There are 2 stored owner reports matching the fuel system leading-label group for the 2003 Mazda Protege in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 2 of 2 matching reports.
Open the full vehicle complaint log (all categories)YEAR 2003 MAZDA PROTEGE LX, GAS TANK LEAKING TO THE TRUNK. *TR
I HAVE HAD TWO OCCURRENCES OF SCREWS FROM THE BUTTERFLY VALVES ON THE VTCS SYSTEM FROM THE INTAKE OF MY 2003 MAZDA PROTEGE 5 COMING LOOSE AND BEING SUCKED INTO THE COMBUSTION CHAMBER OF THE VEHICLE. EACH INSTANCE HAS CAUSED THE PISTON TO KNOCK THE SCREW INTO THE SPARK PLUG, THEREBY CAUSING FAILURE OF A SPARK PLUG, WHICH CAUSES THE ENGINE TO MISFIRE TO THE POINT WHERE IT IS UNDRIVABLE, THEREBY LEAVING ME STRANDED ON THE SIDE OF THE ROAD. THE FIRST INCIDENT WAS MISDIAGNOSED (SPARK PLUG REPLACED). THE SECOND WAS DIAGNOSED CORRECTLY AND THE INTAKE MANIFOLD ASSEMBLY WAS REPLACED. THIS IS A WIDESPREAD PROBLEM WITH THE 2.0L FS-ZE MAZDA ENGINE. MANY OTHER OWNERS HAVE HAD THE PROBLEM. FOR MORE INFORMATION TO DEMONSTRATE THE PREVALENCE OF THE PROBLEM, PLEASE VISIT HTTP://WWW.MSPROTEGE.COM AND SEARCH USING THE KEYWORDS "VCTS" AND "SCREW". YOU WILL SEE MANY THREADS WHERE PEOPLE ARE DISCUSSING THIS PROBLEM. *NM
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.