P2440moderate severityPowertrain
Secondary Air Injection System Switching Valve Stuck Open Bank 1
on 2018 Lincoln MKX 2.7L EcoBoost V6 · AWD
What this code means
The secondary air injection switching valve on bank 1 is stuck in the open position.
Symptoms
- Check engine light
- Failed emissions test
- Noise from air injection system
Common causes
- Carbon deposits in valve
- Failed diaphragm
- Broken valve spring
- Vacuum supply issue
Diagnostic steps
- Inspect valve operation
- Check vacuum supply
- Listen for air injection noise at idle
Repair notes
Replace secondary air switching valve.
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