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HOMESERVICE MANUALSMAZDA2006B4000 BASE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE SYMPTOM TROUBLESHOOTING - (3 OF 5)DTC APPLICATION CHART - POWERTRAIN CONTROL MODULE (PCM)HO2S HEATER (S)
2006 Mazda B4000 Base, Automatic

Ho2S Heater (S)

2006 Mazda B4000 Base, AutomaticSECTION Ho2S Heater (S)
DTC P1127 DETECTION CONDITION & POSSIBLE CAUSES

DTC P1127 HEATED OXYGEN SENSOR (HO2S) HEATER(S)
DETECTION CONDITION 
  • P1127 indicates that the inferred exhaust temperature to determine when HO2S heaters are cycled on is below a minimum calibrated value.
POSSIBLE CAUSE 
  • Engine not operating long enough prior to performing KOER self-test
  • Exhaust system too cool
DTC P1127 DIAGNOSTIC PROCEDURE

DTC P1127 HO2S HEATER(S)
STEP INSPECTION ACTION
1 KOER P1127
  • Connect WDS or equivalent tester.
  • Key on, engine off (KOEO).
  • Access the following PIDs.
    • HTR11 (front RH)
    • HTR21 (front LH)
    • HTR12 (rear)
  • Key OFF.
  • Do all PIDs Indicate ON? 
 Yes Engine still operating.
Perform KOER self-test. See ON - BOARD DIAGNOSTIC TESTS .
No Operate the engine until all PIDs indicate ON. Perform KOER self-test. See ON - BOARD DIAGNOSTIC TESTS .
RENDER: 1.0x

NO RELATED

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

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