P0130 Code – O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)

Meaning:

The P0130 code is triggered when the O2 sensor voltage remained low for too long
When the ECM has determined that the O2 sensor voltage remained low for too long, P0130 happens

The ECM has determined that the O2 sensor voltage remained lower than normal (below .4v) for too long (20 seconds or more).

Main Symptoms:

Possible Causes:

  • Mostly a problem related to corrosion, loose terminal or burnt wire in the O2 sensor connector
  • Defective O2 sensor
  • Open or short in wiring to O2 sensor
  • Unmetered oxygen is getting back into exhaust system, most likely from holes in the system

Diagnostic Steps:

  • Visually inspect all wiring to O2 sensor for loose, open or short connections
  • Use a wiggle test to determine where the voltage drops out
  • Using an OBD2 scanner, check whether sensor 1 of bank 1 is switching properly. Normally it should switch evenly between rich and lean in rapid successions

Read More: OBD2 Codes List: Meaning, Fixes, and Free Download