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Home >> Pontiac >> 2004 >> Vibe GT >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System Diagnosis (DTC P0010 To DTC P0128) -- 1.8L (LV6)) >> Diagnosis >> DTC P0038 >> Circuit Description

Circuit Description

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The DTC P0038 Heated Oxygen Sensor (HO2S) Heater Control Circuit High Voltage Sensor 2 diagnostic monitors the operation of the HO2S 2 heater circuit. The heaters in the oxygen sensors increase the amount of time the sensor spends in Closed Loop fuel control operation or catalyst monitoring operation. The oxygen sensor heater is required by the post-catalyst HO2S 2 in order to maintain the high operating temperatures. The heater helps provide accurate oxygen content readings of the engine exhaust by the HO2S.

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