LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2090 (Engine Controls - Powertrain DTC Charts And Descriptions (Except Diesel & Hybrid)) >> DTC Diagnosis >> P0133 - O2 Circuit Slow Response (Bank 1, Sensor 1)

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

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. 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:  For the Taurus, Taurus X, Sable PZEVs, the powertrain control module (PCM) commands an air/fuel ratio that changes in the shape of a square wave. The PCM calculates the length of the resulting signal from the HO2S. The test fails when the length of the signal is less than a calibrated limit.
For all others, the PCM checks the HO2S signal frequency and amplitude. The test fails when the frequency and amplitude less than a calibrated limit.
Possible Causes: 
  • Contaminated HO2S
  • Exhaust leaks
  • Short/open wiring
  • Incorrect fueling
  • MAF sensor
  • Deteriorating HO2S
  • Inlet air leaks
Diagnostic Aids:  Access the HO2S test results from the generic OBD menu to verify the DTC.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Sable PZEV,
Taurus PZEV,
Taurus X PZEV		   - - refer to PINPOINT TEST DZ .
All others   - - refer to PINPOINT TEST DW .
scientia non olet · About LEMON Manuals