P0401 Toyota Exhaust Gas Recirculation Flow Insufficient Detected
Possible causes
– EGR solenoid valve harness is open or shorted
– EGR solenoid valve circuit poor electrical connection
– EGR volume control valve stuck closed
– Dead (Weak) battery
– Faulty EGR temperature sensor and circuit
– Faulty EGR Valve
– EGR passage clogged
– Exhaust gas leaks
– EGR solenoid valve circuit poor electrical connection
– EGR volume control valve stuck closed
– Dead (Weak) battery
– Faulty EGR temperature sensor and circuit
– Faulty EGR Valve
– EGR passage clogged
– Exhaust gas leaks
Tech description
EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages.
What about the obd code?
– Low EGR flow control is detected
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Possible engine hesitation
– Possible engine hesitation
P0401 Toyota Description
Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control