P0402 OBD II Trouble Code Exhaust Gas Recirculation (EGR) Flow Excessive Detected

Symptoms of P0402 OBD II Trouble Code

  • The DPFE (differential pressure) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (most likely carbon buildup)
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum

Common Causes of P0402 OBD II Trouble Code

  • Check the voltage at the DPFE sensor both at idle and when the EGR is open
  • Replace the DPFE sensor