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The 2003 Dodge Neon has a bad reputation for problems with its EVAP system, so it makes sense that you're curious about where to find the canister purge valve. This valve, made of plastic, is prone to leaks or malfunctions, making it a likely culprit for a small EVAP leak, especially if you've already checked for a loose gas cap or a corroded fuel filler neck. To locate the canister purge valve, you'll need to look near your fuel pump. It's a small, black plastic cylinder, and the good news is that it's relatively inexpensive. You can expect to pay under $70 for a replacement, including tax, and it should only take you a few hours to install it yourself. In contrast, a professional repair shop would charge around $250 for both parts and labor.
The 2003 Dodge Neon's evap canister, also called the purge valve, is situated above the back of the muffler.