P0166 OBD II Trouble Code 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)

Detailed information on troubleshooting and repairing a P0166 DTC code which refers to the O2 sensor circuit with no detected activity.

Symptoms of P0166 OBD II Trouble Code

MIL (Malfunction Indicator Lamp) on
May idle or drive poorly
Fuel economy may decrease

Common Causes of P0166 OBD II Trouble Code

Bad Bank 2, position 3, o2 sensor
Wiring problem, melted harness, broken connectors, etc.
Bad PCM

P0000 OBD II Trouble Code No Diagnostic Trouble Codes Found

P0001 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit/Open

P0002 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0003 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0004 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0005 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit/Open

P0006 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit Low

P0007 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit High

P0008 OBD II Trouble Code Engine Positions System Performance Bank 1

P0009 OBD II Trouble Code Engine Positions System Performance Bank 2