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2003 Ford Taurus SES P0171 and P0174 Fault: Leaking Intake Hose Fix & Ford Recall Concerns

Model: 2003 Ford Taurus SES Fault Code: P0171 Posted: 2009-12-21 14:39

This issue has been resolved, but the root cause was a significant leak in the intake manifold hose. The problem is widespread across many 2003 Ford Taurus SES models, with numerous owners reporting water pooling on the passenger floor and subsequent fan motor failure. Ford has been paying for repairs in some cases—up to 80%—but not universally, which raises concerns about a potential recall. Given that hundreds of users online have reported similar symptoms, and considering the severity and frequency of failures, this appears to be a design defect rather than an isolated issue. The leak originated at the rubber grommet near the intake manifold, where a hose with a diameter of approximately one inch connects to the PCV system. This component is made from soft rubber and is prone to damage during routine oil changes when mechanics repeatedly loosen or manipulate it without proper procedure. Many users report frustration over such practices. I identified the leak by inspecting the engine bay, taped the damaged section securely, reinstalled the hose, and drove the vehicle afterward. The result: no idle issues, no stalling, and full engine performance restored—without costly repairs. This is a simple, low-cost fix that highlights how preventive maintenance and proper mechanic practices matter. I have since decided not to purchase another Ford due to this recurring defect and lack of proactive recall action.

Related fault codes
P0171P0174
Comments (3)
Anonymous 2010-01-21 21:32

I own a 2003 Ford Taurus SES and initially received the P0174 code. I followed advice to clean the MAF sensor, cleared the code, but it returned shortly after leaving my driveway. Upon further inspection of the engine compartment, I discovered a leaking hose at the top of the intake manifold—about one inch in diameter, connecting the intake to the PCV system. The rubber grommet near the manifold had a hole due to repeated abuse during oil changes. This soft rubber is not designed for constant wrenching. Many mechanics perform routine maintenance without proper procedures, which can lead to damage. I taped the leak securely, reinstalled it, and now my vehicle runs smoothly with no idle issues or stalling. A simple fix that saved me hundreds of dollars.

Anonymous 2010-01-21 22:36

My case was also caused by a leaking hose—agreed, the issue likely stems from repeated mechanical abuse during oil changes, especially at service centers where technicians may over-tighten or manipulate components unnecessarily.

Anonymous 2010-01-24 15:27

Owning a car involves some level of maintenance. While not all mechanics are dishonest, many do perform unnecessary work that can damage parts. I personally handle most repairs myself when possible to avoid such issues and ensure quality work is done.