The oxygen sensor breaks on the Toyota Highlander prematurely

Many drivers complain that a failed oxygen sensor is a major headache on the Toyota Highlander. When the 

oxygen sensor fails, it throws a check engine light on the dashboard. When this happens, the computer cannot get 

the right air-to-fuel ratio for the engine. Toyota suggests replacing the failed oxygen sensor to fix the problems, which can run between $530 and $600.

Some drivers note that there are other sensors that could cause a similar issue. A Toyota dealership replaced the 

Mass Air Flow Sensor and the O2 sensor, which did not fix the problem. While a check engine light is annoying, sometimes it did impact the Highlander’s ability to accelerate or maintain speed.