Code Definition

P1117 — O2S Sensor Heater Circuit Short To Ground Bank 1 Sensor 2

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

About P1117

P1117 is a manufacturer-specific powertrain diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1117 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; 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.

P1117 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

This fault code indicates the Engine Control Module (ECM) has detected a short to ground in the heater circuit of the downstream oxygen sensor on Bank 1 Sensor 2, the sensor located after the catalytic converter. This sensor heater brings the element up to operating temperature quickly so the ECM can monitor catalytic converter efficiency accurately. When the heater control or feed wire shorts to ground, the ECM detects abnormal current on the circuit and sets this code. Effects include delayed catalyst monitor readiness, a steady check engine light, and potentially a blown heater fuse, while ...

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