2008 Toyota Sienna

The 2008 Toyota Sienna is a popular minivan known for its reliability, spacious interior, and comfortable ride. It was available with two engine options: a 3.5-liter V6 engine producing 266 horsepower and 245 lb-ft of torque, and a 2.7-liter Inline-4 engine producing 187 horsepower and 186 lb-ft of torque. Both engines were paired with a 5-speed automatic transmission. Owners generally appreciate the Sienna’s practicality and smooth operation, but some common complaints include issues with power door malfunctions, dashboard cracking, and excessive oil consumption in some models.

Engine

3.5L V6

• Excessive Oil Consumption
  • Description/Symptoms: Some owners have reported higher-than-normal oil consumption, requiring frequent oil top-offs between scheduled oil changes. Visible blue smoke from the exhaust pipe, especially upon starting the engine, might be present. This can lead to engine damage if not addressed.
  • Solution: A revised PCV valve might help in some cases. If the oil consumption is severe, a more involved repair such as piston ring replacement may be necessary.
  • Estimated Cost to Fix: $50 - $200 (PCV Valve), $2,000 - $5,000+ (Piston Ring Replacement)
  • Recalls: None Found
• VVT-i Oil Line Leak
  • Description/Symptoms: The Variable Valve Timing (VVT-i) oil line, particularly the rubber hose section, can rupture, leading to rapid oil loss and potential engine damage. This is more common in colder climates.
  • Solution: Replacement of the rubber hose section with an updated, all-metal oil line is the recommended fix.
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found

2.7L Inline-4

• Excessive Oil Consumption
  • Description/Symptoms: Some owners have reported higher-than-normal oil consumption, requiring frequent oil top-offs between scheduled oil changes. Visible blue smoke from the exhaust pipe, especially upon starting the engine, might be present. This can lead to engine damage if not addressed.
  • Solution: A revised PCV valve might help in some cases. If the oil consumption is severe, a more involved repair such as piston ring replacement may be necessary.
  • Estimated Cost to Fix: $50 - $200 (PCV Valve), $2,000 - $5,000+ (Piston Ring Replacement)
  • Recalls: None Found

Transmission

5-Speed Automatic (U151E/U250E)

• Harsh Shifting/Slipping
  • Description/Symptoms: Some owners have reported experiencing harsh or delayed shifting, particularly between certain gears. Slipping, where the engine revs up without a corresponding increase in speed, can also occur.
  • Solution: A transmission fluid flush and fill may resolve the issue if it is minor. For more severe cases, a valve body replacement or a complete transmission rebuild/replacement might be required.
  • Estimated Cost to Fix: $150 - $300 (Fluid Flush), $800 - $1,500 (Valve Body), $2,500 - $5,000+ (Rebuild/Replacement)
  • Recalls: None Found

Suspension

• Rear Suspension Sagging
  • Description/Symptoms: Over time, the rear coil springs can weaken and sag, leading to a lower ride height in the rear, especially when carrying passengers or cargo. This can affect handling and ride quality.
  • Solution: Replacing the rear coil springs is the common solution.
  • Estimated Cost to Fix: $400 - $800
  • Recalls: None Found

Electrical

• Power Door Malfunctions
  • Description/Symptoms: The power sliding doors are a known trouble spot. Common issues include the doors failing to open or close properly, getting stuck, or making unusual noises. The problem can stem from a faulty door motor, cable issues, or a malfunctioning door latch assembly.
  • Solution: Diagnosis is critical to pinpoint the exact cause. Repairs can range from lubricating the tracks and cables to replacing the motor, latch, or cable assembly.
  • Estimated Cost to Fix: $200 - $800+ per door depending on the failed component
  • Recalls: None Found
• ABS Actuator Failure
  • Description/Symptoms: ABS light comes on. Fault codes indicate a failure of the ABS actuator. Brakes may work as normal, but ABS functionality is disabled.
  • Solution: Replacement of the ABS actuator assembly.
  • Estimated Cost to Fix: $800 - $1500
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Dashboard Cracking
  • Description/Symptoms: Many owners have reported cracks developing in the dashboard, particularly in warmer climates. This is primarily a cosmetic issue but can be unsightly and affect resale value.
  • Solution: There is no permanent fix other than replacing the entire dashboard, which is a costly repair. Some owners opt for dashboard covers to conceal the cracks.
  • Estimated Cost to Fix: $1,000 - $2,000+ (Dashboard Replacement), $50 - $200 (Dashboard Cover)
  • Recalls: None Found

Summary

The 2008 Toyota Sienna is generally a reliable minivan, but some common issues should be considered. Engine issues, particularly excessive oil consumption, can be costly to address. Power door malfunctions and dashboard cracking are also frequent complaints. While some repairs are relatively inexpensive, others, like engine work or dashboard replacement, can be quite costly. Potential buyers should have a pre-purchase inspection performed by a qualified mechanic to identify any existing or potential problems.