2003 Mazda MAZDA6 engine problems
10 owner complaints filed with NHTSA name the engine on the 2003 Mazda MAZDA6 — 6% of all complaints for this model year.
What owners report
“2003 mazda6 model cars were built with faulty throttle bodies. Unaware of this, I bought one of these vehicles and immediately began experiencing issues with it. When driving very slowly, under 15 mph, the car will suddenly throttle, accelerating it in bursts even when applying the brakes. That…”
filed Aug 21, 2017
“Tl* the contact owns a 2003 mazda 6. The contact stated while inspecting the vehicle, an unknown fluid started leaking onto the ground. The failure occurred without warning. The vehicle was taken to a dealer, where it was diagnosed that the radiator cap and coolant bypass fitting had malfunctioned…”
filed Aug 10, 2015
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance…
SA-029-26 · Service Bulletin/Repair Instructions · issued Apr 21, 2026
Engine problems in other MAZDA6 years
| Year | Reports | Share |
|---|---|---|
| 2018 MAZDA6 | 32 | 55% |
| 2017 MAZDA6 | 4 | 7% |
| 2016 MAZDA6 | 7 | 9% |
| 2015 MAZDA6 | 4 | 7% |
| 2014 MAZDA6 | 15 | 11% |
| 2012 MAZDA6 | 2 | 2% |
| 2011 MAZDA6 | 3 | 2% |
| 2010 MAZDA6 | 4 | 2% |
| 2009 MAZDA6 | 11 | 3% |
| 2008 MAZDA6 | 2 | 2% |
| 2007 MAZDA6 | 9 | 6% |
| 2006 MAZDA6 | 10 | 6% |
Other reported problem areas on the 2003 Mazda MAZDA6
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.