Code Definition

P0059 — HO2S Heater Resistance (Bank 2 Sensor 1)

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

About P0059

P0059 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 P0059 is stored, the module has detected 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 P0059 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 P0059 code indicates an issue with the heater element's resistance in the oxygen sensor identified as Bank 2 Sensor 1. This sensor is an upstream sensor, positioned before the catalytic converter. The Engine Control Module (ECM) triggers this code when it detects that the resistance of the heater element in the oxygen sensor is outside the specified range. The heater is essential for quickly bringing the oxygen sensor to its operational temperature, ensuring accurate monitoring of the air-to-fuel ratio in the exhaust gases.

Quick Facts