Check Engine Light Due to Failed Oxygen Sensoron Toyota Sienna

One or more oxygen sensors may fail resulting in illumination of the Check Engine Light.

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Average mileage : 106,125 (13,000–220,000)
11 Years Affected: 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
66 people reported this problem
33 people shared problem details
2004 Toyota Sienna121,000
The engine light comes on along with vsc light.
7 people like thisFlag inappropiate
2007 Toyota Sienna85,000
oxigen sensors may fail resulting in ilumination of check engine light
3 people like thisFlag inappropiate
Not sure about mileage. Had to have 2 sensors replaced within a couple of years. Mechanic suggested clicking gas cap at least 7 times when tightening. Have had no problems since...fingers crossed.
3 people like thisFlag inappropiate
2001 Toyota Sienna130,000
Initial problem was indicated by "Check Engine" light. Follow-up with a OBD-II code reader (a $40 must-have item for a DIY repairman) pin-pointed a faulty Air/Fuel sensor on rear exhaust manifold. Replaced with a new sensor (about $160) from local parts store. Access to the sensor is cramped and limited, but certainly do-able. Cleared codes, replaced sensor, drove for 100 miles, passed state emissions inspection, no issues after 2 months.
3 people like thisFlag inappropiate
2001 Toyota Sienna65,000
Check engine light came on at about 25000 miles. Toyota dealership found thatboth O2 sensors were bad . I had them replace them at about $600. At 50,000 miles the O2 sensors went bad again. This time I did not bother replacing them as the gas mileage not noticeably affected. But, I need to stare at the check engine light every day.
2 people like thisFlag inappropiate
2004 Toyota Sienna164,147
The van functionally is great. It does not affect the way it drives at all. The check engine light came on and Auto Zone ran a diagnostic test; this test indicated that one of my O2 sensors was bad.
1 person likes thisFlag inappropiate
2007 Toyota Sienna85,000
not fixed yet, check engine light due to oxygen sensors problem. 226$ for the parts, not sure it worth it.
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2004 Toyota Sienna135,000
O2 SENSOR FAILURE
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2008 Toyota Sienna13,000
Very upset. Oxygen and fuel sensors bad on Toyota Sienna that only has 13,000 miles on it and has been impeccably maintained. Not a Toyota fan if I am going to have to pay for this.
1 person likes thisFlag inappropiate
2005 Toyota Sienna150,000
O2 sensor has failed
2005 Toyota Sienna50,000
Needed 3 sensors replaced as engine light on expensive
2006 Toyota Sienna120,000
Replace downstream front bank (left side) oxygen sensor - to turn off check engine light and pass inspection.
2000 Toyota Sienna170,000
Had to replace both oxygen sensors in past four years.
2000 Toyota Sienna118,500
Just the check engine light stays on and the dealer stated it is the o2 sensor.
2001 Toyota Sienna100,000
This is a known problem - pretty much all of the O2 sensors will crap out at about 100,000 miles. the 2001 Sienna has 3 sensors - two (the frontunder hood easy access and the rear under the vehicle easy access) can be taken care of by the home mechanic. Order OEM sensors off of ebay. the third )2 sensor is a total bitch to get to - I hired a guy off of Cragistlist - took him about an hour to get the old one off and plug in the new one) - there are some good DIY resources on line for this. Also my knock sensors went out in the engine at around 100K - did the same think - senors off of ebay and a relable mechanic to install.
2005 Toyota Sienna105,000
Check engine light and vacation light is on on the dashboard
2008 Toyota Sienna95,600
vsc and check engine light is on
2003 Toyota Sienna51,000
Failed oxygen sensor
2005 Toyota Sienna119,000
The oxygen sensor failed and needed to be replaced.
2007 Toyota Sienna150,000
Two oxygen sensors failed. Dealership says they traced it to the car computer, which was blowing various things (back windshield wiper control: 3 times, oxygen sensors: 2).
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