Diagnostic trouble code

P0153 Bank 2 Sensor 1 Oxygen Sensor Slow Response

The upstream oxygen sensor on bank 2 is switching more slowly than expected.

Oxygen Sensor & Heater Codes

Read This First

This code identifies the failed diagnostic test or circuit family. Confirm the basic checks before replacing parts, and keep freeze-frame data until the repair is verified.

Common Checks

  • Inspect for exhaust leaks ahead of the driver-side upstream sensor.
  • Check sensor wiring and connector condition.
  • Confirm the engine is not running rich or lean for another reason.

Common Repairs

  • Repair exhaust leaks or wiring faults.
  • Replace the upstream bank 2 sensor if the sensor response remains slow.

Mustang Notes

Model-Year Applicability

Listed for 1996 and newer traditional gasoline Mustang pages in this first-pass catalog. Engine, calibration, and Ford-specific codes may narrow that range as more service data is added.

Sources

  1. SAE J2012DA Digital Annex of Diagnostic Trouble Code Definitions