Code Definition

P013B — Oxygen sensor signal slow to change from lean to rich - Bank 1 - sensor 2

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

About P013B

P013B 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 P013B 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 P013B 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

This fault code is activated when the engine control module (ECM) identifies that the oxygen (O2) sensor in Bank 1, Sensor 2, is responding slowly during the transition from a lean to rich condition. This condition indicates a delayed reaction of the sensor to changes in the exhaust gas composition, pointing towards a potential sensor degradation, contamination, or malfunction. It could also reflect issues in the exhaust or fuel system that are affecting the sensor's ability to accurately detect changes in the air-fuel mixture. Bank 1 Sensor 2 is typically located post-catalytic converter and ...

Join TaT to view the complete code information and diagnostic details.

Quick Facts