Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.


definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
33,836 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2009 Toyota Sienna engine problems

engine problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2009 Toyota Sienna:

Unsubscribe any time. We don't sell/share your email.

2009 Toyota Sienna Owner Comments

problem #3

Sep 012013

Sienna 6-cyl

  • Automatic transmission
  • miles


2009 Toyota Sienna. Consumer writes in regards to engine overheating. The consumer stated he replaced the fan relay and thermostat. However, the vehicle continued to overheat. The dealer replaced the radiator and water pump, but the overheating continued. The dealer informed the consumer they looked into the cylinders with a borescope and saw marks on the cylinder wall which lead them to the conclusion that the head gaskets were bad and they would have to be removed and sent to a machine shop to see if they were warped and the cylinders and engine block would have to be inspected to see if there was an issue.

- Ringtown, PA, USA

problem #2

Jul 222013

Sienna 6-cyl

  • 98,509 miles
2009 Toyota Sienna minivan developed corroded rear air-conditioning lines after only 4 years. Corrosion caused complete loss of A/C coolant. It cost me $118 to have the A/C system tested only to find out that it will cost me another $1578 to repair the problem...and there's no guarantee that this won't happen again in another 4 years. Dealership won't help. Toyota corporate won't help. It is a scam that they use untreated aluminum A/C lines that they admit are prone to corrosion in northern climates where salt is used on the roads. Easy fix: Paint the A/C lines! Toyota won't offer any help whatsoever! I have found an emotional state beyond rage.

- Plover, WI, USA

problem #1

Feb 062009


  • 3,000 miles
The contact owns a 2009 Toyota Sienna. The contact started the vehicle and there was an excessively loud rattling noise in the engine compartment. In addition, an odor of anti-freeze circulated inside of the vehicle. The failure only occurred when the vehicle was started. The vehicle was taken to an authorized dealer. The vehicle was not inspected or repaired for the malfunction. The failure mileage was 3,000.

- Mccoll, SC, USA

Not what you are looking for?