P164A FORD - O2 Sensor Positive Current Trim Circuit Performance Bank 1 Sensor 1
- Faulty Universal HO2S
- Universal HO2S harness is open or shorted
- Universal HO2S circuit poor electrical connection
Tech notesThere is a factory service bulletin for the following Ford models:
2011-2012 F-Super Duty
2011-2012 Ford F-Super Duty Factory Service Bulletin OBDII Code P164A
- Engine Light ON (or Service Engine Soon Warning Light)
P164a Ford DescriptionA resistor is installed in the universal Heated Oxygen Sensor (HO2S) connector for part to part variance. The Powertrain Control Module (PCM) determines the value of this resistor by taking multiple measurements of the resistor during each ignition ON event. The PCM uses this value in order to compensate for the variance in the pumping current signal. The test fails if the PCM receives an inconsistent or erratic measurement of the resistor.
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