P2252: O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 1
What to do
Expect worse economy and reduced power. Ask for the harness to be inspected along its route rather than only at the sensor — a chafe against a bracket or the exhaust is the usual finding.
What this code means
The negative current control circuit reads below its valid range, normally a short to ground. Because this line is often a return path already referenced near ground, a short here can be subtle to find and is frequently a chafe against the exhaust or a bracket rather than an obvious fault.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Melted wiring against the exhaust · moderate
- Faulty oxygen sensor · moderate
Less common
- Damaged wiring harness · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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