Riviera V6-3.8L SC VIN 1 (1995)
Oxygen Sensor: Testing and Inspection
The heated oxygen sensor circuits 412 or 413, if open, should set a Diagnostic Trouble Code (DTC) P0134 and the Tech 1 will display a constant
voltage between 350 - 550 mV. A constant voltage below 250 mV in the sensor circuit should set DTC P0131, while a constant voltage above 750 mV in
the circuit should set DTC P0132. DTC P0131 and DTC P0132 could also be set as a result of fuel system problems. Refer to DTC charts for conditions
that can cause a lean or rich system.
A fault in the heated oxygen sensor element or circuits 135 or 639 will result in longer times to "Closed Loop" fuel control operation and slower oxygen
sensor response. This may cause increased emissions, especially at startup. See: Computers and Control Systems/Testing and Inspection
