DPFE Sensor Downstream Hose Off or Plugged
What it means
This is a Ford, Lincoln and Mercury code; the same number can mean something different on other makes. The computer sees the downstream DPFE hose, the one connected to the EGR tube after the metering orifice on the intake side, as disconnected or blocked. The repair is usually the hose or its port, not the EGR valve.
Models covered: Ford (and Lincoln/Mercury) models with a DPFE-type EGR system, mainly around 1996–2004.
Symptoms3
- Check engine light on.
- No noticeable change in most cases.
- Slightly rough idle at times if EGR control is upset.
Possible causes5
- Downstream hose disconnected from the sensor or the tube.
- Hose cracked or hardened by heat.
- Downstream tube port blocked with carbon.
- Hoses swapped.
- Failed DPFE sensor.
How to diagnose4
- Confirm each hose is on its correct port per the sensor markings and the manufacturer manual.
- Inspect the downstream hose for cracks or disconnection.
- Check the downstream tube port for carbon blockage.
- Watch the DPFE reading on a scan tool as the EGR valve opens and closes.
How to fix5
- Refit the hose on its correct port.
- Replace both hoses if cracked or hardened.
- Clean the blocked tube port.
- Replace the DPFE sensor if the reading stays wrong.
- Clear the code and confirm the EGR test passes.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The fix is usually a hose or port cleaning at low cost, rising to the top of the range when the sensor is replaced.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
What is the difference between P1405 and P1406?
Both concern the DPFE hoses, but P1405 is the upstream hose on the exhaust side and P1406 is the downstream hose on the intake side.
Should both hoses be replaced together?
It is best, since both face the same heat; if one has cracked, the other is usually close to failing.
This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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