The P0405 trouble code is associated with Exhaust Gas Recirculation (EGR) Sensor “A” Circuit Low, indicating that the electrical signal from the EGR sensor is below the expected range.
Exhaust Gas Recirculation Sensor “A” Circuit Low
Code symptoms P0405.
1. Illuminated “Check Engine” or “Service Engine Soon” light on the dashboard.
2. Poor engine performance.
3. Increased emissions.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0405.
1. Wiring or connection issues in the EGR sensor circuit.
2. Faulty EGR sensor.
3. Problems with the Engine Control Module (ECM).
Code Solutions P0405.
1. Inspect and, if necessary, repair any faults in the wiring or connections of the EGR sensor circuit.
2. Check and, if needed, replace the malfunctioning EGR sensor.
3. If ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.