What Does P1405 Mean?
The DPFE (Differential Pressure Feedback EGR) sensor upstream hose circuit has detected an abnormal signal. This sensor monitors pressure differences to verify proper EGR flow, and the upstream hose connection or circuit is faulty.
Common Causes
35%
DPFE sensor upstream hose disconnected, cracked, or blocked
30%
DPFE sensor failure or internal malfunction
20%
Carbon buildup blocking EGR passages or sensor ports
10%
Wiring harness damage or poor connector at DPFE sensor
5%
PCM internal fault in DPFE sensor circuit driver
Diagnostic Steps
1
Step 1: Visually inspect DPFE sensor upstream hose for disconnection, cracks, or blockage
2
Step 2: Check electrical connector at DPFE sensor for corrosion, damage, or proper seating
3
Step 3: Test DPFE sensor voltage signal at sensor connector using multimeter (typically 0.5-4.5V range)
4
Step 4: Inspect EGR valve and passages for carbon buildup restricting flow
5
Step 5: If all hoses and connections are intact, replace DPFE sensor and retest
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The DPFE (Differential Pressure Feedback EGR) sensor upstream hose circuit has detected an abnormal signal. This sensor monitors pressure differences to verify proper EGR flow, and the upstream hose connection or circuit is faulty.
The most common cause of P1405 (Differential Pressure Feedback Electronic Sensor circuit Upstream Hose) is: DPFE sensor upstream hose disconnected, cracked, or blocked
Typical repair costs for P1405 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may cause increased emissions and potential engine performance issues. Repair within a week to prevent catalyst damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1405 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System (EGR)
Difficulty
Type
Manufacturer
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