P1151 FORD - LACK OF UPSTREAM HEATED OXYGEN SENSOR SWITCH INDICATES LEAN BANK 2
POST UPDATED IN January, 2023
P1151 FORD - LACK OF UPSTREAM HEATED OXYGEN SENSOR SWITCH INDICATES LEAN BANK 2
An integrated strategy known as O2 Sensor Monitoring is used to check that the Oxygen (O2) Sensors are working properly. In some cases, the fuel control or upstream O2 sensors are adjusted so that the output voltage and response rate (switching time from rich to poor or vice versa) are appropriate. Similarly, the downstream O2 sensors are used for Catalyst Monitor. With this data, the output voltages are determined and controlled so that they are as required.
To enable the HO2S monitor, it is necessary to have inputs for coolant temperature (ECT), head temperature, intake air, mass airflow (MAF), throttle position (TPS), and crank position (CKP). Besides, you must complete fuel system monitor and misfire detection monitor tests. Once the HO2S monitor is enabled, the voltage amplitude of the upstream sensor signal is checked, as well as the response of the sensor. To check if the voltage is excessive, it is compared to a calibrated maximum voltage. If an oxygen sensor indicates there is a slope after a test, the system tries to fix it.
The fault code P1151 OBDII is only for Ford vehicles. It is set when the fuel control system does not detect the switching for a certain calibrated time.
Reasons to set the diagnostic code P1151 OBD2:
Steps to correct the DTC code P1151 OBDII on your Ford vehicle: