2004 Ford Taurus Check Engine Light with P0174 Code: Causes, Fix, and Where to Buy Parts Cheaply
After a routine oil change today, my 2004 Ford Taurus suddenly triggered the check engine light. A diagnostic at the dealership revealed code P0174 — indicating a lean condition in Bank 2 of the fuel system. They identified a leaking air intake valve as the root cause and recommended repair. I'm concerned about how serious this issue is, what role the air intake valve plays, and whether it should be fixed immediately. Additionally, I'd like to know where I can source the part (P/N 87072S91) more affordably than dealership prices, as labor and parts are estimated at around $460. Can anyone confirm if this is a critical issue or something that can be safely delayed? Any DIY tips or trusted online suppliers for replacement gaskets would also be greatly appreciated.
It's not uncommon to see a check engine light appear right after an oil change, especially if there's a vacuum leak. I strongly recommend checking common leak points such as the PCV valve and its hoses, air filter housing, and intake ducting — these are often overlooked during routine maintenance. Try this simple DIY test: use a smoke machine or soapy water to check for leaks around the intake system. If you find a vacuum leak, it could be causing the P0174 code. For parts, consider checking NAPA or other auto part retailers — they often carry the gasket (P/N 8 or 87072S91) at lower prices than dealerships. See this helpful thread for more details: http://www.taurusowners.com/topic/2126-...ol-vulcan/