Exhaust Back Pressure Sensor

An Engine Exhaust Back Pressure Sensor (EBP Sensor) is a component found primarily in diesel engines, especially those using exhaust gas recirculation (EGR) systems.

What is an Engine Exhaust Back Pressure Sensor (EBP Sensor)?

The EBP sensor measures the pressure in the exhaust system upstream (before) certain components like the turbocharger or diesel particulate filter (DPF). It’s usually located in the exhaust manifold or near the turbo.

Function 

 Monitors exhaust pressure: Helps determine how much exhaust gas is flowing.
 Assists EGR system: The EGR valve uses data from the EBP sensor to regulate how much exhaust gas gets recirculated back into the intake.
 Protects engine & components: Detects abnormal pressure, which can indicate restrictions or faults like a clogged DPF, failing turbo, or exhaust leaks.

Symptoms of a Failing EBP Sensor 

• Check engine light (CEL)
•  Poor fuel economy
•  Reduced engine power or “limp mode”
•  Rough idling or stalling
•  Increased exhaust smoke

Common Diagnostic Trouble Codes (DTCs) Related to EBP Sensors 

•  P0470: Exhaust Pressure Sensor Malfunction
•  P0471: Exhaust Pressure Sensor Range/Performance
•  P0472: Exhaust Pressure Sensor Low Input
•  P0473: Exhaust Pressure Sensor High Input

Maintenance and Troubleshooting 

•  Inspect EBP tube: These sensors often connect to a metal tube that can clog with soot.
•  Test sensor with a multimeter or scan tool: Compare readings against specifications.
•  Replace if faulty: Usually easy to swap, but be sure to clean or replace the associated tube.