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: 110,754 (13,000–220,000)
12 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004, 2005, 2006, 2007, 2008, 2011
89 people reported this problem
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problem details
2004 Toyota Sienna 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.
2004 Toyota Sienna 121,000 mi,
The engine light comes on along with vsc light.
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.
2007 Toyota Sienna 85,000 mi,
oxigen sensors may fail resulting in ilumination of check engine light
2001 Toyota Sienna 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 $160) from local parts store. Access to the sensor is cramped and limited, but certainly do-able. Cleared codes, replaced sensor, drove for 100 miles, passed state emissions inspection, no issues after 2 months.
2007 Toyota Sienna 85,000 mi,
not fixed yet, check engine light due to oxygen sensors problem. 226$ for the parts, not sure it worth it.
2008 Toyota Sienna 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.
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 Sienna 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.
2008 Toyota Sienna 42,500 mi,
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.
2005 Toyota Sienna 150,000 mi,
O2 sensor has failed
2006 Toyota Sienna 120,000 mi,
Replace downstream front bank (left side) oxygen sensor - to turn off check engine light and pass inspection.
2000 Toyota Sienna 170,000 mi,
Had to replace both oxygen sensors in past four years.
2004 Toyota Sienna 135,000 mi,
O2 SENSOR FAILURE
2003 Toyota Sienna 51,000 mi,
Failed oxygen sensor
2000 Toyota Sienna 207,000 mi,
I had the Toyota dealership/repair here check because of the Check Engine light on dash; I'd had an auto parts store test the problem first. I told them I'd read all of your good info, and that someone had posted that a new part would cost about $160, plus labor. Today, the young man came back to the service waiting area and told me that because the engine/van was made in California? the sensor would cost $260, plus now I can't remember, $400 for labor? Or $200, I think. I was appalled. I asked why so expensive, I saw it on Youtube and it didn't seem to be a big job. He said the parts are rusted, whatever that means---I assume the parts that have to be hooked up to the sensor or ? Why do I need a sensor that is for a specific state, when NC doesn't required such strict emissions testing, I am sure. I told him that but I don't have a clear understanding of it...I'm old, and haven't had to deal with the cars in the family before. We've only had this van for about 3 years, bought with 200K miles on it, our daughter insisted we get something we could get in and out of easily. It has been a boon in that regard, but I've been concerned because it's old and has so many miles. (I actually love the van, it has (well worn) leather seats, and wish we had a new one like it and that we'd always had a van!) We had the 3rd row and one seat from the 2nd row taken out and stored in the garage; very handy to just put our groceries into the side and when moving house. I paid for today's service, and they'll order the part (from California, he said). Does having to buy the specific sensor for California sound logical to you? I liked the entire setup there, and the service man was very patient with old me, and I understand things don't come for free. Then, of course, to confuse the issue, the Check Engine light didn't appear after I'd driven away, stopped somewhere, and started up again...I am sure it was still there when I left the dealership. Thanks very much for your site, it's very informative.
2005 Toyota Sienna 148,000 mi,
I was driving one day and my check engine light came on. I took it to Advance Auto Parts and had a Diagnostics ran on it and they said my O2 sensors were messed up.
2006 Toyota Sienna 115,000 mi,
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 Sienna 202,000 mi,
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 Sienna 147,000 mi,
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.