Code Definition

P1134 — Heated Oxygen Sensor 1 bank 1 - slow response

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

About P1134

P1134 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 P1134 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.

P1134 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 (HO2S) for Bank 1 Sensor 1 switches rapidly between rich and lean as the Engine Control Module cycles fuel around the stoichiometric point. DTC P1134 is set on Hyundai and Kia vehicles when this sensor responds too slowly, its switching frequency and transition speed falling below the threshold the ECM expects during closed loop operation. A slow or lazy sensor most often results from age, contamination, or a heater circuit that fails to bring the element up to operating temperature quickly. When set, the code can cause poor fuel control, increased emissions, ...

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