NHTSA lists 3 safety recalls and 12 owner complaints for the 1997 Infiniti Q45. Most complaints involve electrical system (4) and air bags (2). The EPA rates it 18 mpg combined.
ON CERTAIN PASSENGER VEHICLES, ONE OF THE DIODES USED IN THE ALTERNATOR MAY HAVE BEEN DAMAGED WHEN BUILT. THIS CAN EVENTUALLY RESULT IN FAILURE OF THE DIODE AND AN ELECTRICAL SHORT WHICH COULD MELT THE PLASTIC HOUSING.
VEHICLE DESCRIPTION: PASSENGER VEHICLES. ONE OF THE DIODES USED IN THE ALTERNATOR MAY HAVE BEEN DAMAGED WHEN BUILT. THIS CAN EVENTUALLY RESULT IN FAILURE OF THE DIODE AND AN ELECTRICAL SHORT WHICH COULD MELT THE PLASTIC HOUSING.
VEHICLE DESRIPTION: PASSENGER VEHICLES. THE IGNITION KEY CAN BE REMOVED WHEN THE ENGINE IS TURNED OFF WITHOUT PLACING THE TRANSMISSION SHIFT LEVER IN THE "PARK" POSITION. THIS DOES NOT COMPLY WITH THE REQUIREMENTS OF FMVSS NO. 102, "TRANSMISSION SHIFT LEVER SEQUENCE, STARTER INTERLOCK, AND TRANSMISSION BRAKING EFFECT."
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
“SOMETIME AFTER I PURCHASING THE ABOVE VEHICLE IN NOVEMBER, 2001, THE ENGINE WOULD FAIL TO START WITHOUT RECHARGING THE BATTERY. AFTER RECHARGING, THE VEHICLE WOULD EXHIBIT NO MALFUNCTION AND OPERATE NORMALLY FOR EXTENDED PERIODS OF TIME. THIS CONDITION WOULD REOCCUR INFREQUENTLY, AND HAS SINCE MANIFESTED ITSELF BY SHOWING NO CHARGING FROM THE ALTERNATOR. INFINITI IDENTIFIED THIS PROBLEM WITH A RECALL BEGUN ON 03/15/2002, AS A DEFECTIVE DIODE DAMAGED IN MANUFACTURE. THIS ACTION IS IDENTIFIED AS NHTSA ACTION # PE02034. AT NO TIME WAS I NOTIFIED BY INFINITI OF THIS RECALL, AND THE SYMPTOMS OF MALFUNCTION I HAVE EXPERIENCED ARE CLEARLY A RESULT OF A DEFECTIVE ALTERNATOR/DIODE. I CONTACTED INFINITI ON 11/08/2011 AND THEY DENIED ME ANY ASSISTANCE. I REQUEST YOUR ASSISTANCE IN REQUIRING INFINITI TO CORRECT THIS MALFUNCTION WHICH WOULD HAVE BEEN AVOIDED HAD INFINITI NOTIFIED ME DURING THE RECALL PERIOD. MY OWNERSHIP OF THE VEHICLE WAS A MATTER OF PUBLIC RECORD AND COULD HAVE EASILY BEEN OBTAINED. *TR”
“TL* THE CONTACT OWNS A 1997 INFINITI Q45. THE CONTACT STATED THAT WHILE ATTEMPTING TO START THE VEHICLE, THE FRONT DRIVER AND PASSENGER SIDE AIR BAGS DEPLOYED INADVERTENTLY. THE VEHICLE IMMEDIATELY BECAME FULL OF SMOKE AS THE DRIVER AND FRONT PASSENGER EXITED THE VEHICLE. THERE WERE NO INJURIES. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 140,000. THE VIN WAS NOT AVAILABLE.”
“THE VEHICLE HAS CONTINUALLY EXPERIENCED SEVERE VIBRATION IN THE FRONT END SUSPENSION WHILE DRIVING 40 TO 60 MPH, THE TIRES HAVE BEEN REPLACED DUE TO UNEVEN SEVERE WEAR OF THE INSIDE OF TIRES (NO MAKE/MODEL OF TIRE PROVIDED), ONE TIRE BLEW OUT DUE TO VIBRATION PROBLEMS. CONSUMER REPLACED TWO SETS OF TIRES IN 39000 MILES. *MJS”
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 |
|---|---|---|---|---|---|
| Q45 Auto 4-spd, 8 cyl, 4.1 L · Rear-Wheel Drive | 16 | 22 | 18 | $4,200 | 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 |
3 safety recalls as of Nov 12, 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 12 complaints with NHTSA. The most-cited components are electrical system (4), air bags (2), suspension (2). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.
The EPA rates the 1997 Infiniti Q45 at 18 mpg combined, depending on engine and drivetrain (1 version rated).