Check Engine Light Due to Failed Oxygen Sensor on Toyota Sienna

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

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Average mileage: 110,096 (13,000–220,000)
12 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004, 2005, 2006, 2007, 2008, 2011
84 people reported this problem
38 people shared problem details
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.
2004 Toyota Sienna121,000
The engine light comes on along with vsc light.
2007 Toyota Sienna85,000
oxigen sensors may fail resulting in ilumination of check engine light
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 $160) from local parts store. Access to the sensor is cramped and limited, but certainly do-able. Cleared codes, replaced sensor, drove for 100 miles, passed state emissions inspection, no issues after 2 months.
2007 Toyota Sienna85,000
not fixed yet, check engine light due to oxygen sensors problem. 226$ for the parts, not sure it worth it.
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.
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.
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.
engine light came on we plug a hand held diagnostic tool it read H025 Bank 1 sensor 2 heather circuit low.I need to see where bank 1 and 2 are located.
2004 Toyota Sienna135,000
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.
2003 Toyota Sienna51,000
Failed oxygen sensor
2008 Toyota Sienna42,500
Bought as CPO vehicle and 6 months later check engine came on. Dealer said was bad oxygen sensor and $500 fix, fortunately covered under warranty. Waited 3 weeks to get part and then appointment. During that time noticed in addition to check engine light, lost stability control and had much lower fuel economy until it was replaced.
2006 Toyota Sienna115,000
Not fixed yet, as I'm tight on money. Check engine, bad, and Trac off lights are now on in my van. Dealer says it's all because of bank 1 sensor 2 needs replacing.
2004 Toyota Sienna202,000
Check engine light going on and off, finally had it diagnosed and it has an O2 sensor that is not working at all.
2001 Toyota Sienna147,000
Yesterday while driving I noticed engine light on. It had been working prior. I was told not to drive car because I could damage engine.
2005 Toyota Sienna150,000
O2 sensor has failed
2005 Toyota Sienna50,000
Needed 3 sensors replaced as engine light on expensive
2000 Toyota Sienna118,500
Just the check engine light stays on and the dealer stated it is the o2 sensor.
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replaced speed sensor & 2 oxygen sensors. codes wont clear & car is still not running right
I replaced the front oxygen sensor myself,but the check engine light still on. Checked at a toy...
I have a code that says the oxygen sensor is bad , but i replaced both the front and rear sens...
code po135 can not locate problem have replaced both front and back oxygen sensors any advice?
The van is running fine. The dealership first wanted to replace the exhaust manifold and the O2...

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