2006 Mazda MX-5 Miata BaseFACTORY OEM SERVICE PROCEDURE

DTC P0134: Notes

DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0134)

DTC P0134 Front HO2S no activity detected
DETECTION CONDITION 
  • The PCM monitors the front HO2S element impedance when the following conditions are met. If the front HO2S element impedance is 80 ohms  or more, the PCM determines that front HO2S is not activated.

    MONITORING CONDITIONS 

    • HO2S, HO2S heater and TWC Repair Verification Drive Mode
    • Following conditions are met
  • Time from engine start is above 30 s  (ECT when engine start is 20°C {68°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.
  • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • Front HO2S deterioration
  • Front HO2S heater malfunction
  • Open circuit or short to ground in wiring harness between front HO2S terminal A and PCM terminal 2AD
G04317710Courtesy of MAZDA MOTORS CORP.
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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.