2004 Nissan Sentra P0420 P0731 P0732 Fault Codes - Car Runs Poorly with Stalling and Shaking
My son's 2004 Nissan Sentra Limited Edition (1.8L engine, automatic transmission) is showing three diagnostic trouble codes: P0420, P0731, and P073-32. The car starts and runs but performs very poorly—experiencing severe stalling, shaking, and hesitation during operation. It seems like the engine is flooding with excessive fuel. I need help diagnosing these issues to determine their root causes and possible fixes. The P0420 code suggests a catalytic converter efficiency problem, while P0731 and P0732 indicate transmission-related issues such as incorrect gear ratios or sensor malfunctions.
The P0731 and P0732 codes are related to the transmission system, indicating potential issues with gear ratio sensing or shift execution. If the vehicle still has an active warranty, it may be worth contacting the manufacturer or dealer for coverage on these repairs.