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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Controls - Powertrain DTC Charts & Descriptions (Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P2251 - O2 Sensor Negative Current Control Circuit Open - Bank 1, Sensor 1
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DTC P2251 - O2 Sensor Negative Current Control Circuit Open - Bank 1, Sensor 1

WARNING: This page is about a different variant/trim than selected.
P2251 - O2 SENSOR NEGATIVE CURRENT CONTROL CIRCUIT OPEN - 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: 
  • UO2SGREF circuit open
  • Damaged universal heated oxygen sensor (HO2S)
Diagnostic Aids: 
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All All GO to PINPOINT TEST DZ .
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