DTC P0053:00: Notes

DTC P0053:00	A/F sensor heater resistance problem
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 30 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 PCM detects the above malfunctioning 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 PCM detects the above malfunction conditions 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 terminal malfunction Short to ground or open circuit in A/F sensor heater power supply circuit Short to ground in wiring harness between main relay terminal D and A/F sensor terminal A ENGINE 10 A fuse malfunction Open circuit in wiring harness between main relay terminal D and A/F sensor terminal A Short to ground in wiring harness between A/F sensor terminal E and PCM terminal 2A A/F sensor heater malfunction PCM connector or terminal malfunction Open circuit in wiring harness between A/F sensor terminal E and PCM terminal 2A PCM malfunction