Code Definition

P1184 — Heated Oxygen Sensor 1 bank 1 no activity

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

About P1184

P1184 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 P1184 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.

P1184 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 upstream heated oxygen sensor on Bank 1 Sensor 1 should switch continuously between roughly 0.1 volt and 0.9 volt once the engine reaches closed loop operation. DTC P1184 is set on Hyundai and Kia vehicles when the Engine Control Module sees no activity from this sensor, meaning the signal stays flat and fails to switch when it should be responding to mixture changes. A no activity fault typically means the sensor element is dead, the heater is not bringing it to operating temperature, or an open circuit is preventing the signal from reaching the ECM. The engine may stay in open loop with ...

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