Find out the most common 2004 to 2010 Toyota Sienna problems. While there is nothing particularly wrong with this van, all vehicles have their common faults. Our experts review the symptoms, causes, and fixes for the top 5 issues owners have run into with the 2nd generation Toyota Sienna.
Common 2004 to 2010 Toyota Sienna Van Problems: 2nd Generation
1. O2 Sensor / Air Fuel Ratio Sensor Failure
Symptoms of O2 Sensor / Air Fuel Ratio Sensor Failure
- Drivability issues
- Check engine light for code P2197
How to Fix O2 Sensor / Air Fuel Ratio Sensor Failure
To fix this issue, replace the oxygen (O2) sensor, also known as the air-fuel ratio sensor. There is one at the front of the vehicle on the exhaust manifold and one on the backside. Steps include removing it with an O2 sensor socket and disconnecting the electrical connector.
2. MAF Sensor Failure
Symptoms of MAF Sensor Failure
- Drivability issues
- Hesitation when accelerating?
- Check engine light for code P0101
Causes of a Bad MAF Sensor
The mass air flow (MAF) sensor can fail on the 2004 to 2010 Toyota Sienna, but sometimes it causes drivability issues from collecting dirt and debris. Sometimes this dirt and debris is from a dirty engine air filter.
How to Fix MAF Sensor Problems on the 2004 to 2010 Toyota Sienna
Replace the MAF sensor, which is located on the air intake box. You can try cleaning the MAF sensor by removing it and cleaning it with MAF cleaner. Check the engine air filter and replace it if it’s dirty.
3. Ignition Coil Failure
Symptoms of Ignition Coil Failure
- Engine Misfires
- Check engine light for a misfire code
Causes of Ignition Coil Problems on the 2004 to 2010 Toyota Sienna
The ignition coils are known to fail on the 2nd gen Toyota Sienna
How to Fix Faulty Ignition Coils
There are three ignition coils on each side of the engine. Three are on one side facing the front of the van, and three are on the backside underneath the intake.
To replace the three on the front side, steps include removing the bolt, disconnecting the connector, and removing the ignition coil. We recommend replacing the spark plugs at the same time.
To get to the coils on the backside, you’ll have to remove the intake, and we recommend replacing the intake gasket at the same time.
4. EVAP Canister Failure
Symptoms of EVAP Canister Failure
- Check engine light for an EVAP code
Causes of a Defective EVAP Canister
It’s common for a failed EVAP canister to cause an EVAP code on this van. A loose or broken gas cap might be the cause, but it’s likely the EVAP canister.
How to Fix EVAP Canister Failure
The EVAP canister is in front of the fuel tank and it has a cover on top. Before replacing the EVAP canister, check the gas cap for a torn or broken gasket and it’s ability to lock. Replace the gas cap if it is defective
5. Power Sliding Doors Fail
Symptoms of Power Sliding Door Failure
- Power doors fail to work electronically
Causes of Sliding Power Door Problems on the 2nd Gen Toyota Sienna
The wiring on these doors can fray from use over time as the doors move back and forth.
How to Fix Sliding Power Door Damage
To fix this problem, replace the wiring harness with the motor assembly.
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2nd Generation Toyota Sienna Model Years
- 2004 Toyota Sienna
- 2005 Toyota Sienna
- 2006 Toyota Sienna
- 2007 Toyota Sienna
- 2008 Toyota Sienna
- 2009 Toyota Sienna
- 2010 Toyota Sienna
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