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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 >> P2196 - O2 Sensor Signal Biased/Stuck Rich - Bank 1, Sensor 1 - DTC Chart
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P2196 - O2 Sensor Signal Biased/Stuck Rich - Bank 1, Sensor 1 - DTC Chart

P2196 - O2 SENSOR SIGNAL BIASED/STUCK RICH - BANK 1, SENSOR 1 - DTC CHART

Description:  A universal heated oxygen sensor bank 1, sensor 1 (HO2S11) indicating rich at the end of a test is trying to correct for an over rich condition. This DTC sets when the fuel control system no longer detects switching for a calibrated amount of time.
Possible Causes: 
  • Water in the harness connector
  • UO2SPC11 circuit open
  • Corrosion
  • Incorrect connections
  • Excessive fuel pressure
  • Leaking or contaminated fuel injectors
  • EVAP purge valve stuck open
  • Biased MAP sensor signal
  • Incorrect learned ethanol content
  • Contaminated MAF sensor (if equipped)
  • Positive crankcase ventilation (PCV) system
  • Contaminated oil
  • Oil overfill
  • Camshaft timing
  • Damaged universal HO2S11
  • Damaged PCM
Diagnostic Aids: 
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test H .
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