Check Engine Light Due to Failed Oxygen Sensor on Toyota Sequoia

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 155,666 (50,000–350,000)
6 model years affected: 2001, 2002, 2003, 2004, more2005, 2008
52 people reported this problem
Viewing 1 - 19 of 19 comments
I've already replaced my o2 sensor right bank #2 and it's telling me that I need to replace again. At $150 to replace in our area that's a lot of money to be putting into an older vehicle. Does it really affect anything or is or more a nickel and dime part? I also just replaced my be latch on the cargo door and that was $500. What's up with this, I seem to be in the money pit zone of the vehicle. It's a 2002 Toyota Sequoia but I like the power (mileage could be a little better) but it is about to be recalled for passenger side airbag which could cause metal fragments to be ejected like a cannon but not there yet because not enough casualties yet I guess. Are these sensors easy enough to replace by myself anyone out there please feel free to chime in.
Check engine light came on. This has been a common problem several times over the past several years. Every time before the fault code showed "loose gas cap" & I just reset/cleared code & all was good for several months. This time the code said failed O2 sensor. I cleared code & after a short period 1-2 miles the light ce back on. I had dealer check & confirm bad O2 sensor. Dealer wants $465 to replace......Hell No, I'll attempt myself
I too have had a problem with the right front O2 sensor in my 2002 Sequoia SR5... My mechanic said not to worry about it unless I just wanted to replace it. However, it does cause the Check Engine light to stay on, so I haven't had that feature for a while, and finally a problem has arisen where it might have saved a more costly repair. It doesn't sound as though replacing it would likely have done much good either though. Seems as though when there is a consistent problem with a part the manufacturer should make good on it.

In all fairness, I have to say that otherwise I love my Sequoia, and it has been a reliable vehicle; only problems since I've owned it (my son had it the first two or three years; bought it new), is the sensor, the back door latch (which also seems to be common to this model), and now a radiator replacement. Have read about the "frame rot" in looking for information today... hope that is not on my horizon. 8/
Check engine light directed technician to examine catalytic converter. Needs to be replace but procedure calls for moving rear o2 sensors forward and they are so rusted it will cost $2500 to deal with...
Check engine light came on. I used a scan tool to identify the cause. It was the right front oxygen sensor. Paid over $200 for the sensor from the dealer, installed it myself, no more problems.
Check engine light came on, mechanic says 02 sensor and cracked catalytic converter; $1000 to repair. With the age of the car and the mileage, I am not sure if I should repair it.
After reading some related report and gathered information to the similarity of my own problem I would like to add this situation I have encountered to my 2002 Sequoia SR5. A check engine light come "ON" and "Off" in any occasion I read the Manual and compared my problem to the rest of the problems written to this column I figured that I was not the only one affected so I would like to know if the Toyota is aware of the problem, if so why is this on going problem was not on recall as factory deficiency? I have the same problem as I said, and when my SUV was scheduled for SMOG check the final rating was a failure because of the check failure registered to the machine. Needless to say I lost my SMOG service pay and I re scheduled for retest again after the check engine light come off.
Check engine light came, I had it reset, but then it happened again. This started at 75,000 miles, and has continued to this day when I have now reached 134,000 miles.
over the life of my car I've replaced all 4 O2 sensors at least once, some as many as 2 or 3 times. The front ones are especially irritating as the dealer is usually the only one who has these and they are expensive
check engine light came on, i ignored for 6+ months because it had happened 5 years before and it cost $1100 in various fixes to resolve; going to pick up again today for $400