Lot T258498: 1999 Toyota 4Runner SR5

The 1999 Toyota 4Runner (3rd generation) is known for its excellent reputation, but there are some common issues to watch for, especially given the high mileage:

Head Gasket Failure – The most significant concern, particularly with the 3.4L V6 engine in your SR5. Look for overheating, coolant leaks, or milky oil. This is especially critical on a 345k-mile vehicle.

Rust & Frame Corrosion – Common in areas with road salt or harsh winters. The FAQs in this listing specifically ask about frame rust. Given the Pacific Northwest location (Portland), check the undercarriage, rear diff mounting points, and body-to-frame mounts carefully.

Timing Belt/Water Pump – The FAQ mentions this specifically. On this engine, the timing belt service is critical and expensive if overdue or neglected.

Transmission Issues – The automatics can develop slipping, delayed engagement, or fluid leaks with age and high mileage.

Suspension Wear – Ball joints, bushings, and shock absorbers wear out over 345k miles. Check for uneven tire wear and a rough ride.

Electrical Issues – Power windows, dashboard warning lights, and battery drains are reported.

Oil Leaks – Valve cover gaskets and rear main seals are common culprits.

Transfer Case – For 4WD models, check for difficulty engaging 4WD and unusual noises.

With 345,130 miles and the Pacific Northwest climate, I’d pay particular attention to frame rust and whether the timing belt service has been documented. The good news: the 3.4L V6 is famously durable when maintained!

Would you like me to look at similar 4Runners, or do you have questions about specific maintenance on this one?