P1138 MAZDA Possible Causes
- Faulty rear O2 sensor
- Rear O2 sensor harness is open or shorted
- Poor electrical connection in rear O2 sensor circuit
How to Fix Code P1138 MAZDA?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Check Engine Light on (or service engine soon warning light)
P1138 MAZDA Meaning
Rear O2 Sensor Self-Test Error is the generic description for Mazda code P1138, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Mazda OBDII P1138 code.