Oxygen Sensor Test Mode

This mode allows monitoring of oxygen sensor fault limits and actual values during test cycle. The test cycle has specific engine operating conditions that must be met for completion. This information is used to determine the efficiency of the catalytic converter.

To access OXYGEN SENSOR TEST mode, turn ignition switch to OFF position. Ensure test equipment is properly connected. Program scan tool using the following steps:

• Select vehicle and engine selection menu (optional). See Figure.
• Select year, engine, model and any additional information requested by scan tool (optional).
• Follow operating instructions from scan tool menu.
• Select GENERIC OBD-II FUNCTIONS.
• Select OXYGEN SENSOR TESTS.
• Select appropriate oxygen sensor test and follow menu instructions.