O2 Sensor Signal Plausibility

Test 1 - Test 4:

Test 5 - Test 8:

Test 9:

SYMPTOM
P2091-O2 SENSOR SIGNAL PLAUSIBILITY

TEST NOTE
This symptom is diagnosed using the test P2026-O2 SENSOR CIRCUIT FAULT.

POSSIBLE CAUSES
- Checking circuit integrity
- ECM
- O2 sensor
- O2 sensor circuit short to ground
- O2 sensor circuit short to voltage
- O2 sensor circuit short together
- O2 sensor open circuit
- Power supply open
- Intermittent condition