DTC P0053:00: Notes

DTC P0053:00	A/F sensor heater resistance
DETECTION CONDITION	The PCM monitors the A/F sensor heater resistance when under the A/F sensor heater control. If the resistance is more than 47.34 ohms or less than 1.23 ohms , the PCM determines that there is a A/F sensor circuit problem. Diagnostic support note This is an intermittent monitor (A/F sensor heater, HO2S heater). The MIL 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.
POSSIBLE CAUSE	A/F sensor connector or terminals malfunction A/F sensor heater malfunction Short to ground in wiring harness between the following terminals: A/F sensor terminal C-PCM terminal 2I A/F sensor terminal D-PCM terminal 2X PCM connector or terminals malfunction Open circuit in wiring harness between the following terminals: A/F sensor terminal C-PCM terminal 2I A/F sensor terminal D-PCM terminal 2X PCM malfunction