How to Service the Engine Oil Pressure Switch on 2009 Mercury Mariner?

Start the Engine Oil Pressure (EOP) switch service by hoisting the vehicle to a position while keeping it in the NEUTRAL gear. The service requires removal of the five bolts and the pin-type retainer and the right-hand splash shield. The service requires removal of the EOP switch electrical connector and thereafter removal of the switch always applying thread sealant to the switch threads before replacement. The EOP switch should be tightened to 15 Nm (133 lb-in) before reconnecting the electrical connector. Reinstall the splash shield by securing its five bolts at 9 Nm torque.

OEM 2009 Mercury Mariner Oil Pressure Switch

Oil Pressure Sender Switch

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2 Oil Pressure Switches found

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2009 Mercury Mariner Pressure Switch
Part Number: G1CZ-9278-B
$24.30 MSRP: $38.58
You Save: $14.28 (38%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Switch Assembly - Oil Pressure; Engine Oil Pressure Switch; Oil Pressure Sending Unit; Oil Pressure Switch
- Replaces: 1U5Z-9278-GA, SW-6376, 6U5Z-9278-G, G1CZ-9278-A
- Item Weight: 0.30 Pounds
- Item Dimensions: 3.1 x 1.7 x 1.3 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: G1CZ-9278-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
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Fits the following 2009 Mercury Mariner Submodels:
- Base, Hybrid, Premier | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
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2009 Mercury Mariner Pressure Switch
Part Number: 6U5Z-9278-N
$127.08 MSRP: $209.09
You Save: $82.01 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Switch Assembly - Oil Pressure; Engine Oil Pressure Switch; Oil Pressure Sending Unit; Oil Pressure Switch
- Replaces: SW-6356, 6U5Z-9278-J
- Base No.: 9278
- Item Weight: 0.30 Pounds
- Item Dimensions: 6.2 x 4.2 x 4.1 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 6U5Z-9278-N
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
More Info
Fits the following 2009 Mercury Mariner Submodels:
- Base, Premier | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS

2009 Mercury Mariner Oil Pressure Switch

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2009 Mercury Mariner Oil Pressure Switch Parts Questions & Experts Answers

Q: How to Service the Engine Oil Pressure Switch on 2009 Mercury Mariner?
A: Start the Engine Oil Pressure (EOP) switch service by hoisting the vehicle to a position while keeping it in the NEUTRAL gear. The service requires removal of the five bolts and the pin-type retainer and the right-hand splash shield. The service requires removal of the EOP switch electrical connector and thereafter removal of the switch always applying thread sealant to the switch threads before replacement. The EOP switch should be tightened to 15 Nm (133 lb-in) before reconnecting the electrical connector. Reinstall the splash shield by securing its five bolts at 9 Nm torque.