The Toyota 4Runner is a popular SUV that is currently in its 5th generation. This post and video reviews the top Toyota 4Runner problems owners have experienced with the 4th generation, years 2003 to 2009.
Video: Top 5 Problems Toyota 4Runner
Top 5 Issues with the 4th Gen Toyota 4Runner (2003 to 2009)
1. Exhaust Manifold Failure
Symptoms of Exhaust Manifold Failure
- The exhaust manifolds can rot quickly
Causes of Exhaust Manifold Failure
The exhaust manifold tends to crack where the manifold and flange meets the engine head.
How to Fix Exhaust Manifold Failure
Replace the exhaust manifolds.
Read more about how to check for an exhaust manifold leak
2. A/C Stops Working
Symptoms of A/C Problems with the 4th Gen Toyota 4Runner
- A/C stops working
- A/C light flashes
Causes of A/C Problems
If this problem happens, the AC compressor is not revving at the speed of the engine, so it enters default mode. Unless the A/C system is leaking Freon, the A/C compressor relay has probably failed.
How to Fix A/C Problems
Replace the A/C compressor relay from the fuse box module.
3. Head Gasket Problems
Symptoms of Head Gasket Problems
- Engine overheating
- Missing coolant with no signs of coolant leaks
- White cloud from the tail pipe
- Gurgling heard inside the interior
Causes of Head Gasket Problems
The 4.0L engine may have a head gasket leak after about 125,000 miles.
How to Fix Head Gasket Problems
If completing this repair yourself, we recommend you pay close attention to the timing chain mechanism. If they are slightly off or stretched, the car will not restart or run, and it may be a good idea to replace both the head gasket and the timing chain at the same time.
4. No Start Condition
Symptoms of a No Start Condition
- Car does not start—no clicking and the battery is good
Causes of the 4th gen 4Runner not Starting
The starters are known to corrode on the 4th gen Toyota 4Runner.
How to Fix a No Start Condition
Replace the starter.
5. Frame Rot
Symptoms of Frame Rot
- Parts of the frame may rot and deteriorate
How to Fix Frame Rot
Toyota does not have a recall for frame rot on the 4th gen 4Runner.
Read more about how to inspect frame rot
Fix Your Own Toyota 4Runner with How-to Videos
Follow step-by-step instructions from expert mechanics and learn how to do common repairs on the 4th gen 4Runner like the headlights and brakes and repairs on other makes and models with our how-to videos.
4th Generation Toyota 4Runner Model Years
- 2003 Toyota 4Runner
- 2004 Toyota 4Runner
- 2005 Toyota 4Runner
- 2006 Toyota 4Runner
- 2007 Toyota 4Runner
- 2008 Toyota 4Runner
- 2009 Toyota 4Runner
Related Content
- Think You Have An Exhaust Manifold Leak?
- AC Blows Cold on One Side and Hot on the Other?
- How to Diagnose a Bad AC Compressor
- Is Your Rusted Car Frame Safe to Work Under?
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