Possible Causes
WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
Malfunction is detected when:
- DTC P0405
An excessively low voltage from EGR temperature sensor is sent to ECM even when engine coolant temperature is low. - DTC P0406
An excessively high voltage from EGR temperature sensor is sent to ECM even when engine coolant temperature is high.
Possible causes are:
- EGR temperature sensor circuit open or shorted.
- Defective EGR temperature sensor.
- Malfunction of EGR function.
NOTE:
Perform the following DTC confirmation tests in order. If a DTC confirmation test has been previously performed, turn ignition off and wait at least 10 seconds before performing next DTC confirmation test.