Car Problem Reports

Toyota Sienna Oxygen Sensor May Fail

Toyota Sienna Problem
58 Reports
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Model Years Affected: 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008

Average Mileage: 104,271 mi (13,000 mi - 220,000 mi)


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

  • Visitor, , 121,000 mi

    The engine light comes on along with vsc light.

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  • Visitor, , 85,000 mi

    oxigen sensors may fail resulting in ilumination of check engine light

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  •  Rookie

    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.

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  • Visitor, , 130,000 mi

    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.

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  • Visitor, , 65,000 mi

    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.

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  • Visitor, , 164,147 mi

    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.

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  • Visitor, , 85,000 mi

    not fixed yet, check engine light due to oxygen sensors problem. 226$ for the parts, not sure it worth it.

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  • Visitor, , 135,000 mi


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  • Visitor, , 13,000 mi

    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.

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  • Visitor, , 100,000 mi

    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.

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