The 2017 4Runner with the 4.0L V6 (1GR-FE) is generally rock-solid, but a small percentage suffer catastrophic secondary air injection failures that grenade the engine. Outside of that worst-case scenario, expect typical high-mileage transmission cooler line issues and minor accessory wear.
Secondary Air Injection Check Valve Failure Causing Engine Destruction
Rare · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Check engine light with P0441, P0446, or secondary air codes, Rattling noise from engine bay on cold start, Sudden catastrophic engine failure with metal shavings in oil, Total loss of compression in one or more cylinders
Fix: The secondary air injection check valve fails internally, allowing debris to enter combustion chambers and destroy pistons, rings, cylinder walls, and bearings. Prevention requires replacing valve around 60k mi ($200-400 job). Once engine damage occurs, only fix is full rebuild or replacement short block. Expect 30-40 hours labor for engine rebuild, or 20-25 hours for short block swap.
Estimated cost: $6,000-12,000
Transmission Oil Cooler Line Corrosion and Leaks
Common · medium severity
Typical onset: 80,000-140,000 mi
Symptoms: Pink or red fluid dripping near radiator or under transmission, Transmission running hotter than normal, Low transmission fluid level on dipstick, Burnt transmission fluid smell
Fix: Steel cooler lines rust through where they pass the frame or at crimp connections. Often both feed and return lines need replacement simultaneously. Replace with OEM or upgraded stainless lines. 2-3 hours labor plus fluid flush.
Estimated cost: $400-800
Rear Transmission Mount Deterioration
Occasional · low severity
Typical onset: 90,000-150,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration through floor at idle in gear, Excessive drivetrain movement visible during acceleration/deceleration
Fix: Rubber mount separates or tears, allowing excessive drivetrain movement. Requires supporting transmission and R&R mount. Factory mount typical, but polyurethane upgrades available. 1.5-2 hours labor.
Estimated cost: $250-450
Front Lower Ball Joint Wear
Common · medium severity
Typical onset: 100,000-160,000 mi
Symptoms: Clunking over bumps from front suspension, Loose or vague steering feel, Excessive play detectable during steering inspection, Uneven tire wear on inside edge
Fix: Lower ball joints wear out gradually. Some techs press new joints into existing arms (2 hours per side), but many replace entire lower control arms for reliability (1.5 hours per side). Always do alignment after. Both sides typically need service at same time.
Estimated cost: $600-1,200
Exhaust Manifold Heat Shield Rattle
Occasional · low severity
Typical onset: 70,000-130,000 mi
Symptoms: Metallic rattling from engine bay during acceleration or deceleration, Noise disappears when engine fully warmed up, Sound intensifies over rough roads
Fix: Heat shield tabs break or bolts loosen due to thermal cycling. Can often be fixed by removing shield entirely (no safety issue) or re-securing with high-temp hardware. 0.5-1 hour labor.
Estimated cost: $80-200
Tailgate Lock Actuator Failure
Occasional · low severity
Symptoms: Tailgate won't unlock with key fob or interior button, Manual key still operates lock, Clicking sound from tailgate when attempting to unlock
Fix: Plastic gears inside actuator strip or motor fails. Requires removing interior tailgate panel and replacing actuator assembly. 1-1.5 hours labor.
Estimated cost: $300-500
Owner tips
Replace secondary air injection check valve preventively at 60k-70k miles — cheap insurance against $10k engine rebuild
Inspect transmission cooler lines annually in rust-belt states; catch leaks before transmission gets damaged
Use Toyota WS fluid only for transmission — aftermarket 'equivalent' fluids cause shifting issues in A750F/E transmissions
Check ball joints every 20k miles once past 80k — catching them early prevents tire wear and alignment problems
Buy with confidence if secondary air valve has been addressed and no engine rebuild history shows up — otherwise a supremely reliable platform that'll hit 300k with basic maintenance.
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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Southeast Toyota Distributors, LLC (SET) is recalling certain 2017-2019 Toyota 4Runner vehicles that SET modified to be equipped with a TRD wheel package. The Gross Vehicle Weight Rating (GVWR) on the certification label may be incorrect, possibly resulting in the vehicle being overloaded. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 110, "Tire Selection and Rims."
Consequence: An overloaded vehicle can increase the risk of a crash.
Remedy: SET will notify owners and mail them corrected certification labels, free of charge. The recall began November 28, 2018. Owners may contact SET customer service at 1-866-405-4226. SET's number for this recall is SET18A.
EQUIPMENT:OTHER:LABELS · 17V831000
2017-12-20
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2017-2018 Toyota 4Runner and Tundra, 2018 Toyota Highlander, RAV4 and Lexus GX460 and 2017 Toyota Sienna and Tacoma vehicles. These vehicles may have incorrect load carrying capacity modification labels. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 110, "Tire Selection and Rims."
Consequence: An incorrect load information label can result in the operator overloading the vehicle and increasing the risk of a crash.
Remedy: Toyota will notify owners and provide them with corrected labels, free of charge. The recall began on January 23, 2018. Owners may contact Toyota customer service at 1-800-331-4331. Toyota's numbers for this recall are H0Z for Toyota vehicles, and HLF for Lexus vehicles.
STRUCTURE:BODY:HOOD · 17V763000
2017-11-29
Southeast Toyota Distributors, LLC (SET) is recalling certain 2015-2018 Toyota 4Runner vehicles equipped with an accessory Billet Grille Overlay installed by SET or provided by SET and installed by SET dealers. The U-nut that secures the overlay grille may fracture, allowing the Billet Grille Overlay to detach from the vehicle.
Consequence: If the Billet Grille Overlay detaches while driving, it can become a road hazard, increasing the risk of a crash.
Remedy: SET will notify owners, and dealers will replace the securing U-nuts with upgraded hardware, free of charge. The recall is expected to begin January 26, 2018. Owners may contact SET customer service at 1-866-405-4226. SET's number for this recall is SET17C.
TIRES:TEMPORARY/EMERGENCY SPARE TIRE · 17V295000
2017-05-02
Gulf States Toyota, Inc. (Gulf States) is recalling certain 2017 4Runner , 86, Avalon, Camry, Camry Hybrid, Corolla, Corolla iM, Highlander, Highlander Hybrid, Prius, Prius C, RAV4, RAV4 Hybrid, Sienna and Yaris vehicles. The spare tire air pressure was not adjusted to the proper pressure as stated on the Tire Pressure Label.
Consequence: A spare tire that is not inflated to the proper value may not perform as intended, increasing the risk of a crash.
Remedy: Gulf States will notify owners, and dealers will inspect the spare tires, adjusting their pressure as necessary, free of charge. The recall began June 15, 2017. Owners may contact Gulf States customer service at 1-800-444-1074. Toyota's number for this recall is 17R2.
EQUIPMENT · 17V291000
2017-05-01
Gulf States Toyota, Inc (Gulf States) is recalling certain 2016-2017 4Runner vehicles equipped with the TFORCE accessory package. The fasteners for the aftermarket roof rack may have been improperly tightened.
Consequence: If the roof rack fasteners loosen, the roof rack may detach from the vehicle, increasing the risk of a crash.
Remedy: Gulf States will notify owners, and dealers will inspect and, as necessary, tighten the roof rack fasteners, free of charge. The recall began June 15, 2017. Owners may contact Gulf States customer service at 1-800-444-1074. Gulf States' number for this recall is 17R1.
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