Rear oxygen sensor can cause emissions failureon Toyota Avalon

The rear Oxygen sensors are a critical element in fuel control (unlike other vehicles) and can cause an emissions test failure for high CO and HCs. The sensing element cracks and and reports an erroneous steady state lean condition which confuses the computer, which in turn makes the fuel mixture overly rich.

RepairPal Verified
Average mileage : 45,000 (45,000–45,000)
4 Years Affected: 1995, 1996, 1997, 2007
6 people reported this problem
0 people shared problem details
Related Items:
The Check Engine Light may illuminate because a component of the oxygen sensor stops working. A...
Check engine light came on. The Master Air flow sensor (P0171) was replaced less than 5 months...
My check engine light came on recently and the code indicates Bank 1 sensor 1 is the problem. I...
My check light stays on, although I have no other symptoms. Someone told me it might need oxyge...

Related Content