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P0133 - O2 Circuit Slow Response (Bank 1, Sensor 1)

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0133 - O2 CIRCUIT SLOW RESPONSE (BANK 1, SENSOR 1)

Description:  The heated oxygen sensor (HO2S) monitor checks the HO2S frequency and amplitude. If during testing the frequency and amplitude fall below a calibrated limit, the test fails.
Possible Causes: 
  • Contaminated HO2S sensor
  • Exhaust leaks
  • Shorted/open wiring
  • Incorrect fueling
  • Mass air flow (MAF) sensor
  • Deteriorating HO2S
  • Intake air leaks
Diagnostic Aids:  Access the HO2S test results from the Generic OBD-II menu to verify the DTC.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   - - refer to PINPOINT TEST DW .
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