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Home >> Ford >> 2015 >> Focus S, Standard Trans, Gas >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> P0153 - O2 Circuit Slow Response (Bank 2, Sensor 1) - DTC Chart
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P0153 - O2 Circuit Slow Response (Bank 2, Sensor 1) - DTC Chart

P0153 - O2 CIRCUIT SLOW RESPONSE (BANK 2, SENSOR 1) - DTC CHART

Description:  The PCM monitors the universal heated oxygen sensor bank 2, sensor 1 (HO2S21) response time by commanding a calibrated fuel control routine. This routine sets the air to fuel ratio to a calibrated limit to produce a predictable oxygen sensor signal amplitude. This DTC sets when the oxygen sensor signal does not reach the predicted amplitude within a predetermined response time.
Possible Causes: 
  • Exhaust leaks
  • Incorrect fueling
  • Intake air system leaks
  • Mass airflow (MAF) sensor (if equipped)
  • Contaminated universal HO2S21
  • Deteriorating universal HO2S21
Diagnostic Aids: 
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test DZ .
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