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Standard Ignition PS-391 Engine Oil Pressure SwitchOE Quality 60-Day Returns
Part #: PS-391

Standard Ignition PS-391 Engine Oil Pressure Switch

3 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Ford, Lincoln, and Mercury, Fusion, MKZ, and Milan
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Engine Oil Pressure Switch for Ford, Lincoln, and Mercury

Standard Ignition PS-391 is an engine oil pressure switch built for vehicles that use an oil pressure gauge. It is a direct-fit service part for 2010 Ford Fusion, 2010 Lincoln MKZ, and 2010 Mercury Milan applications with gauge-equipped engines.

Key Features

  • Female connector with a male terminal interface
  • Single-terminal design with screw terminal type
  • Laser-etched calibration for accurate oil pressure reading
  • Polyimide film diaphragm construction for cycle durability
  • Built to resist rupture and oil leakage under demanding engine conditions
  • Tested with automated equipment for activation, leak checking, and specification verification

Detailed Description

Standard Ignition PS-391 is engineered for oil pressure monitoring in engines equipped with an oil pressure gauge. The switch uses a calibrated thick-film circuit process to help deliver accurate pressure feedback, while the high-temperature diaphragm material supports durability in hot engine environments. This part number is a practical replacement choice for 2010 Ford Fusion, 2010 Lincoln MKZ, and 2010 Mercury Milan models when the original oil pressure switch needs service.

This part cross-references 0940202 and OP6741 for the same application.

What It Helps Address

  • Inaccurate oil pressure gauge readings
  • Oil pressure warning light concerns tied to switch failure
  • Oil seepage or leakage at the switch body
  • Intermittent gauge response from a worn pressure switch
  • Electrical connection issues at the oil pressure sender circuit

Installation Notes and Tips

Verify engine configuration before ordering, since this part is for engines that have an oil pressure gauge. Confirm the connector style, terminal type, and thread engagement match the original unit. Inspect the harness connector and surrounding oil passage area for contamination or damage before installation. Standard Ignition PS-391 should be installed on the correct engine application for 2010 Ford Fusion, Lincoln MKZ, or Mercury Milan service.

Quality Assurance

Standard Ignition uses automated testing to check switch activation, leak integrity, and specification compliance. The robust construction and high-grade materials are intended to meet the demands of professional engine service.

BrandStandard Ignition
Part NumberPS-391
Connector GenderFemale
Terminal GenderMale
Terminal TypeScrew

This part fits 3 vehicles. Search below:

YearMakeModelPositionNotes
2010FordFusionN/ACompatible with engines that have oil pressure gauges.
2010LincolnMKZN/ACompatible with engines that have oil pressure gauges.
2010MercuryMilanN/ACompatible with engines that have oil pressure gauges.

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

0940202OP6741S4163

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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