Check Engine Light Due to Failed Oxygen Sensor on Toyota Avalon

The Check Engine Light may illuminate because a component of the oxygen sensor stops working. As a result the engine computer is unable to determine the proper ratio of air to fuel for the engine. Replacing the failed oxygen sensor should correct this concern.


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Average mileage: 113,118 (26,777–277,000)
13 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2012
101 people reported this problem
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Viewing 1 - 20 of 55 problem details
2003 Toyota Avalon 98,000 mi,
My check engine light is on. They say it is the o2 sensor. I was told that if don't properly place on your gas cap this could happen. However, I do want to fix the problem. As a woman, I have learned to not much trust many repair shops. How much is too much for this job.
2006 Toyota Avalon 67,000 mi,
I had a check engine light with an error code for bank 1 sensor 2; changed the sensor and performed soft computer reset. within 10 minutes light illuminated again; error code for same sensor.
Check engine light on - fix described as "replaced air fuel ratio sensor and cleared code in computer" - $224 labor, $242 parts cost, $22.40 shop supplies. Is this reasonable?
Yes, I have this problem. I purchased an OBDII tool online. When it is time for inspection, I hook up the tool, turn off the MIL light and codes, drive 100 miles, and it passes. Tool is only about $50. There is nothing wrong with the car, runs great, think this is a scam to get you to bring it to a dealer and they charge you $350-$700 to repair, and it still comes on. Then they want to tell you it is something else, and charge you again. Happened to my neighbor.
2003 Toyota Avalon 140,000 mi,
check engine comes have to change sensor, happens all the time, abs lights also
Failed oxygen sensor. I just ignored it. The check engine light finally stopped coming on about 6 months ago.
1998 Toyota Avalon 80,000 mi,
Car still runs fine. To eliminate check engine light from staying on, disconnect positive battery cable for 5 minutes, reconnect, then you can dive car (to inspection station) without light appearing for about 5 key cycles.
1999 Toyota Avalon 267,000 mi,
Check engine light came on few months ago and it was O2 sensor related.
2000 Toyota Avalon 142,000 mi,
Check engine light came on. No performance issues that I could tell. They replaced the B1S1 O2 Sensor. The Sensor was welded into place on to the manifold over time and it was really inaccessible. It required a lot of time and labor to complete the repair however it was not done at a dealer. It was done at a small shop.
2004 Toyota Avalon 90,000 mi,
replaced sensor
Had to pay $250 to change the sensor........ Sucked!
2006 Toyota Avalon 106,000 mi,
One sensor failed first and then the other.
2003 Toyota Avalon 111,000 mi,
check engine
2000 Toyota Avalon 98,000 mi,
The "check engine" light came repair shop checked the cars computer. It was the o2 sensor accessible from under the car....not sure if I can do the repair myself (hard to reach). The auto shop wanted $220 for the part (plus $85 to install)....I found it on eBay for $78 (Bosch part# 13540).
1996 Toyota Avalon 60,000 mi,
Check engine light came on. The repair shop said it was a failed oxygen sensor-front, and charged me $202.33 for the part and $97.40 for the labor.
2008 Toyota Avalon 154,725 mi,
Check engine light came on after the dealer overfill the transmission fluid and it leaked on the sensor. Dealer rreplaced it
2000 Toyota Avalon 70,000 mi,
had to replace oxygen sensor gas mileage went up afterward but still not as good as first 50,000 miles otherwise great all auto shops at dealers that i know of are liars and need to locate good local mechanic jay hicks
2004 Toyota Avalon 108,000 mi,
Light is on. Last time this happened it was the O2 sensor. Got to fix because car inspection is due next month.
2000 Toyota Avalon 71,000 mi,
I have been ignoring it because the car runs fine. Hopefully, I can get the part and install it myself.
2001 Toyota Avalon 148,895 mi,
Check engine, VSC and VSC lights came on. Brought to the dealer. They said it was an O2 sensor, replaced it for $388. Nine days later the 3 lights came back on and this time, I just got an OBDII unit and erased the codes which were "mixture too lean". The car runs well. Gas milage is no different. I think it may have been something like fuel injectors were clogged. It was an obscene amount of $$ to pay the dealer to have the lights come back on in 9 days!