2005 Toyota Highlander Problems: 1 Issues Every Owner Should Know
2005 model year · 0+ owner reports · Updated April 2026
According to Au7o's analysis of 0+ owner reports, the 2005 Toyota Highlander has 1 documented known issues, with 1 rated critical. The most serious is 2.4L 2AZ-FE Head Gasket and Head Bolt Thread Failure ($2,500-$5,000 repair). Across all issues, repair costs range from $2,500 to $5,000. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2001-2007 Toyota Highlander 2.4L 2AZ-FE, the 2001-2007 Highlander with the 2.4L 2AZ-FE 4-cylinder engine suffers from a design flaw where the aluminum head bolt threads strip out of the engine block. The plastic intake manifold traps heat against the block, causing thermal fatigue of the aluminum threads. This leads to head gasket failure, coolant leaks, and overheating. In severe cases, the stripped threads make a simple head gasket replacement impossible, requiring thread repair inserts (Time-Serts) or complete engine replacement. This is a known issue across Toyota vehicles using the 2AZ-FE engine.
Common Symptoms
- Coolant loss without visible external leaks
- White sweet-smelling exhaust smoke
- Engine overheating
- Chocolate milk appearance of oil (coolant mixing)
- Oil level higher than normal
- Rough running or hard starting when cold
- Coolant bubbling in overflow tank
How to Fix
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- UpgradeMulti-layer steel head gasket set for a reliable, long-lasting seal (Fel-Pro Head Gasket Set)
- UpgradeHigh-strength head studs provide even clamping force and prevent repeat failures (ARP Head Stud Kit)