How to Service the Oil Pressure Switch on Mercury Mountaineer?

The maintenance of the oil pressure switch requires removing the battery ground cable as a first step. Begin the oil pressure switch service by first removing the switch after disconnecting its electrical connector. The threads of the new oil pressure switch must receive a coating of Pipe Sealant with Teflon D8AZ-19554-A or Wsk-M2G350-A2 prior to installation. The installation ends by performing the procedure in reverse order.

OEM Mercury Mountaineer Oil Pressure Switch

Oil Pressure Sender Switch

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3 Oil Pressure Switches found

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Mercury Mountaineer Oil Pressure Sending Unit
Part Number: D4AZ-9278-A
$45.08 MSRP: $72.73
You Save: $27.65 (39%)
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Product Specifications
- Other Name: Switch Assembly - Oil Pressure; Engine Oil Pressure Switch; Oil Pressure Gauge Sw; Oil Pressure Switch; Oil Gauge; Oil Gauge Sending Unit
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1997-1998 Mercury Mountaineer | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS
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Mercury Mountaineer Oil Pressure Sensor
Part Number: GC3Z-9278-B
$20.37 MSRP: $31.53
You Save: $11.16 (36%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Switch Assembly - Oil Pressure; Engine Oil Pressure Switch; Oil Pressure Gauge Sw; Pressure Switch; Oil Pressure Switch; Pressure Sensor; Sending Unit; Switch Assembly; Oil Gauge
- Replaces: 6U5Z-9278-D, 1U5Z-9278-DA, GC3Z-9278-A, SW-6357
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1999-2010 Mercury Mountaineer | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS, 8 Cyl 5.0 L GAS
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Mercury Mountaineer Oil Pressure Switch
Part Number: E9SZ-9278-A
$12.22 MSRP: $18.91
You Save: $6.69 (36%)
Product Specifications
- Other Name: Switch Assembly - Oil Pressure; Engine Oil Pressure Switch; Oil Pressure Gauge Sw; Oil Pressure Sending Unit; Oil Gauge Sending Unit
- Replaces: F4TZ-9278-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1997-1998 Mercury Mountaineer | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS

Mercury Mountaineer Oil Pressure Switch

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Mercury Mountaineer Oil Pressure Switch Parts Questions & Experts Answers

Oil Pressure Sensor
GC3Z-9278-B
Q: How to Service the Oil Pressure Switch on Mercury Mountaineer?
A: The maintenance of the oil pressure switch requires removing the battery ground cable as a first step. Begin the oil pressure switch service by first removing the switch after disconnecting its electrical connector. The threads of the new oil pressure switch must receive a coating of Pipe Sealant with Teflon D8AZ-19554-A or Wsk-M2G350-A2 prior to installation. The installation ends by performing the procedure in reverse order.