From Ross-Tech Wiki

17525/P1117 - Oxygen (Lambda) Sensor Heating Circuit: B1 S2: Short to Ground

Possible Symptoms

  • Malfunction Indicator Light (MIL) ON

Possible Causes

  • Failed O2 sensor heater circuit
  • Wiring Harness issue
  • Failing ECM

Possible Solutions

  • Inspect and test O2 sensor heater circuit as per repair manual
  • Inspect and test wiring harness as per wiring diagram
  • Replace ECM if O2 sensor and wiring harness are to factory design