P1406 — Differential Pressure Feedback Electronic Sensor Circuit Downstream Hose

What Does P1406 Mean?

P1406 is a manufacturer-specific diagnostic trouble code: Differential Pressure Feedback Electronic Sensor Circuit Downstream Hose. This code applies to FORD, LINCOLN, MERCURY, OTHER, BMW vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1406

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Differential Pressure Feedback Electronic Sensor readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Differential Pressure Feedback Electronic Sensor circuit (damaged, chafed, or corroded)
🔍 Faulty Differential Pressure Feedback Electronic Sensor connector or terminal
🔍 Failed Differential Pressure Feedback Electronic Sensor
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P1406 mean?

P1406 indicates: Differential Pressure Feedback Electronic Sensor Circuit Downstream Hose. The vehicle's computer has detected that the Differential Pressure Feedback Electronic Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1406?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1406 for extended periods may cause additional problems.

How much does it cost to fix P1406?

Repair costs for P1406 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Differential Pressure Feedback Electronic Sensor wiring and connectors
🔧 Replace faulty Differential Pressure Feedback Electronic Sensor

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1406: Differential Pressure Feedback Electronic Sensor Circuit Downstream Hose