Standard Ignition PS-391 Engine Oil Pressure Switch
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Standard Ignition

Standard Ignition PS-391 Engine Oil Pressure Switch

Brand Standard Ignition PS-391
Connector Gender Female
Terminal Gender Male
Terminal Type Screw
Fits Ford, Lincoln, and Mercury · 3 vehicles

High-accuracy sensing. Laser-calibrated circuitry delivers precise oil pressure readings.

Durable diaphragm design. Polyimide film resists rupture and oil leakage under stress.

Fully tested. Automated checks verify activation, leaks, and specification compliance.

Cross-references 0940202, OP6741 and S4163 for the same application. See all 3.

$24.82Free shipping
In stock · usually ships same day before 1pm CST
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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.

Related reading

This part fits 3 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
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.
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
0940202OP6741S4163