P1404
IAT - B Circuit Malfunction/ Exhaust Gas Recirculation Closed Position Performance
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–67 (est.)
Symptoms
- Check Engine Light Is On
- Deterioration in acceleration dynamics
- Increased fuel consumption
- Unstable engine operation at idle
- Increased emissions of harmful substances
Causes
- Intake air temperature (IAT) sensor malfunction
- Open or short circuit in the sensor circuit
- EGR valve stuck closed
- EGR solenoid valve malfunction
- Wiring Harness Problems
How to Fix
- Check the condition of the intake air temperature sensor
- Check the integrity of the wiring to the EGR sensor and valve
- Clean or replace EGR valve
- Check the operation of the EGR valve actuator
- Scan the system for other errors