P0320 Diagnostic and Fixes for 1997 Jeep Grand Cherokee

Model: 1997 Jeep Grand Cherokee Fault Code: P0320 Posted: 2011-08-05 08:27

The check engine light has reappeared on my 1997 Jeep Grand Cherokee, now displaying a P032-than code. Previously, the vehicle showed a P0455 code indicating a significant evaporative emissions system leak. I have already replaced the gas cap twice and the fuel pump (which was a separate issue). Additionally, the purge solenoid and a vacuum line nipple were replaced. During recent operation, the check engine light reactivated with a P0320 error. What are the most common causes of this code? Which components should I inspect or replace to resolve it? Please provide practical troubleshooting steps for this specific model year and application.