Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Powertrain DTC Charts and Descriptions 4-139
Diagnostic Trouble Code (DTC) Charts and Descriptions
P2626 - O2 Sensor Positive Current Trim Circuit/Open (Bank 1 Sensor 1) (Continued)
Possible Causes: • Corrosion
• Incorrect connections
• UO2SPCT11 circuit open
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DZ.
P2627 - O2 Sensor Pumping Current Trim Circuit Low Bank 1, Sensor 1
Description: A resistor is installed in the universal heated oxygen sensor (HO2S) connector for part to part variance. The
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. This DTC sets when the PCM determines the resistance value is too high.
Possible Causes: • UO2SPCT11 circuit open
• UO2SPCT11 circuit short to ground
• Contaminated universal heated oxygen sensor bank 1, sensor 1 (HO2S11)
• Damaged universal HO2S11
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DZ.
P2628 - O2 Sensor Positive Current Trim Circuit High (Bank 1 Sensor 1)
Description: This DTC sets when a concern is detected with the circuit used to determine the oxygen content in the exhaust
gas.
Possible Causes: • UO2SPCT11 circuit short to voltage
• Damaged universal heated oxygen sensor bank 1, sensor 1 (HO2S11)
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DZ.
P2629 - O2 Sensor Positive Current Trim Circuit/Open (Bank 2 Sensor 1)
Description: During deceleration fuel shut-off (DFSO) the PCM monitors the integrity of the UO2SPCT21 circuit by
comparing the actual oxygen sensor voltage signal to an expected oxygen sensor voltage signal. This DTC sets when the actual oxygen sensor voltage exceeds the maximum expected voltage threshold for a specified amount of time.
Possible Causes: • Corrosion
• Incorrect connections
• UO2SPCT21 circuit open
Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test DZ.
P2630 - O2 Sensor Pumping Current Trim Circuit Low Bank 2, Sensor 1
Description: A 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. This DTC sets when the PCM determines the resistance value is too high.
Possible Causes: • UO2SPCT21 circuit open
• UO2SPCT21 circuit short to ground
• Contaminated universal heated oxygen sensor bank 2, sensor 1 (HO2S21)
• Damaged universal HO2S21
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.