2008 Toyota Highlander engine problems

Rubber hose section of the engine oil cooler line bursts or ruptures, dumping engine oil rapidly—typically 4–6 quarts in minutes—onto the undercarriage, roadway, and hot exhaust components. Occurs on vehicles equipped with 2GR-FE/FXE V6 engines, often with towing packages.

When: Failures reported at mileages ranging from 64,000 to 200,000 miles; some occur immediately after recent oil-change service with no visible leak noted.

Symptoms owners cite: Burning or hot oil smell in cabin or engine compartment; Smoke from under hood or engine area; Low oil pressure warning light (often delayed or only triggered after significant oil loss); Audible engine noise, knocking, or tapping (from oil starvation); Oil pooling under vehicle or coating undercarriage, exhaust, spare tire, wheel wells, rear liftgate; Oil slick left on roadway for 1+ mile; Complete or near-zero dipstick reading after discovery

Codes mentioned: Low oil pressure warning, Check engine light (in some cases), VSC (Vehicle Stability Control) warning (in some cases)

Repairs/costs cited: Replacement of rubber hose with metal tube assembly (part 04004-29131 or equivalent); cost approximately $437–$480 for parts and labor. If oil starvation damages engine, full short-block or engine replacement cost $7,000–$8,300.

Recalls/TSBs owners mention: Toyota Technical Service Bulletin T-SB-0201-11 issued December 2011 addressing 'oil seepage' from oil cooler pipes. Toyota Warranty Enhancement Program ZE2 offered extended coverage (10 years or 150,000 miles from first use) but only for repairs completed between mid-2014 and January 2016. Toyota claims warranty notices were mailed 'for several months' after late July 2014, but many owners report never receiving notification. Dealerships cite the warranty program as a condition for coverage only within the stated time/mileage limits; repairs outside that window are owner responsibility. One case involved replacement of the hose under recall (2011), but a second rupture in 2013 was denied coverage.

Failure of the intake camshaft gear, detected by a rattling or clicking noise from the engine area. Requires replacement of multiple cam gears and both camshafts due to incompatibility of updated parts with existing hardware.

When: Reported at approximately 33,800–100,000 miles; noise often occurs after vehicle sits for hours following warm operation.

Symptoms owners cite: Intermittent rattling or clicking sound from engine area (lasts < 2 seconds); Sound typically triggered after vehicle sits following warm-up cycle

Codes mentioned: Toyota Technical Service Bulletin 0094-09 references this failure

Repairs/costs cited: Replacement of all four cam gears and two camshafts required; one owner quoted $6,233 (parts $3,748, labor $2,137, tax $348). Toyota corporate offered 50% parts cost assistance on one case but denied full coverage, citing the incompatibility of the updated gear design.

Recalls/TSBs owners mention: Toyota Technical Service Bulletin 0094-09 published; Toyota corporate provided 50% parts-cost assistance on at least one case but did not offer full warranty coverage for the repair.

Faulty valve spring (typically on a single cylinder) breaks and falls into the cylinder, destroying the piston and severely damaging the short block and cylinder head. Results in sudden, unwarned engine stall while driving.

When: Reported at approximately 100,000 miles on a 2008 model; Toyota recalled the same 3.5L V6 in certain 2006–2008 Lexus models for an identical issue but did not extend the recall to 2008 Highlander.

Symptoms owners cite: Sudden engine stall without warning while driving at highway speed (65 mph); Check engine light (if any indication appeared)

Codes mentioned: Related to Lexus valve spring recall affecting same 3.5L V6 engine

Repairs/costs cited: Complete short-block replacement, front head, exhaust cam, valve, and spring; one owner paid approximately $6,000. Repair required removal of transmission and extensive disassembly.

Recalls/TSBs owners mention: Toyota declined assistance, citing that the valve spring issue recall was limited to Lexus models and not extended to Highlander. Toyota refused to disclose the valve spring manufacturer or confirm whether the same component was used in recalled Lexus models.

Engine consumes or burns 2+ quarts of oil between regular service intervals despite vehicle being well-maintained per manufacturer schedule.

When: Reported at 135,000 miles; owner indicates the problem developed gradually over time.

Symptoms owners cite: Low oil level on dipstick between scheduled oil changes; Requirement to carry extra oil quarts in vehicle

Repairs/costs cited: No repair documented; dealership performed oil test and stated consumption was within normal limits for vehicle age/mileage. Owner disputes this conclusion.

Recalls/TSBs owners mention: Dealership advised that oil consumption is normal for a vehicle with 135,000 miles and maintained per schedule; no further action taken.

Water pump fails, requiring replacement. Owners report this as a recurring issue across multiple Toyota models they have owned.

When: Reported at approximately 135,000+ miles (one case) and in a separate case at an unspecified higher mileage after returning from airport parking.

Symptoms owners cite: Loud or grinding noise from front of engine hood (audible at low speeds, not at highway speeds); Squishing noise from front of hood

Repairs/costs cited: One case quoted approximately $650 for replacement and parts. Not covered under powertrain warranty.

Recalls/TSBs owners mention: Toyota warranty does not cover water pump as it is not classified as part of the powertrain.

Rupture of the rear-bank VVT-i oil line (metal tube with rubber hose connection), causing rapid oil drain. Similar in mechanism to the main oil cooler line failure but a separate component; one owner reports this part has been recalled on 1.6 million RAV4, Camry, and other models but not on Highlander.

When: Reported at various mileages; one narrative indicates the same defect has been recalled on other Toyota/Lexus models but not universally applied.

Symptoms owners cite: Complete loss of oil in minutes; Oil spray onto wheel, brakes, and engine bay; Potential fire hazard

Repairs/costs cited: Replacement with metal tube and hose assembly.

Recalls/TSBs owners mention: Toyota refused to acknowledge this as a safety defect on Highlander despite issuing recalls for the same component on RAV4 and Camry models.

Vehicle stalls or loses power unexpectedly during normal driving, sometimes while stopped at a light or while making turns. One case involved complete engine shutdown requiring tow; another involved hybrid system failure with abrupt loss of power. Causes vary: transmission dropout from broken axle, hybrid system inverter, or undiagnosed lower-end motor failure.

When: Reported at various mileages (29,850; 55 mph during normal driving; 12,000 miles; 119,000 miles on hybrid model).

Symptoms owners cite: Vehicle stalls or dies without warning; Check engine light or VSC light illumination (sometimes before, sometimes after); Unable to restart or move forward/reverse; Abrupt loss of power while accelerating; For hybrid: 'Check Hybrid System' warning light with abrupt power loss

Codes mentioned: VSC (Vehicle Stability Control) warning, Check engine light

Repairs/costs cited: One case involved replacement of driver-side axle, transmission inspection, and camshaft position sensor (12,000 miles). Hybrid case still under diagnosis at time of complaint.

Recalls/TSBs owners mention: Dealerships diagnosed but in some cases could not determine root cause or offered no warranty assistance.

Engine on cylinder 4 misfires continuously; vehicle burns coolant but does not overheat. Four independent shops unable to identify cause despite inspection of head gasket, fuel injectors, ignition parts, compression, and cooling system.

When: Timing not specified; ongoing issue.

Symptoms owners cite: Persistent misfire on cylinder 4; Coolant consumption without overheating; No water in oil, exhaust, or cooling system detected

Repairs/costs cited: Head gasket replacement and fuel injector/ignition replacement did not resolve issue. Possible ECU reflash or replacement suggested but not yet attempted.

Recalls/TSBs owners mention: No manufacturer involvement reported.