The 2018 4Runner with the 4.0L V6 (1GR-FE) is generally bulletproof, but this generation suffers from a notorious secondary air injection system failure and transmission fluid cooler leaks. The extensive engine rebuild documentation in the database is unusual and bears watching.
Secondary Air Injection Pump Failure
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Check engine light with P0410/P0418/P0419 codes, Rattling noise on cold start for 30-60 seconds, Failed emissions testing in some states
Fix: Replace air injection pump and often the one-way valves in both cylinder heads. 3-4 hours labor if just the pump, 6-8 hours if valves are also seized (common). Many techs delete the system entirely where emissions allow.
Estimated cost: $800-2,200
Transmission Oil Cooler Line Leaks
Common · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Pink or red fluid dripping near radiator, Transmission running hot, Low transmission fluid level, Potential for coolant contamination into transmission
Fix: Replace transmission cooler lines and often the entire cooler assembly inside the radiator. If coolant mixed with ATF, full transmission flush required. 2-3 hours for lines only, 4-5 hours if radiator replacement needed.
Estimated cost: $600-1,800
Exhaust Manifold Cracking and Leaks
Occasional · medium severity
Typical onset: 90,000-150,000 mi
Symptoms: Ticking or hissing from engine bay on cold start, Exhaust smell in cabin, Failed emissions test, Visual cracks on manifold near cylinder head
Fix: Replace affected exhaust manifold(s) and all studs/gaskets. Both sides often need doing eventually. 5-7 hours per side due to tight clearances. OEM manifolds are better than aftermarket.
Estimated cost: $1,200-2,000
Front Lower Ball Joint Wear
Common · high severity
Typical onset: 70,000-110,000 mi
Symptoms: Clunking over bumps, Wandering or loose steering feel, Excessive play during suspension inspection, Uneven tire wear on inside edge
Fix: Replace lower control arms (ball joints are not serviceable separately on this generation). Both sides typically done together. 3-4 hours labor, requires alignment afterward.
Estimated cost: $800-1,400
Running Board Motor and Bracket Failure
Occasional · low severity
Symptoms: Running boards won't deploy or retract, Grinding noise when operating, Boards stuck in one position, Corrosion on mounting brackets in salt states
Fix: Replace motor assembly or entire running board mechanism if brackets are corroded. 2-3 hours per side. Many owners just disconnect them and leave in down position.
Estimated cost: $600-1,200
Rear Differential Pinion Seal Leak
Occasional · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Gear oil dripping from center of rear diff, Low differential fluid level, Whining noise from rear end if run too low
Fix: Replace pinion seal and crush sleeve, requires diff disassembly and preload setup. 3-4 hours labor. Use OEM seal only.
Estimated cost: $500-900
Unusual Engine Rebuild Pattern (Database Anomaly)
Rare · high severity
Typical onset: varies widely
Symptoms: Catastrophic engine failure, Rod knock, Severe oil consumption, Metal shavings in oil
Fix: The frequency of piston, bearing, and full engine rebuild jobs in your database is highly unusual for the 1GR-FE, which is typically a 300k+ mile engine. Suggests either severe neglect, persistent overheating, or aftermarket modifications. Full rebuild or reman engine 20-30 hours labor.
Estimated cost: $8,000-15,000
Owner tips
Change transmission fluid every 50k miles despite Toyota's 'lifetime fill' claim — prevents cooler line issues and extends transmission life
Inspect secondary air injection system during every oil change after 50k miles; early pump replacement saves the valves
Use OEM red ATF WS fluid only — aftermarket equivalents cause shuddering in the A750F transmission
Check ball joints every tire rotation; these wear faster than previous 4Runner generations
If engine rebuild jobs in your area are common, investigate local fuel quality or pattern of owner neglect before purchasing used
Strong buy if maintained, but verify transmission service history, check for air pump codes, and inspect ball joints carefully — the engine rebuild pattern in your data is a red flag worth investigating regionally.
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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Consequence: If the fuel pump fails, the engine can stall while driving, increasing the risk of a crash.
Remedy: Toyota will notify owners, and dealers will replace the fuel pump assembly with an improved one, free of charge. Owners of specific models were notified that remedy parts were available starting January 21, 2021. Owners of other models will be notified as remedy parts become available. Remedy parts should be available for all affected vehicles by late March 2021. Owners may contact Toyota customer service at 1-888-270-9371 or Lexus customer service at 1-800-255-3987. Note: This recall is an expansion of recall 20V-012. Toyota's number for this recall is 20TA02. Lexus' number for this recall is 20LA01.
STEERING · 19V670000
2019-09-20
Southeast Toyota Distributors, LLC (SET) is recalling certain 2018-2019 Toyota 4Runner vehicles. During installation, certain steering and suspension components may not have been properly tightened.
Consequence: Loose fasteners may cause a loss of vehicle control, or cause an accessory to detach from the vehicle and become a road hazard. Either of these scenarios can increase the risk of a crash or injury.
Remedy: SET will notify owners, and dealers will inspect and re-tighten the steering and suspension fasteners as necessary, free of charge. The recall is expected to begin November 19, 2019. Owners may contact SET customer service at 1-866-405-4226. SET's number for this recall is SET19B.
EQUIPMENT:OTHER:LABELS · 18V753000
2018-10-25
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.
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