P0134moderate severityPowertrain
O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1
on 2018 Lincoln MKX 2.7L EcoBoost V6 · AWD
What this code means
The upstream O2 sensor on Bank 1 shows no switching activity - the signal is flat.
Symptoms
- Check Engine Light
- Poor fuel economy
- Rich or lean running
- Failed emissions
Common causes
- Faulty O2 sensor
- Open heater circuit
- Wiring issue
- Exhaust leak
- Fuel system problem preventing closed loop
Diagnostic steps
- Check O2 sensor voltage (should not be stuck)
- Test heater circuit
- Inspect wiring
- Check for exhaust leaks
Repair notes
Replace O2 sensor. Check heater circuit and wiring first.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1