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P1406 - Exhaust Gas Recirculation Position Sensor Performance

Possible causes
- Downstream hose is disconnected
- Downstream hose is plugged (ice)
- Plugged or damaged Exhaust Gas Recirculation (EGR) tube
- Faulty Differential Pressure Feedback Electronic (DPFE) sensor
- Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted
- Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1406 Description

The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. This is done by redirecting small amounts of exhaust gas back through the upper intake to get mixed in with the air/fuel charge. The resultant diluted air/fuel mixture (i.e., less oxygen per cubic foot) burns cooler and combustion chamber temperatures are reduced accordingly, thereby lowering NOx emissions.

The Ford DPFE/EGR system is controlled by the Powertrain Control Module (PCM). The system employs an EGR Valve, an Electronic Vacuum Regulator (EVR), and a Delta Pressure Feedback EGR sensor (DPFE).

The DPFE Sensor measures EGR flow across an orifice located inside the special EGR Tube. The orifice is positioned between two hose ports coming off the tube which are connected to the DPFE sensor with special heat-resistant hoses. When the EGR Valve is open, a pressure differential is created across the orifice (intake manifold pressure vs. exhaust pressure). By design, this difference in pressure is measured by the DPFE sensor in terms of voltage. The DPFE voltage signal output to the PCM is directly proportional to the flow of exhaust gas entering the intake manifold.

P1406 Information for specific makes
P1406 ACURA Exhaust Gas Recirculation Valve Position Sensor Circuit Problem
P1406 AUDI EGR Temperature Sensor Signal Range Performance
P1406 BMW Heated Catalyst Internal Control Module Checksum/ROM Error
P1406 BUICK EGR Valve Pintle Position Circuit
P1406 CADILLAC EGR Valve Pintle Position Circuit
P1406 CHEVROLET EGR Valve Pintle Position Circuit
P1406 DODGE Intermittent Loss Of Camshaft Position Or Crankshaft Position Sensor
P1406 FORD DPFE Sensor Circuit Downstream Hose
P1406 GMC EGR Valve Pintle Position Circuit
P1406 HONDA Exhaust Gas Recirculation Valve Position Sensor Circuit Problem
P1406 ISUZU EGR Valve Pintle Position Circuit
P1406 LINCOLN DPFE Sensor Circuit Downstream Hose
P1406 MAZDA DPFE Downstream Hose Off Or Plugged
P1406 MERCURY DPFE Sensor Circuit Downstream Hose
P1406 PONTIAC EGR Valve Pintle Position Circuit
P1406 SATURN EGR Valve Pintle Position Circuit
P1406 TOYOTA Turbo Pressure Sensor Range/Performance Problem
P1406 VOLKSWAGEN EGR Temperature Sensor Signal Range Performance
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