometimes it feels like it's not going to stop and just keep going or it jerks forward when I stop. This happens when I am driving on the road and the cruise control is not on when this happens.”

   NHTSA complaint #11343015, filed 2020-08, 159,185 miles

   “Beginning in 2006, my 2003 Mazda 6 would randomly experience power failure while driving. This was both scary and dangerous. I would be driving, the car would completely loose power with no warning and all the lights on the dashboard would come on. I would have to pull over, turn my car off and back on, and then it would work fine till it randomly happened again. Obviously loosing power at a high speed is extremely dangerous for both myself and the other drivers. …”

   NHTSA complaint #10242431, filed 2008-09, 61,000 miles
3. 3
   Transmission and drivetrain

   Clutch pedal failure and hard shifting (manual)

   • 9 complaints (5%)
   • median 53,000 mi at 6.1 yrs old (8 state mileage, few)
   • filed 2003–2019

   On manual-transmission cars, owners report the clutch pedal dropping to the floor and staying there, difficulty engaging first or second gear especially when cold, and clutch or pedal assembly replacement at relatively low mileage. Some describe the pedal bracket punching through the firewall and requiring an expensive repair. Dealers reportedly replaced the clutch or pedal assembly, and some owners were told the part was a known weak point. Reported from a few thousand miles up to about 115,000 miles, with several failures under 50,000 miles.

   What to check: On a manual car, press the clutch pedal slowly and check that it returns fully; ask for receipts showing whether the clutch or pedal assembly has already been replaced.

   2 excerpts from owner complaints in NHTSA records

   “My wife was driving our 2003 Mazda 6 with 56,000 miles to school on thursday morning on a busy 2-lane highway. She shifted (likely to 4th), and the manual transmission locked-up. Fortunately, she is an experienced driver and was able to disengage the clutch and coast the car to the shoulder without incident. If she had been inexperienced, or if a shoulder had not been available, or if the car behind her had been closer, the outcome could have been tragic. …”

   NHTSA complaint #10159674, filed 2006-06, 56,000 miles

   “We purchased a 2003 MAZDA6 new from a Mazda dealership. We had some issue with the car shuddering when engaging the clutch and called the dealership. We were told that the issue was related to variable valve timing and told to rev it a little higher when engaging the clutch. At approx 40,000 miles the clutch wore out and we tried to contact Mazda and file a claim, but we were denied. I paid to have the clutch repaired, and now have approx. 60,000 miles on the vehicle. …”

   NHTSA complaint #10217398, filed 2008-02, 40,000 miles
4. 4
   Air bags

   Air bags not deploying in a crash

   • 23 complaints (13%)
   • median 36,000 mi at 5.7 yrs old (7 state mileage, few)
   • 8 mention a crash, fire or injury
   • filed 2003–2019

   Complaints describe frontal or side impacts in which the air bags did not deploy, with deployment occurring late or not at all; some owners also report the air bag warning light staying on. Several vehicles were covered by Takata inflator recalls, and some owners said parts were not yet available when they asked for the repair. Reported from very low mileage up to high-mileage vehicles, across a wide range of years in service.

   Recall 19V781000 · DO NOT DRIVERecall 18V402000 · DO NOT DRIVERecall 17V474000 · DO NOT DRIVE1 related service bulletin

   What to check: Check the VIN against open air bag recalls and confirm with the dealer that the inflator recalls have actually been completed, not just scheduled.

   2 excerpts from owner complaints in NHTSA records

   “I hit a deer at 45 miles an hour then hit the hit totalling the car, the airbag did not come out, the seat belt did not lock causing me to be slammed into the steeling wheel, now I suffer great pain, can't move my neck, can't lay down bc of such bad headache I throw up, I sleep sitting up, something in the car like metal fragment hit me in the left eye, now I can barely see out of my left eye. And must continue medical treatment. …”

   NHTSA complaint #11252002, filed 2019-08, 11,800 miles

   “While driving at 45mph consumer's vehicle was hit from behind, causing it to rear end another vehicle. Upon impact, both frontal air bags did not deploy. Driver sustained minor injuries. Prior to accident, left front tire kept loosing air. Dealer re-beaded it but didn't found anything wrong with the tire. Dealer told consumer to come back if tires still losses air.”

   NHTSA complaint #10059210, filed 2004-02, 2,300 miles
5. 5
   Transmission and drivetrain

   Rough or delayed automatic shifting

   • 14 complaints (8%)
   • median 13,000 mi at 1.2 yrs old (13 state mileage)
   • filed 2003–2014

   Owners of automatic cars describe hesitation around 25 to 35 mph, clunking or jerking when the transmission picks a gear, and slipping or slamming into gear on acceleration. Some say the dealer could not reproduce the noise or fault, and a few report transmission replacement. Reported from a few thousand miles up to about 130,000 miles.

   1 related service bulletin

   What to check: Test drive at light and moderate throttle and feel for hesitation between gears; ask about transmission fluid service history.

   2 excerpts from owner complaints in NHTSA records

   “I purchased a 2003 Mazda six on 6-28-03. 2 months later the engine and other dash lights appear and car shuts off. I pick up the car 6 days later only to return it a week later when the engine light comes on again. A week later I pick it up on friday at 11:00 a.m. And by 7:00 p.m. All dash lights come on, transmission slipping, speed odometer erratic, and loss of power. It has been in the shop for 12 more days and they can not tell me anything. …”

   NHTSA complaint #10071087, filed 2004-01, 500 miles

   “I bought my car march 6, 2003. In may of 2003 it started making a howling noise when turning left at low speeds or into a parking space. I have brought it in 4 times and they cannot find the noise. For the last 2 months my transmission has been hesitating at around 25-35 MPH. It is like it doesn't know what gear to shift into and when it does it makes a loud clunking noise and my car jerks forward. I have had it in twice for that and they cannot find the source of that either.”

   NHTSA complaint #10067622, filed 2004-04, 7,000 miles

Buying note. Have a mechanic check the brakes and, on manual cars, the clutch pedal and shift quality before buying, and confirm that any open air bag recalls have been completed. Ask for service records on the throttle body and transmission, since owners commonly report needing both.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.