Ford Flex Engine Oil Pressure Switch Guide for 2009-2019 Models
Is your oil light on even when the oil level is full? Your oil pressure switch might be the problem.
- Never ignore an oil pressure light; if it's on and you hear engine noise, stop immediately.
- A common failure on the Flex is the switch leaking oil through its electrical connector; check for this first.
- For the non-turbo 3.5L engine, replacing the switch is a simple DIY job with basic tools.
- Both Motorcraft (OEM) and Standard Ignition (aftermarket) are reliable brand choices for this part.
Is It a Bad Switch or a Bigger Problem?
The most important thing to understand is the difference between a bad oil pressure switch and actual low oil pressure. A bad switch sends a false signal. This means your engine's oil pressure is likely fine, but the switch is telling the car's computer it isn't. Actual low oil pressure is an emergency that can destroy your engine in minutes.
Warning: Never ignore an oil pressure warning light. If the light comes on and you hear any new engine noises like knocking, ticking, or grinding, stop the car immediately and have it towed. Driving could cause catastrophic engine failure.
Common Symptoms of a Failing Switch on a Ford Flex
If you have a bad oil pressure switch, you will likely see one or more of these signs:
- Flickering or Solid Oil Light: The red oil pressure light on your dashboard may turn on and off randomly, or it might stay on constantly, even when you know the oil level is correct. 🎬 See how a flickering oil light looks when the sensor fails.
- Oil Leaking From the Switch: A very common issue on the Ford Flex is for the switch itself to fail and leak oil. Oil can seep through the body of the sensor and drip out of the electrical connector. If you see oil on the switch or the wiring harness connected to it, you've found your problem.
- Check Engine Light: A faulty switch can trigger the check engine light. A common trouble code associated with this is P0520, which points to a problem in the oil pressure sensor circuit.
Choosing the Right Aftermarket Part
For a simple but important sensor like this, quality matters. You don't want to replace it again in a year. Here's a look at the brands available.
- Standard Ignition (SMP): This is a well-known and respected aftermarket brand that has been around for a long time. They manufacture their own parts and have a reputation for quality and reliability, making them a safe bet for an aftermarket replacement.
- True Tech: This brand appears to be a budget-friendly or private-label option. While it offers a lower price point, there is less public information available about its manufacturing and long-term reliability compared to established brands like Standard Ignition. It can be a good choice if budget is the primary concern.
Pro Tip: Many mechanics recommend using original equipment (OEM) Motorcraft sensors for Ford vehicles to guarantee a perfect fit and function. However, a quality aftermarket brand like Standard Ignition is a very reliable alternative that can save you money.
Ford Flex Oil Pressure Switch Cost
The cost to replace the switch depends on whether you do it yourself or take it to a shop. The part itself is not expensive.
| Part or Service | Estimated Cost |
|---|---|
| New Aftermarket Switch | $20 - $32 |
| New OEM (Motorcraft) Switch | $25 - $45 |
| Shop Labor | $61 - $90 |
| Total Professional Replacement | $81 - $135 |
Frequently Asked Questions
Is there a recall for the oil pressure switch on my Ford Flex?
No. While Ford has issued recalls for oil pressure problems on other models, there are no active recalls for the engine oil pressure switch on the 2009-2019 Ford Flex. The widely publicized recall 23S64 is for 1.0L engines not used in the Flex.
Can I replace the oil pressure switch myself?
Yes, for most owners this is a manageable DIY job, especially on the non-turbo 3.5L engine. The switch is located on the front of the engine near the oil filter and can be reached from under the car. 🎬 Watch this 6-minute walkthrough to replace your leaking sensor. It requires a 13/16" or 21mm deep socket. On the 3.5L EcoBoost (twin-turbo) engine, the switch is in a much harder-to-reach spot behind the alternator, making the job more difficult.
🎬 Watch this guide for fixing the oil light on EcoBoost engines.What does the code P0520 mean?
P0520 is a generic Diagnostic Trouble Code (DTC) for "Engine Oil Pressure Sensor/Switch Circuit Malfunction." It means the engine's computer has detected a problem with the signal from the sensor. This could be because the sensor has failed, there's a wiring issue, or there's a real oil pressure problem. Often, on the Flex, it points directly to a bad, leaking switch.
My oil light is on, but the dipstick shows it's full. What should I do?
First, do not drive the vehicle. An oil light with a full oil level is the classic symptom of either a failed oil pressure switch or a more serious internal engine problem like a failing oil pump. Because you can't be sure which it is without proper testing, the safest action is to not run the engine. Check the switch for visible oil leaks, as this is a common point of failure.
Helpful Videos
Technical Specifications
OEM Part Numbers: SW-8368 GC3Z-9278-B
Fits 3.5L V6 engines. Requires a 13/16" or 21mm deep well socket for installation. Thread sealant is recommended.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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