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Exhaust Back Pressure Switches and Bungs

The Exhaust Back Pressure Switch, or Sensor, or EBP, is a butterfly valve on the down pipe side of the turbo exhaust housing, operated by oil pressure. It measures a diesel engine’s exhaust back pressure, particularly in cold temperatures. Back pressure is created to trap extra heat to help the engine warm up faster on cold starts. Readings from the Exhaust Back Pressure Switch are sent to the vehicle’s computer, or PCM, or Powertrain Control Module, to manage the engine’s performance.

We also have an extensive selection of exhaust Bungs & Plugs available in 303 Stainless Steel. Our exhaust Bungs & Plugs are made in house at our Screw Machine Facility (please insert hyperlink to Screw Machine Page) in Fruita, Colorado USA. We offer these individually, in standard or custom stocking kits, and in bulk. We also offer Custom Bungs & Plugs for any of your exhaust or special needs.

Common causes of Exhaust Back Pressure Switch failure:
• Wear & tear
• Tube going to the sensor is clogged with carbon

Symptoms of a failing Exhaust Back Pressure Switch may include:
• Poor fuel economy
• Slipping automatic transmission
• Engine backfiring

The following OBD II error codes are the most commonly found with this product type.
On-Board Diagnostic (OBD) systems are integrated into the computers of our vehicles to monitor emissions. The first generation of OBD requirements was implemented in California in 1988. Since then, these requirements were adopted by the US EPA for all passenger vehicles manufactured after 1996. In 2005, OBD systems then also became mandatory for heavy-duty vehicles and engines up to 14,000 lbs. GVWR. In 2008 the EPA finalized OBD regulations for 2010 and later heavy-duty engines used in highway vehicles over 14,000 lbs. GVWR and made changes to the OBD requirements for heavy-duty applications up to 14,000 lbs. GVWR to align them with requirements for applications over 14,000 lbs. GVWR.

OBD II is now the standard in diagnosing vehicle emissions in. The codes listed for this product type are common instances that may relate to your vehicle and should be used as a guide only. Walker Products will not be held responsible for any use of this information. It is highly suggested that you consult with a professionally trained mechanic prior to any automotive repair, and that you follow all vehicle manufacturer and EPA guidelines for removal, replacement, diagnostics, OBD II code clearing, ECU and PCM relearn procedures.

o P0470 Exhaust Pressure Sensor “A” Circuit
o P0471 Exhaust Pressure Sensor “A” Circuit Range/Performance
o P0472 Exhaust Pressure Sensor “A” Circuit Low
o P0473 Exhaust Pressure Sensor “A” Circuit High
o P0474 Exhaust Pressure Sensor “A” Circuit Intermittent/Erratic

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