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: 107,722 (26,777–267,000)
10 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003, 2004, 2005, 2006
83 people reported this problem
46 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.
21 people like thisFlag inappropiate
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.
21 people like thisFlag inappropiate
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.
13 people like thisFlag inappropiate
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?
12 people like thisFlag inappropiate
Failed oxygen sensor. I just ignored it. The check engine light finally stopped coming on about 6 months ago.
6 people like thisFlag inappropiate
Had to pay $250 to change the sensor........ Sucked!
5 people like thisFlag inappropiate
2004 Toyota Avalon90,000
replaced sensor
4 people like thisFlag inappropiate
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.
3 people like thisFlag inappropiate
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.
3 people like thisFlag inappropiate
1999 Toyota Avalon267,000
Check engine light came on few months ago and it was O2 sensor related.
2 people like thisFlag inappropiate
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
1 person likes thisFlag inappropiate
2006 Toyota Avalon106,000
One sensor failed first and then the other.
1 person likes thisFlag inappropiate
2003 Toyota Avalon111,000
check engine
2001 Toyota Avalon100,000
The car has the check engine light on I wonder what the problem.
2006 Toyota Avalon68,000
My wife purchased a 2006 Toyota Avalon just after Christmas. The warranty expired on the car last week. After the expiration of the warranty, the check engine light came on while I was driving. I took the car to a mechanic and the problem was a faulty oxygen sensor. The sensor was replaced. I was driving the car tonight and the check engine light came on again. My wife's previous car had 125,000 miles on it. She owned this car for ten years and the check engine light never came on during this time. A car should not be having engine problems with mileage this low.
2004 Toyota Avalon108,000
Light is on. Last time this happened it was the O2 sensor. Got to fix because car inspection is due next month.
Oxygen sensor failed and VSC & VSC OFF and CHECK lights switched on. After this fuel usage increased up to 20 liters per 100 kilometers. Could you advise how to get rid of this problems. Also I replaced one of the front Oxygen sensor and it also stopped working after 10 days.
1999 Toyota Avalon96,000
Rough running at times, especially at idle. I live at 11 feet above sea level. When living at 7,000 feet above sea level the problem greatly increased. However, since the oxygen sensor was changed the car runs great again! I love my 1999 Avalon!
2002 Toyota Avalon150,000
Both O2 sensors went out about 2 months apart
2000 Toyota Avalon71,000
I have been ignoring it because the car runs fine. Hopefully, I can get the part and install it myself.
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