W/Harness Inspection

Engine

Engine Control - P0140 O2 Sensor Circuit No Activity Detected (Bank 1 / Sensor 2) - W/Harness Inspection

Terminal and Connector Inspection

1. Ignition "ON" & Engine "OFF"
2. Monitor the HO2S SNSR VOL. -B1/S2 parameter on the Scantool data list while wiggling the wiring harness and related connectors. Refer to "Signal Waveform & Data" in the "General Information" procedure.
3. The value should remain more or less unchanged. If not, check for the following conditions:
-Check for corrosion on terminals
-Check for terminal tension (at the HO2S and at the ECM)
-Check for damaged wiring
-Check the HO2S ground circuit for a good connection
-Check the 15 A sensor 2 fuse
-Check front and rear HO2S for connections being reversed.
4. Was a problem found in any of the above areas?