Close
Toyota RAV4 Problems

Rear oxygen sensor can cause emissions failure on Toyota RAV4

Problem Description and Possible Solution

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.
(6 people reported this problem)

Toyota RAV4 Vehicles With This Problem

RepairPal Verified
Average mileage: 47,250 (36,500–58,000)
3 model years affected: 1996, 1997, 2011
Not Your Toyota RAV4 Problem?
Brake problem? Or maybe a faulty head gasket cylinder?
Learn About Your Car Problems
Search For a Specific Car Problem
Viewing 0 comments