Code Definition

P2252 — O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 1

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2252

P2252 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2252 is stored, the module has detected a signal or supply voltage lower than the expected operating range; a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2252 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Bank 1 sensor 1 is the upstream wide band air fuel ratio sensor, which uses a pump cell controlled by positive and negative current circuits so the engine control module can measure the exact exhaust mixture. DTC P2252 sets when the ECM detects the voltage on the negative current control circuit of this sensor is lower than expected, which points to an open circuit, a short to ground, or an internal sensor fault. Because this circuit is essential to the sensor producing an accurate reading, a fault disrupts closed loop fuel control. When the code is set the ECM may run open loop, causing poor ...

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