Is the 2021 Toyota 4Runner reliable?

Yes—overall it’s considered one of the more reliable midsize SUVs, with a proven 4.0L V6 and body-on-frame construction that has a long track record when maintained properly.

What are the most common 2021 Toyota 4Runner problems?

Commonly reported issues include brake vibration/rotor wear, interior rattles, occasional infotainment connectivity glitches, and suspension or alignment-related tire wear—especially with heavy use or off-road driving.

Are maintenance costs high for a 2021 4Runner?

Maintenance costs are typically moderate for the class; routine services are straightforward, but tires, brakes, and suspension components can cost more if you use all-terrain tires, tow frequently, or drive rough trails.

What are the best years to buy a Toyota 4Runner?

Many buyers prefer later fifth-generation models for updated safety tech and features, including 2020–2021, while also shopping well-maintained earlier years for value—condition and service history matter as much as the model year.

What should I check before buying a used 2021 Toyota 4Runner?

Check for brake pulsation on a test drive, look for uneven tire wear (alignment/suspension clues), verify 4WD engagement (if equipped), inspect for underbody rust or off-road damage, and confirm service records and any software updates for the infotainment system. For deeper details, get a complete owner’s guide with full specs, trim differences, and the recommended maintenance schedules to keep your 2021 Toyota 4Runner running at its best.

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Reliability AnalysisBased on known issue patterns, repair cost data, and ownership trends · How we score

2021 Toyota 4Runner Reliability ReportCommon Problems, Repair Costs & Expert Verdict

92/ 100

LOW RISK

Grade: A-

A modern classic, the 2021 4Runner sacrifices refinement for unparalleled reliability and go-anywhere capability.

Full system breakdown + what I would do

Should You Buy the 2021 Toyota 4Runner?

The 2021 Toyota 4Runner is an absolute rock-solid choice for anyone prioritizing unwavering dependability and serious off-road capability over modern refinements. This SUV is built to last for hundreds of thousands of miles with minimal major issues, making it one of the safest used vehicle investments available today. Its venerable powertrain is nearly bulletproof, instilling confidence that it will get you where you need to go, regardless of the conditions.

Biggest Strengths

Legendary 4.0L V6 engine durability
Robust 5-speed automatic transmission
Exceptional off-road capability and chassis longevity

Top Risk Areas

The systems that break first on the 2021 Toyota 4Runner. Mileage windows, repair costs, and fix-before-you-buy notes are in the full report.

HVAC System Componentsmoderate

Infotainment System Glitchesminor

Underbody & Frame Corrosionmoderate

Typical mileage, cost ranges, and the exact what-to-check list are in the full report.

NHTSA Recalls

1 recall on record from NHTSA. Check your VIN atnhtsa.gov to see if the repair was performed.

EQUIPMENT:OTHER:LABELS

Southeast Toyota Distributors, LLC (SET) is recalling certain 2020-2022 4Runner vehicles equipped with 20-inch Black Gunner Wheels. The load carrying capacity modification labels are incorrect. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 110, "Tire Selection and Rims."

What breaks on the 2021 Toyota 4Runner?

Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.

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Toyota 4Runner by Year

Compare reliability scores across nearby years of the Toyota 4Runner. Click any year for its full report.

All Toyota 4Runner years ranked →Toyota 4Runner years to avoid →Toyota 4Runner common problems →

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Frequently Asked Questions

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