Code Definition

P0158 — Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 2)

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

About P0158

P0158 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 P0158 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 P0158 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 P0158 code is set when the Engine Control Module (ECM) detects a higher than expected voltage from the Bank 2, Sensor 2 oxygen sensor, generally above about 0.9 volts held for an extended period. This is the downstream sensor located after the catalytic converter on the cylinder bank that does not contain cylinder number 1. A high signal indicates low oxygen in the exhaust, consistent with a rich air fuel mixture, a contaminated sensor, or a signal circuit shorted to voltage or to the reference. The malfunction indicator lamp is usually illuminated, and while the engine may run without obv...

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