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DTC P2231: Heated Oxygen Sensor No. 1 - Signal Circuit Shorted To Heater Circuit: Condition

WARNING: This page is about a different car, the 2003 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when Engine Control Module (ECM) detects Heated Oxygen Sensor No. 1 (HO2S-1) output voltage is more than specified, and for more than specified time, even after starting engine. Possible causes are:

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