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: 109,586 (14,800–267,000)
11 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005, 2006, 2008
92 people reported this problem
52 people shared problem details
2003 Toyota Avalon98,000
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.
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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.
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2006 Toyota Avalon67,000
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.
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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?
Upvoted (13)Flag Inappropriate
Failed oxygen sensor. I just ignored it. The check engine light finally stopped coming on about 6 months ago.
Had to pay $250 to change the sensor........ Sucked!
2004 Toyota Avalon90,000
replaced sensor
2000 Toyota Avalon142,000
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.
1998 Toyota Avalon80,000
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 Avalon267,000
Check engine light came on few months ago and it was O2 sensor related.
2000 Toyota Avalon70,000
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
2006 Toyota Avalon106,000
One sensor failed first and then the other.
2002 Toyota Avalon200,000
After the car has warmed up, and I stop at the grocery store or something else, the car will act like it wants to stall when I want to start it up again
2000 Toyota Avalon199,000
My check engine light came on a few months ago, and sometimes the car would run ruff or act like it was going to stall. It doesn't do it constantly, but enough that I have come close to stalling out 3 or 4 times in the last 4-5 months. I was told it was the air to fuel ration sensor? What do I need to do?
2003 Toyota Avalon140,000
check engine comes have to change sensor, happens all the time, abs lights also
2002 Toyota Avalon14,800
Check engine light on
2008 Toyota Avalon154,725
Check engine light came on after the dealer overfill the transmission fluid and it leaked on the sensor. Dealer rreplaced it
The check engine is non and it's due to ogeygen sensor, but I have been runing it for 3 years and it's working just fine! Even my mpg is the same
2003 Toyota Avalon111,000
check engine
2001 Toyota Avalon100,000
The car has the check engine light on I wonder what the problem.
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