P0028 OBD2 Error Code in 2011 Mazda CX9: Symptoms and Diagnosis
I recently received a P0028 diagnostic error code from my OBD2 scanner on a 2011 Mazda CX9. The vehicle exhibits no movement when shifted into Drive (D) or Reverse (R), and the engine RPM drops significantly during these gear changes. I'm seeking advice on how to properly diagnose and resolve this issue, especially since the P0028 code is linked to an exhaust valve position sensor malfunction. Please share any insights or troubleshooting steps for this specific model and error code.
The P0028 code indicates a problem with the exhaust side of the thermostat, specifically related to the exhaust valve position sensor. It's possible that the issue is not isolated—there may be additional underlying problems. Always ensure your OBD2 scanner reads all stored trouble codes and clears them after diagnosis to verify if the error recurs. For detailed technical information on P0028, refer to: https://www.obd-codes.com/p0028