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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1127: Ho2S Heater >> Possible Causes

Possible Causes

Possible causes are:

Engine not operating long enough prior to performing KOER self-test.
Exhaust system too cool.

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