Code Definition

P1168 — Heated Oxygen Sensor 2, bank 1 circuit fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Hyundai

About P1168

P1168 is a manufacturer-specific powertrain diagnostic trouble code recorded for Hyundai vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1168 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.

P1168 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The downstream heated oxygen sensor on Bank 1 Sensor 2 sits after the catalytic converter and is used by the Engine Control Module mainly to monitor catalyst efficiency rather than to control fuel. DTC P1168 is set on Hyundai and Kia vehicles when the ECM detects an electrical fault in this Sensor 2 circuit, such as an open, a short, or a signal that stays outside the expected voltage range. Because a healthy downstream sensor normally sits at a fairly steady mid range voltage once warm, a circuit fault shows up as a flat line stuck high, stuck low, or biased to the reference value. The main c...

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