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Diagnostic Menu
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O2 Monitor Tests
OBD II regulations require applicable vehicles monitor and test oxygen
(O2) sensors to determine problems related to fuel and emissions. The
O2 Monitor Tests allows retrieval of completed O2 sensors monitor
test results.
The O2 Monitor Tests is not an on-demand test. O2 sensors are
not tested when selected via the menu. O2 sensors are tested when
engine operating conditions are within specified limits.
If the vehicle communicates using a controller area network (CAN),
O2 monitor tests are not supported by vehicle. A message is
displayed. See “Diagnostic Monitor Tests” to see O2 monitor data.
O2 sensors are located before (upstream) and after (downstream)
catalyst(s). Sensors are named (xy) for their position to both cylinder
banks and catalysts.
The O2 sensor for cylinder bank 1 has prefix 1y while O2 sensor
for cylinder bank 2 has prefix 2y.
The O2 sensor upstream of catalyst (closest to engine) has suffix
x1 while O2 sensor downstream of catalyst has suffix x2. If
vehicle contains more catalysts, O2 sensor downstream of
second catalyst has suffix x3 and O2 sensor downstream of next
catalyst has suffix x4.
For example, O2S21 is upstream O2 sensor for cylinder bank 2.
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