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2003 Dodge Neon P0171 Code: Engine Starts with Starter Fluid but Fails to Start on Its Own

Model: 03 Dodge Neon Fault Code: P0171 Posted: 2017-10-20 19:03

My 2003 Dodge Neon won't start on its own, despite having a P0171 code indicating a lean air-fuel mixture. I've already replaced the throttle position sensor (TPS), mass airflow (MAP) sensors, intake filter, and idle air control (IAC) valve. After these replacements, the engine started several times. It cranks properly and can be temporarily started using starter fluid—running smoothly during such attempts. After resetting the ECU to relearn parameters and completing a 20-minute test drive, the P0170 code disappeared entirely while driving. However, the vehicle still fails to start independently under normal conditions. I rely on this car for work, so any insight into resolving this issue would be greatly appreciated.

Related fault codes
P0171
Comments (3)
Anonymous 2017-10-21 08:06

Low fuel pressure at startup could be a contributing factor. Consider checking the fuel pump and fuel filter.

Anonymous 2017-11-25 15:50

The check engine light has returned with code P1505, indicating the engine is running too lean. The Neon no longer starts on its own, though it still responds to starter fluid. I also have an oil pressure sensor fault—planning to replace that soon. How can I increase fuel pressure at startup? Any recommendations for troubleshooting?

Anonymous 2017-11-26 09:07

I recommend removing and replacing the fuel pump as a next step, especially given the P0171 code and starting issues.