A cracked exhaust pipe before the upstream HO2S can cause all of the following except:

Question

Quizplus · Accepted Answer

A cracked exhaust pipe before the upstream HO2S can allow excess air to enter the exhaust system, which can cause a lean HO2S signal and a rich air-fuel ratio. This can also result in poor fuel economy. However, it would not cause O2 sensor heater failure as this is typically caused by a fault in the sensor itself or its wiring.

A Cracked Exhaust Pipe Before the Upstream HO2S Can Cause