The 2002 QX4 is a rebadged Nissan Pathfinder with upscale trim, sharing the same VG33E 3.3L V6 weaknesses. Timing belt maintenance is critical, but transmission cooler failures and valve cover gasket leaks dominate the shop ticket parade.
Radiator-Integrated Transmission Cooler Failure (Strawberry Milkshake of Death)
Common · high severity
Typical onset: 90,000-150,000 mi
Symptoms: Transmission fluid turns pink or milky, Coolant looks muddy or has oily film, Transmission slipping or delayed engagement after coolant/ATF cross-contamination, Check engine light with transmission-related codes
Fix: Replace radiator with aftermarket unit that has separate external trans cooler, flush transmission multiple times, pray internal damage hasn't occurred. If caught late, full transmission rebuild needed. 6-10 hours labor for radiator + cooler + flushes, add 12-18 hours if trans needs rebuild.
Estimated cost: $1,200-$1,800 radiator/cooler/flush only, $3,500-$5,500 if transmission damaged
Timing Belt and Water Pump Failure
Common · high severity
Typical onset: 90,000-110,000 mi
Symptoms: Engine won't start or runs extremely rough suddenly, Metallic rattling from front of engine, Coolant leak from water pump area, Overheating if water pump bearing fails
Fix: VG33E is an interference engine—skip the timing belt interval and you'll bend valves. Always do water pump, tensioner, and idler pulleys at same time. 6-8 hours labor. If belt snaps, add valve job or head work: 16-24 hours total.
Estimated cost: $800-$1,200 preventive maintenance, $2,800-$4,500 if valves bent
Valve Cover Gasket and Camshaft Seal Leaks
Common · low severity
Typical onset: 80,000-130,000 mi
Symptoms: Oil smell in cabin or under hood when hot, Oil dripping onto exhaust manifolds causing smoke, Visible oil weeping from valve cover edges, Low oil level between changes
Fix: Both valve covers leak, rear bank is harder to reach. Front cam seal often leaks too. Replace all gaskets, seals, and grommets together. 4-5 hours labor.
Estimated cost: $600-$900
Distributor Shaft Seal and Cap Leaks
Occasional · medium severity
Typical onset: 100,000-140,000 mi
Symptoms: Hard starting or no-start when wet or humid, Misfires under load, Oil dripping from distributor base, Intermittent stalling
Fix: O-ring at distributor base lets oil into cap, fouls internals. Replace distributor O-ring, cap, rotor, and wires as a set. 2-3 hours labor.
Estimated cost: $400-$650
Knock Sensor and Harness Failure
Common · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Check engine light with P0325 or P0328 codes, Loss of power and poor fuel economy, Engine pinging under load, Hesitation on acceleration
Fix: Knock sensor sits under intake plenum, wiring harness insulation degrades from heat. Must remove upper intake to access. Replace sensor AND harness. 3-4 hours labor.
Estimated cost: $500-$750
Front Lower Control Arm Bushings
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Clunking over bumps from front suspension, Steering wander or vague on-center feel, Uneven tire wear on inside edges, Alignment won't hold
Fix: Rubber bushings tear and separate. Replace both lower control arms as assemblies (bushings alone rarely available and labor-intensive to press). 3-4 hours labor plus alignment.
Estimated cost: $700-$1,100
Exhaust Manifold Cracks and Stud Failures
Occasional · low severity
Typical onset: 100,000-150,000 mi
Symptoms: Ticking or exhaust leak noise from engine bay, Smell of exhaust under hood, Noise louder when cold, may quiet down when warm, Failed emissions test
Fix: Manifolds crack near heat riser or studs break in head. Rear bank especially tight to work on. Aftermarket headers sometimes used. 6-9 hours labor if extracting broken studs.
Estimated cost: $800-$1,400
Owner tips
Install external transmission cooler BEFORE factory radiator fails—$150 in prevention saves $4,000 in transmission replacement
Do timing belt every 90k religiously, even if it looks fine—this is an interference engine
Check coolant and ATF condition every oil change for cross-contamination signs
Replace knock sensor harness preemptively if doing intake plenum work for any reason
Use Nissan OEM valve cover gaskets—aftermarket ones leak within 12 months
Solid truck if timing belt and cooling system maintained, but the transmission cooler issue is a $4k landmine—budget $2k in deferred maintenance on any used purchase.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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AIR BAGS:FRONTAL:DRIVER SIDE:INFLATOR MODULE · 22E066000
2022-08-09
Nissan North America, Inc. (Nissan) is recalling certain air bag inflator replacement service parts that may have been installed as part of a theft or collision repair. The parts include certain passenger-side air bag inflators designed to fit Infiniti 2002-2003 QX4, 2006-2010 M35 and M45; Nissan 2001-2003 Maxima, 2002-2006 Sentra, and both driver and passenger-side inflators designed to fit 2007-2012 Versa Sedan and Versa Hatchback vehicles. Please see Nissan's recall report for the specific part numbers. These replacement inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.
Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.
Remedy: Dealers will inspect and replace the inflators as necessary, free of charge. Owner notification letters are expected to be mailed September 14, 2022. Owners may contact Nissan's customer service at 1-800-867-7669.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE · 20V008000
2020-01-09 · EA15001
Nissan North America, Inc. (Nissan) is recalling certain 2001-2003 Maxima, 2002-2006 Sentra, 2002-2004 Pathfinder, 2007-2011 Versa Sedan and Versa Hatchback, 2001-2004 Infiniti I30 and I35, 2002-2003 Inifiniti QX4, 2003-2008 Infiniti FX35 and FX45 and 2006-2010 M35 and M45 vehicles. The vehicles are equipped with non-desiccated, frontal passenger air bag inflators containing phase stabilized ammonium nitrate (PSAN) propellant that were used as interim remedy parts for previous Takata recalls. These inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, high temperatures, and high temperature cycling.
Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.
Remedy: Nissan will notify owners, and dealers will replace the front passenger air bag inflators with alternate desiccated inflators, free of charge. The recall began February 12, 2020. Owners may contact Nissan customer service at 888-737-9511 or Infiniti customer service at 888-810-3715.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE · 17V068000
2017-02-02 · EA15001
Nissan North America, Inc. (Nissan) is recalling certain 2002 Pathfinder and Infiniti QX4 vehicles. These vehicles are equipped with Takata air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture.
Consequence: An inflator rupture may result in metal fragments striking the vehicle occupants resulting in serious injury or death.
Remedy: Nissan will notify owners, and dealers will replace the front passenger air bag assembly, free of charge. The recall began on March, 31, 2017. Owners may contact Nissan customer service at 1-800-647-7261.
AIR BAGS · 15V287000
2015-05-15 · EA15001
Nissan North America, Inc. (Nissan) is recalling certain model year 2001-2003 Nissan Maxima, 2002-2004 Pathfinder, 2002-2006 Sentra, 2002-2003 Infiniti QX4 and I35, 2003 FX35 and FX45, and 2001 I30 vehicles. Upon deployment of the passenger side frontal air bag, excessive internal pressure may cause the inflator to rupture.
Consequence: In the event of a crash necessitating deployment of the passenger's frontal air bag, the inflator could rupture with metal fragments striking the vehicle occupants potentially resulting in serious injury or death.
Remedy: Nissan will notify owners, and dealers will replace the passenger air bag inflator, free of charge. The recall began on June 15, 2015. Owners may contact Nissan customer service at 1-800-647-7261. Note: On December 18, 2015 Nissan informed NHTSA of an amendment of this recall to remove 2004-2005 Infiniti FX35 and FX45 vehicles.
STEERING:COLUMN · 11V244000
2011-04-20 · PE11004
NISSAN IS RECALLING CERTAIN MODEL YEAR 1996-2004 PATHFINDER AND MODEL YEAR 1997-2003 INFINITI QX4 VEHICLES ORIGINALLY SOLD, OR CURRENTLY REGISTERED IN, CONNECTICUT, DELAWARE, IOWA, ILLINOIS, INDIANA, MASSACHUSETTS, MAINE, MARYLAND, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WASHINGTON D.C., WEST VIRGINIA AND WISCONSIN. IN AREAS OF THE COUNTRY IN WHICH HEAVY CONCENTRATIONS OF ROAD SALT ARE USED, A MIXTURE OF SNOW/WATER AND SALT MAY ENTER AN ASSEMBLY LOCATION HOLE IN THE UPPER STRUT HOUSING, CAUSING WATER TO COLLECT AT THE MATING SURFACE OF THE STRUT HOUSING PANEL AND THE INNER HOOD LEDGE ASSEMBLY. OVER TIME, THIS
SNOW/WATER AND SALT INTRUSION MAY RESULT IN CORROSION OF THE STRUT TOWER HOUSING IN SOME SUBJECT VEHICLES.
Consequence: THE STRUT HOUSING MAY CRACK AND PULL AWAY FROM THE INNER HOOD LEDGE ASSEMBLY. THIS MAY LEAD TO GRINDING NOISES, INCREASED STEERING EFFORT, AND POSSIBLY THE STEERING COLUMN TO BREAK, RESULTING IN THE LOSS OF STEERING CONTROL, WHICH COULD RESULT IN A CRASH.
Remedy: NISSAN WILL INSPECT THE STRUT HOUSING AND REPAIR THE VEHICLES AS NECESSARY, FREE OF CHARGE. AN INTERIM NOTIFICATION LETTER WAS SENT OUT IN MAY 2011. THE SECOND NOTICE WAS MAILED ON JULY 25, 2011. OWNERS MAY CONTACT NISSAN AT 1-800-647-7261.
AIR BAGS:FRONTAL · 10V312000
2010-07-06
NISSAN IS RECALLING FORTY-SIX CERTAIN MODEL YEAR 2002 PATHFINDER AND INFINITI QX4 VEHICLES MANUFACTURED FROM AUGUST 24, 2001 THROUGH AUGUST 28, 2001. THE AIR BAG INFLATOR CONTAINS PROPELLANT WAFERS THAT ARE REQUIRED TO PROPERLY DEPLOY THE FRONT PASSENGER AIR BAG. DUE TO IMPROPER PROPELLANT WAFER INSTALLATION DURING THE AIR BAG INFLATOR ASSEMBLY PROCESS, SOME AIR BAG INFLATORS MAY BE MISSING ONE OF THE WAFERS. AS A RESULT, THE REMAINING WAFERS IN THE INFLATOR USED FOR THE DEPLOYMENT OF THE FRONT PASSENGER AIR BAG MAY, OVER TIME, BREAK UP INTO POWDER DUE TO NORMAL VIBRATION EXPERIENCED WHILE DRIVING. THIS CAUSES THE COMBUSTION RATE OF THE PROPELLANT TO INCREASE INSIDE THE INFLATOR, WHICH CAN LEAD TO INTERNAL PRESSURE RISING SUDDENLY DURING AIR BAG DEPLOYMENT.
Consequence: THE INFLATOR HOUSING MAY RUPTURE AND PIECES OF THE INFLATOR COULD STRIKE AND INJURE VEHICLE OCCUPANTS.
Remedy: NISSAN WILL NOTIFY THE OWNERS OF THE FORTY-SIX AFFECTED VEHICLES. DEALERS WILL REPLACE THE FRONT PASSENGER AIR BAG MODULE ASSEMBLY WITH A NEW ONE FREE OF CHARGE. THE SAFETY RECALL BEGAN ON AUGUST 19, 2010. OWNERS MAY CONTACT NISSAN AT 1-800-647-7261 AND INFINITI AT 1-800-662-6200.
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