DTC P2245:00: Notes

DTC P2245:00	A/F sensor reference voltage circuit low input
DETECTION CONDITION	The PCM monitors the A/F sensor reference voltage circuit voltage. If the voltage below the threshold value while the engine is running, the PCM determines that the A/F sensor reference voltage circuit is low. Diagnostic support note This is a continuous monitor (A/F sensor, HO2S). The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	-
POSSIBLE CAUSE	A/F sensor connector or terminals malfunction A/F sensor malfunction Short to ground in reference voltage circuit at A/F sensor Short to ground in wiring harness between A/F sensor terminal 2C and PCM terminal 2Y PCM connector or terminals malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.