Technician A says a pressure gauge can be inserted into the oxygen sensor bore, and back pressure caused by the catalytic converter can be measured. Technician B says a vacuum gauge can be used to identify a restricted converter. Who is correct?

Question

Quizplus · Accepted Answer

Both technicians are correct. Technician A is correct in stating that a pressure gauge can be inserted into the oxygen sensor bore to measure back pressure caused by a catalytic converter, which is a common diagnostic technique. Technician B is also correct because a vacuum gauge can be used to diagnose a variety of engine issues, including a restricted catalytic converter, by observing the vacuum levels at different engine speeds.

Technician a Says a Pressure Gauge Can Be Inserted into the Oxygen