What is the most common problem with the Toyota 4Runner?

The most commonly reported problem is frame rust and corrosion on older 4Runners, particularly those that have lived in regions that use road salt. Other frequent concerns include oil leaks or consumption in some engines, plus various drivetrain or 4WD-related wear as vehicles age.

While the 4Runner is widely praised for durability and off-road capability, problems tend to surface with age and mileage. This article reviews the top issues that show up in owner reports and service data, and offers guidance on prevention and maintenance across generations.

Most frequently cited problems in practice

The following list captures the issues that owners and service data most often point to as the primary trouble spots for the Toyota 4Runner. It focuses on common, repeatable failure modes rather than isolated incidents.

• Frame rust and corrosion, especially on older models and vehicles in snowy, salted-road regions


• Oil leaks from valve covers and rear main seals, which can lead to more significant engine trouble if ignored


• Oil consumption in some 4.0L V6 (1GR-FE) engines, particularly as mileage climbs


• Drivetrain wear affecting 4WD components, including transfer case and differential issues


• Suspension and steering wear (bushings, ball joints, tie rods) that can affect ride quality and handling

These issues vary by year, climate, and maintenance history. Early and high-mileage examples are more prone to frame-related concerns, while later models tend to show more leaks and drivetrain wear as routine maintenance items.

Generation-by-generation snapshot

Third generation (1996–2002)

In this generation, frame rust and underbody corrosion were frequently reported in vehicles driven in regions with heavy salt use. Suspension wear and aging electrical connectors also surfaced as common maintenance concerns as miles accumulated.

Fourth generation (2003–2009)

Oil leaks from valve covers and rear main seals were among the most commonly mentioned mechanical issues. Some owners also reported wear in wheel bearings, CV joints, and rising transmission-related noises as maintenance items aged, especially after high mileage.

Fifth generation (2010–present)

Overall reliability improved compared with earlier generations, and widespread mechanical faults are less common. Still, some owners report minor oil consumption in certain engines and occasional software or infotainment glitches. Recalls and service campaigns have addressed several drivetrain and safety-related concerns in this generation.

What to watch for and how to guard against problems

Proactive maintenance is the best defense against the most frequently reported issues. The following steps can help prolong the life of a 4Runner and catch problems early.

• Inspect the frame and underbody for signs of rust, especially in areas known for road salt exposure


• Regularly check for and repair oil leaks around valve covers and the rear main seal; address oil spots promptly


• Monitor oil consumption and perform timely oil changes with the correct grade and quantity


• Keep up with drivetrain and 4WD maintenance, including transfer case fluids and differential lubricants


• Schedule routine suspension and steering inspections to catch worn bushings, ball joints, and tie-rod ends early

Staying current with maintenance schedules, addressing leaks promptly, and treating underbody corrosion proactively can help maintain a 4Runner’s reliability and resale value over time.

Summary

Among 4Runner owners, frame rust and corrosion on older models stands out as the most commonly reported problem, with oil leaks, oil consumption, and drivetrain wear following as notable concerns. Across generations, proactive maintenance—especially for aging frames, engines, and 4WD components—remains crucial to sustaining performance and longevity.

What year did the 4Runner have a bad frame?

If you own a Toyota 4Runner that was manufactured between 2003 and 2009, your vehicle is most likely having a defective undercarriage that is prone to excessive and premature rusting. The following are the car models that fall in this category: Toyota 4Runner SR5. Toyota 4Runner Limited.

What is the best year Toyota 4Runner to buy?

The "best" year for a Toyota 4Runner depends on your priorities, but the 2017 model is often cited for its balance of modern features and ruggedness, while 2020 and newer models are recommended for the most up-to-date technology like Apple CarPlay and Android Auto. For those seeking a more budget-friendly option, models from 2010-2013 are a good value, and the fourth generation, especially 2007-2008, is praised for its available V8 engine and reliability. 
For the latest technology

• 2020 and newer: These models are the best for those who want modern conveniences. They feature updated infotainment systems with Apple CarPlay and Android Auto, as well as important safety features like pre-collision warning and adaptive cruise control. 

For a classic, rugged feel with modern reliability 

• 2017: This year is frequently praised for being a sweet spot—it's the most recent model before the major tech upgrades, making it ideal for those who prefer a more minimalist experience. It still offers excellent off-road capability and reliability with fewer electronic complexities. 

For a V8 engine and value

• Fourth Generation (2007-2008): If you're looking for a V8 engine, you'll need to go back to the fourth generation, with the 2007 and 2008 models specifically highlighted for their reliability and a comfortable driving experience. You can often find these for less than older or newer models. 

For a budget-friendly option

• 2010-2013: These are the least expensive options in the popular fifth generation. While they lack the modern tech of the 2020 and newer models, they are still highly reliable and can be found for a fraction of the price of a new vehicle. To save more, consider a higher-mileage example and have it thoroughly inspected. 

Do Toyota 4Runners have any issues?

Common problems: Some of the most common problems reported with the 2025 Toyota 4Runner include transmission concerns, engine performance issues, and interior design complaints.

Which year 4Runner to avoid?

You should avoid the 2003–2005 4Runners due to serious frame rust, head gasket issues, and dashboard cracking. Other years to consider avoiding are the 2001–2002 models for safety concerns and rust, and the 2015 model for infotainment and brake problems. 
2003–2005 (Fourth Generation) 

• Severe frame rust: This is a major issue, with many owners reporting the frame is irreparable. 
• Head gasket failure: V6 models, in particular, are prone to head gasket issues, which can be a costly repair. 
• Dashboard cracking: Owners have reported the dashboard cracking. 
• Other issues: Includes reports of faulty anti-lock brake systems (ABS), air injection pump failures, and check engine light problems. 

2001–2002 (Third Generation) 

• Safety rating: These models have low crash test scores, particularly in rear impacts. 
• Body rust: Prone to rust, making them unreliable for some families. 
• Off-road limitations: Manual transmission and locking rear differentials were eliminated during these years. 

2015 (Fifth Generation) 

• Infotainment issues: This model is known for an unreliable infotainment system that freezes, restarts, and has Bluetooth connection problems. 
• Brake problems: Owners have reported warped brake rotors. 
• Steering complaints: There are more NHTSA complaints about steering problems compared to other fifth-gen models. 
• Airbag defect: The 2015 is the only fifth-generation model with reported airbag non-deployment issues, which is a significant safety concern.