DTC P0135: O2 Heater Circuit (Bank 1, Sensor 1)

WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 2013 Lincoln Navigator, 2013 Lincoln MKZ, 2013 Lincoln MKX, 2013 Lincoln MKT, and 2013 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0135: O2 HEATER CIRCUIT (BANK 1, SENSOR 1)

Description:	This DTC sets when an open or short circuit is detected or the HO2S heater current draw exceeds a calibrated limit.
Possible Causes:	UO2SHTR circuit open (if equipped) UO2SHTR circuit short to voltage (if equipped) HO2S HTR11 circuit open (if equipped) HO2S HTR11 circuit short to voltage (if equipped) VPWR circuit open GND circuit open Low battery voltage Water in the harness connector Corrosion Incorrect connections Damaged HO2S heater Damaged universal HO2S heater
Diagnostic Aids:	Inspect the connectors for signs of damage, water ingress, or corrosion.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Fiesta, Transit Connect	GO to PINPOINT TEST DW .
All others	GO to PINPOINT TEST DZ .