Code Definition

P2253 — Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1)

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

About P2253

P2253 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2253 is stored, the module has detected a signal or supply voltage higher 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 P2253 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

The engine control module (ECM) sets P2253 when it detects a high voltage condition in the reference ground circuit of the air-fuel ratio (A/F) sensor or oxygen (O2) sensor for Bank 1, Sensor 1. This indicates improper grounding, which can cause incorrect sensor readings and disrupt air-fuel mixture adjustments. A high voltage condition may result from an open circuit, wiring issues, or a faulty sensor.

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