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Home >> Mazda >> 2000 >> Millenia Base, 2.5 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.5L >> Diagnostic Trouble Code Tests >> DTC P0134: Right Front Heated Oxygen Sensor, Insufficient Activity Detected >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID DATA have been recorded. Verify stored DTCs. If DTCs P0510 and/or P1402 are present, repair those DTC(s) first and go to step  8 . If DTCs P0510 and/or P1402are not present, go to next step.
  2. Verify if DTCs P0134, P0140 and/or P0154 are present in FREEZE FRAME PID DATA. If either DTC is present, go to next step. If neither DTC is present, repair DTC(s) present in FREEZE FRAME PID DATA and go to step  8 .
  3. Erase DTCs. See CLEARING CODES in appropriate SELF-DIAGNOSTICS - INTRODUCTION article. Referring to FREEZE FRAME PID DATA, operate vehicle for at least 2 minutes under same conditions as when DTC was set. Verify if DTCs P0134 and/or P0154 are present in PENDING TROUBLE CODE information. If either code is present, go to next step. If neither code is present, problem may be intermittent. Ensure all applicable connections are clean and tight.
  4. Using scan tool, access PID/DATA MONITOR. Record PID data for MAF V, ECT V and CTP SW. Compare readings with specifications. See PIN VOLTAGE/PID VALUE CHARTS article. If any data is not within specification, go to applicable test in appropriate SYSTEM & COMPONENT TESTING article. If all data is within specification, go to next step.
  5. Referring to FREEZE FRAME PID DATA, operate vehicle under same conditions as when DTC was set. Record PID data for MAF V, ECT V and CTP SW. Compare readings with specifications. See PIN VOLTAGE/PID VALUE CHARTS article. If any data is not within specification, go to applicable test in appropriate SYSTEM & COMPONENT TESTING article. If all data is within specification, go to next step.
  6. Using scan tool, access PID/DATA MONITOR. Monitor FHO2S R. Depress accelerator pedal to Wide Open Throttle (WOT) and release to race engine. Scan tool should display heated oxygen sensor voltage greater than .45 volt during rich condition and less than .45 volt during lean condition. If voltage is as specified, go to next step. If voltage is not as specified, replace heated oxygen sensor and retest.
  7. Inspect right front heated oxygen sensor heater. See DTC P0135: RIGHT FRONT HEATED OXYGEN SENSOR HEATER MALFUNCTION  . Repair as needed and go to next step. If heated oxygen sensor heater is functioning correctly, go to next step.
  8. INTRODUCTION article. Conduct drive cycle mode No. 3 under DRIVE CYCLE PROCEDURE. See appropriate SELF-DIAGNOSTICS - INTRODUCTION article. Verify if any DTCs are stored or are present in PENDING TROUBLE CODE information. If no DTCs are present, testing is complete. If any DTCs are present, go to applicable test and repair.
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