2009 Dodge Avenger RT 3.5L V6 P0301 OBD2 Fault Code: Causes, Diagnosis & Fixes

Model: 2009 Dodge Avenger RT Fault Code: P0301 Posted: 2019-11-23 16:08

I own a 2009 Dodge Avenger RT with a 3.5L V6 engine and have accumulated 146,000 miles. The vehicle generally runs smoothly, but it has intermittently triggered OBD2 fault code P0301 over the past several years. The code appears suddenly—without warning—and then disappears just as quickly, often returning after repairs. I've already had the vehicle inspected by multiple mechanics and have replaced spark plugs, coil packs, fuel injectors, and other related components. However, the P0301 code reappears unexpectedly. Is it possible that the engine control module (ECM) is faulty? I’ve tested the Mass Air Flow Sensor (MAFS), and removing it does not affect performance—indicating the issue isn't in airflow or sensor readings. What could be causing this persistent, intermittent P0301 code? Are there any specific diagnostic steps or underlying causes that are commonly missed when troubleshooting this fault?