P2254: O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1
What to do
Expect worse economy and reduced power. If P2251 is stored as well, ask for the shared return path to be checked before either sensor is replaced — one break commonly produces both codes, and two wideband sensors is an expensive way to find that out.
What this code means
An open negative current control circuit on the second bank's upstream sensor. The circuit pair and the shared-return warning are at P2251, and this is the code where that warning most often pays off — because it is the combination of this and P2251 together that looks like two failed sensors and is usually one broken return.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Corroded or loose connector · easy
- Faulty oxygen sensor · moderate
Less common
- Poor module ground connection · moderate
- Damaged wiring harness · moderate
Symptoms
Components involved
Information, not instruction
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Community experience
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