SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 589 (ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM L3 WITH TC])DTC P0133NOTES
2008 Mazda 6 s Sport, 4D Hatchback, Standard

DTC P0133: Notes

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Notes
WARNING: This page is about a different car, the 2007 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0133 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0133 Front HO2S circuit slow response
DETECTION CONDITION 
  • An oxygen sensor malfunction can be detected by measuring the average frequency of the oxygen sensor signal, time required to pass from rich to lean, and the time required to pass from lean to rich.
  • The average frequency of the oxygen sensor signal is more than the threshold value.

    MONITORING CONDITIONS 

    • HO2S heater, HO2S, and TWC Repair Verification Drive Mode
    • The following conditions are met:
      • Front HO2S heater monitor is completed.
      • ECT sensor and front HO2S heater are normal
      • Engine speed: 1, 750-3, 500 RPM. 
      • Charging efficiency: 35-63%  (at engine speed of 2500 RPM  )
      • Fuel system loop status is closed loop fuel control.
      • Engine coolant temperature above 70°C {158°F} 

Diagnostic support note 
  • This is an intermittent monitor. (HO2S)
  • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
  • DIAGNOSTIC MONITORING TEST RESULTS is available.
  • PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
  • FREEZE FRAME DATA is available.
  • DTCs are stored in the PCM memory.
POSSIBLE CAUSE 
  • Front HO2S deterioration
  • Front HO2S malfunction
  • Front HO2S looseness
  • Fuel pressure sensor malfunction
  • Clogged or restricted fuel line
  • Fuel leakage in the fuel line between the fuel delivery pipe and the fuel pump
  • Exhaust system leakage
  • Purge solenoid valve malfunction
  • Improper connection purge solenoid hose
  • Insufficient compression
  • Engine malfunction (Engine coolant leakage)
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.