The 2002 Highlander is generally solid for a first-gen Toyota crossover, but the 3.0L V6 has a well-documented oil consumption/sludge problem that can kill engines if neglected. Transmissions are typically durable, though cooler lines and mounts wear with age.
3.0L V6 Oil Sludge and Excessive Oil Consumption
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Blue smoke from exhaust on startup or acceleration, Oil level drops 1+ quart between changes, Check engine light with misfire codes, Rough idle and poor acceleration, Catastrophic engine failure if oil level drops too low
Fix: This is the killer issue on the 3.0L 1MZ-FE. Poor PCV design and marginal oil passages lead to sludge buildup and eventually scored cylinder walls. Catch it early, you're looking at valve cover cleaning and strict 3,000-mile oil change intervals with high-quality synthetic. Miss it, and you're into piston ring replacement (16-20 hours) or full engine rebuild/replacement (20-28 hours). Many owners just swap in a used engine.
Estimated cost: $3,500-7,500
Transmission Oil Cooler Line Leaks
Common · medium severity
Typical onset: 100,000-180,000 mi
Symptoms: Pink or red fluid spots under vehicle, Transmission fluid level drops gradually, Burnt transmission smell if fluid runs low, Transmission slipping or delayed engagement if severe
Fix: The steel cooler lines that run to the radiator rust through at the bends and mounting brackets, especially in salt states. Lines themselves are cheap, but you're looking at 2-3 hours labor to replace both lines, flush the system, and refill. Do NOT ignore this—low trans fluid will grenade the U140/U140F transmission.
Estimated cost: $300-600
Transmission Mount Failure
Occasional · medium severity
Typical onset: 120,000-200,000 mi
Symptoms: Clunking or banging when shifting from Park to Drive/Reverse, Excessive vibration at idle, Visible sagging of transmission when engine is running, Harsh engagement into gear
Fix: The rear transmission mount (and sometimes engine mounts) deteriorate and the rubber separates from the metal bracket. Front-wheel-drive bias means the trans torques hard on shifts. Replace the trans mount (1.5-2 hours), and inspect engine mounts while you're under there. Often all three need doing at once on high-mileage examples.
Estimated cost: $250-500
Rear Liftgate Latch Failure
Occasional · low severity
Symptoms: Liftgate won't latch or stay closed, Have to slam it multiple times to engage, Rattling from rear while driving, Warning light on dash about open liftgate
Fix: The plastic latch mechanism wears out or the striker plate bends from repeated slamming. There was a recall (01V370000) but many vehicles still have the old parts. Replacement latch assembly runs about 1 hour labor. Sometimes adjusting the striker fixes it temporarily, but the latch itself usually needs replacing.
Estimated cost: $150-300
Lower Ball Joint Wear
Common · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Clunking noise over bumps from front end, Wandering or loose steering feel, Uneven tire wear on inner edges, Vehicle pulls to one side, Visible play when prying on suspension
Fix: The lower ball joints wear out and develop slop, especially if driven in harsh conditions. On this platform, the ball joint is pressed into the lower control arm, so most shops replace the entire control arm assembly (1.5 hours per side). Do an alignment immediately after. This is a safety item—don't defer it.
Estimated cost: $400-700
Starter Motor Failure
Occasional · medium severity
Typical onset: 120,000-180,000 mi
Symptoms: Click-click-click when turning key with no crank, Intermittent no-start, works after multiple attempts, Grinding noise during cranking, Car starts fine when cold, fails when heat-soaked
Fix: The Denso starter develops worn brushes or a bad solenoid. On the V6, it's accessible from underneath in about 1.5-2 hours. The 4-cylinder is easier. Rebuilt starters are cheap and reliable. Heat from the exhaust manifold accelerates failure, so this is more common in hot climates.
Estimated cost: $300-550
Owner tips
If you have the 3.0L V6, religiously change oil every 3,000-4,000 miles with a quality synthetic—this engine will NOT tolerate 5,000+ mile intervals.
Inspect transmission cooler lines annually if you're in the rust belt; replacing them before they leak is a $200 job versus a $3,000 transmission.
Check engine oil level every fill-up after 100,000 miles—early catch of oil consumption can save the motor.
Replace transmission fluid every 50,000 miles with Toyota Type T-IV (now WS)—this transmission does not have a lifetime fill despite what the manual says.
Solid buy if it's the 2.4L four-cylinder or a 3.0L V6 with documented frequent oil changes and no smoking; walk away from any high-mileage V6 that burns oil or has sketchy service records.
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.
Fitment notes: Standard Toyota battery size for 4-cylinder models
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Every control module on the 2001-2003 Toyota Highlander — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
ABS Actuator (ABS)2.5 hr R&Rrelearn only +0.2 hr▸ programming details
⚠️ Optional equipment; sensor calibration may be required
Audio System (AUDIO)0.6 hr R&Rrelearn only +0.1 hr▸ programming details
📍 Dashboard, center stack radio cavity
🔧 Radio security code entry
⚠️ Anti-theft code required; customer must provide code or retrieve from dealer
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
CERTAIN SPORT UTILITY VEHICLES HAVE A CHILD PROTECTION LOCK (CPL) SYSTEM ON BOTH OF THE REAR SIDE DOORS. WHEN AN OPERATOR OF THE VEHICLE CLOSES THE DOOR VERY HARD WITH THE CPL LEVER SET TO THE LOCK POSITION, THERE IS A POSSIBILITY THAT THE LEVER MAY CONTACT THE BODY PANEL, CAUSING THE CPL LEVER TO MOVE INTO THE UNLOCK POSITION.
Consequence: THIS CONDITION COULD ALLOW THE DOOR TO BE OPENED WITH THE INSIDE WHILE THE OPERATOR BELIEVES THAT THE CPL WAS ACTIVATED. IF THE DOOR WERE OPENED FROM THE INSIDE WHILE THE VEHICLE WAS IN MOTION, AN OCCUPANT COULD FALL OUT AND BE INJURED.
Remedy: DEALERS WILL SHORTEN THE CPL LEVER. OWNER NOTIFICATION BEGAN MAY 7, 2004. OWNERS SHOULD CONTACT TOYOTA AT 1-800-331-4331.
ON SPORT UTILITY VEHICLES, THERE IS A BREATHER HOSE THAT ATTACHES TO THE NOZZLE OF THE ON-BOARD REFUELING VAPOR RECOVERY (ORVR) VALVE, WHICH IS LOCATED ON THE TOPSIDE OF THE FUEL TANK. THE BREATHER HOSE IS ATTACHED WITH A CLAMP, WHOSE "TABS" FACE IN THE UPWARD DIRECTION. WHEN THE VEHICLE WAS CRASHED UNDER THE NEW CAR ASSESSMENT PROGRAM (NCAP) TEST (I.E., 35 MPH FRONTAL BARRIER CRASH), THE CLAMP "TABS" CONTACTED THE UNDERSIDE OF THE BODY DUE TO MOVEMENT OF THE FUEL TANK, CAUSING THE NOZZLE TO BREAK.
Consequence: IN THE WORST CASE, NOZZLE BREAKAGE COULD RESULT IN FUEL LEAKAGE IF THE VEHICLE ROLLS-OVER AFTER A HIGH SPEED FRONTAL CRASH.
Remedy: DEALERS WILL ROTATE THE SPECIFIED CLAMP. OWNER NOTIFICATION BEGAN SEPTEMBER 23, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT TOYOTA AT 1-800-331-4331.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2002 Toyota Highlander 2.4L I4 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.