DTC B1100-15: O2 sensor heater relay - Circuit short to battery or open: Action
- Refer to the applicable system wiring diagram(s) and check the upstream heated exhaust gas oxygen sensor relay control circuit - Circuit reference UHEGO_RLY_CTRL - For short circuit to power, open circuit, high resistance
- If no wiring faults are present, check and install new upstream heated exhaust gas oxygen sensor relay as required. Clear DTC and retest