P0134 1/1 O2 Sensor Stays at Center

SYMPTOM
P-0134 O2 SENSOR 1/1 STAYS AT CENTER

WHEN MONITORED
With the engine running for more than 2 minutes and engine temperature greater than 170 degrees.

SET CONDITION
The upstream oxygen sensor signal voltage is between 0.35 volt and 0.55 volt for 1.5 minutes.

POSSIBLE CAUSES
- O2 sensor 1/1 ground circuit open
- O2 sensor 1/1 signal circuit open
- O2 sensor 1/1 wiring harness intermittent defect
- O2 sensor 1/1 wiring harness observable defect
- O2 sensor 1/1 connector observable defect
- O2 sensor defective
- PCM defective