Century V6-173 2.8L VIN W FI (1987)
Oxygen Sensor: Testing and Inspection
The "Scan" has several positions that will indicate the state of Oxygen Sensor (O2) voltage, integrator, and block learn. A problem in the O2 sensor
circuit or fuel system, should set a Code 13 (open circuit), Code 44 (lean indication), Code 45 (rich indication), or Code 61 degraded, or contaminated
O2 sensor. Refer to System Diagnosis / Diagnostic Charts / Diagnostic Trouble Code Charts if any of these codes were stored in memory.
