P0031

O2 Sensor Heater Circuit Bank 1 Upstream Sensor - Short Circuit To Ground

P0031 - O2 sensor heater circuit bank 1 upstream sensor fault.: Last occurrence - minimum signal

Possible causes:
1. Short circuit C0604-19 (N) - ground.
2. Short circuit C0604-15 (B) - ground.
3. Connector C0604, C0644.
4. Oxygen sensor.


1. Short circuit C0604-19 (N) - ground.
SHORT_CIRCUIT
Check resistance < 5.0 Ohms.

2. Short circuit C0604-15 (B) - ground.
SHORT_CIRCUIT
Check resistance < 5.0 Ohms.

3. Connector C0604, C0644.
CONNECTOR
Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

4. Oxygen sensor.
No detail available for this fault