DTC P0031: Front Ho2S Heater Circuit Low Input: Notes

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P0031 - Detection Conditions & Possible Causes

Courtesy of MAZDA MOTORS CORP.

Fig 2: DTC P0031 - Circuit Identification & Connector Views

Courtesy of MAZDA MOTORS CORP.