NHTSA lists 2 safety recalls and 131 owner complaints for the 2003 Infiniti M45. Most complaints involve fuel system, gasoline (66) and engine (23). The EPA rates it 18 mpg combined.
NISSAN IS RECALLING CERTAIN MODEL YEAR 2003-2004 INFINITI M45 VEHICLES MANUFACTURED FROM MARCH 7, 2002, THROUGH JUNE 3, 2004. DUE TO A CIRCUIT BOARD FAILURE, THE FUEL GAUGE MAY READ A FUEL LEVEL HIGHER THAN ACTUALLY EXISTS. AS A RESULT, THE VEHICLE MAY RUN OUT OF GAS WITHOUT NOTICE.
ON CERTAIN PASSENGER VEHICLES, THE CIRCUIT BOARD FOR THE CRANK POSITION SENSOR OR CAM POSITION SENSOR MAY HAVE AN IMPROPER SOLDER JOINT DUE TO SOLDER DEFORMATION CAUSED BY HEAT STRESS ACCELERATED BY THE EXISTENCE OF FLUX RESIDUE DURING THE SOLDERING PROCESS.
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
“The contact owns a 2003 Infiniti M45. The contact stated that on several occasions while driving at various speeds, the fuel gauge failed to read the fuel level correctly and the vehicle stalled. The vehicle was towed several times to a dealer and independent mechanic however, the fuel gauge sensor could not be replaced. Additionally, on one occasion, the vehicle was steered to the side of the road where the vehicle was refueled. The vehicle was restarted but the failure persisted. The vehicle was then taken to a dealer where it was diagnosed that the fuel filter needed to be replaced and the fuel gauge sensor needed to be cleaned. The vehicle was repaired but the failure reoccurred. The manufacturer was not notified of the failure. The failure mileage was approximately 160,000.”
“2003 INFINITI M45 WITH APPROXIMATELY 106,000 MILES. CAR WILL STALL SUDDENLY AT HIGHWAY OR CITY ROAD SPEEDS NECESSITATING PUTTING CAR INTO NEUTRAL OR PULLING OVER TO RESTART. PREVIOUSLY, AFTER THIS HAD HAPPENED, A CODE FOR FAULTY CRANKSHAFT POSITION SENSOR WAS RECOVERED, AND BOTH THE CRANKSHAFT AND CAMSHAFT POSITION SENSORS WERE REPLACED WITH AFTERMARKET NEW PARTS FROM DURALAST. CAR NO LONGER HAS A CHECK ENGINE LIGHT CODE ASSOCIATED WITH THE STALLING, BUT THE STALLING PERSISTS. ALSO, WHEN CAR IS COOLED TO AMBIENT TEMPERATURE, IT MAY TAKE 2-3 IGNITION ATTEMPTS TO START THE CAR AND OCCASIONALLY A BACKFIRE/MISFIRE IS HEARD DURING FAILED ATTEMPTS. IF CAR HAS SAT FOR MULTIPLE DAYS WITHOUT BEING DRIVEN, IT MAY TAKE 10-15 ATTEMPTS TO START THE VEHICLE.”
“WHILE I WAS DRIVING THIS VEHICLE, IT HAD SHUT OFF WHILE I WAS DRIVING AND I LOST ALL POWER. IT STARTED BACK UP LIKE NORMAL. THIS HAS HAPPENED TWICE AND I'M AFRAID THIS COULD HAPPEN WHILE I'M ON THE HIGHWAY WITH MY FAMILY. I SEE THERE WAS A RECALL INVOLVING THIS BUT NOT FOR MY VEHICLE. THIS HAS HAPPENED TO ME JUST RECENTLY.”
Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.
| Version | City | Hwy | Comb. | Fuel / yr | CO₂ g/mi |
|---|---|---|---|---|---|
| M45 Auto (S5), 8 cyl, 4.5 L · Rear-Wheel Drive | 16 | 22 | 18 | $4,400 | 494 |
| Item | Miles | Time | Note |
|---|---|---|---|
| Engine oil & filter | 5,000–10,000 mi | 6–12 months | Follow the oil-life monitor if fitted |
| Tire rotation | 5,000–7,500 mi | Every oil change | Check pressure monthly |
| Engine air filter | 15,000–30,000 mi | 1–2 years | Sooner in dusty areas |
| Cabin air filter | 15,000–25,000 mi | 1–2 years | |
| Brake fluid | — | 2–3 years | Absorbs moisture over time |
| Coolant | 60,000–100,000 mi | 5–10 years | Long-life coolants last longer |
| Spark plugs | 60,000–100,000 mi | — | Iridium/platinum plugs at the long end |
| 12V battery | — | 3–5 years | Heat shortens battery life |
2 safety recalls as of Oct 28, 2026, according to NHTSA. Recall repairs are free at a dealer. Check your VIN to see whether your car is included and whether the repair was done.
Owners filed 131 complaints with NHTSA. The most-cited components are fuel system, gasoline (66), engine (23), electrical system (22). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.
The EPA rates the 2003 Infiniti M45 at 18 mpg combined, depending on engine and drivetrain (1 version rated).