P0153 – O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)

Meaning:

When the O2 sensor or ECM can’t adjust air to fuel ratio as it’s supposed to, the P0153 happens
The P0153 is triggered when the O2 sensor or ECM can’t adjust air to fuel ratio as it’s supposed to even when the engine is running

The O2 sensor or ECM can’t adjust air to fuel ratio as it’s supposed to even when the engine is running.

Main Symptoms:

  • Generally doesn’t come with symptoms. However, in some cases the Check Engine Light may come on and fuel economy may reduce

Possible Causes:

  • First O2 sensor in bank 2 is faulty
  • Short, open or broken wire in O2 sensor circuit
  • Exhaust leak

Diagnostic Steps:

  • Visually inspect all wiring to second O2 sensor for loose, open or short connections
  • Use a wiggle test to determine where the voltage drops out
  • Visually check for exhaust leaks or air inlet leaks
  • Using an OBD2 scanner, check whether sensor 1 of bank 2 is switching properly

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