How to Properly Maintain and Replace the Knock Sensor in a Mercury Mariner?

To service the knock sensor (KS), place the vehicle in neutral on a hoist. Remove the intake manifold and the bolt holding the knock sensor. When installing the new sensor, tighten it to 20 Nm (15 lb-ft) and follow the reverse steps to finish the installation.

How to service the knock sensor on Mercury Mountaineer?

Removal of the lower intake manifold is the first step to service knock sensor. Next, unscrew the bolt and remove the sensor which is the knock sensor. The installation of the new sensor is easy, one just needs to undo this to ensure that it is well installed.

OEM Mercury Knock Sensor

Engine Knock Sensor

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19 Knock Sensors found

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Mercury Knock Sensor Part Number: XL3Z-12A699-AA
$36.36 MSRP: $56.75
You Save: $20.39 (36%)
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Grand Marquis | 2003-2011 | GS, GSL, Limited Edition, LS, LSE, Ultimate Edition | 8 Cyl 4.6 L FLEX, 8 Cyl 4.6 L GAS
- Marauder | 2003-2004 | Base | 8 Cyl 4.6 L GAS
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Mercury Knock Sensor Part Number: 2R3Z-12A699-AA
$28.65 MSRP: $44.33
You Save: $15.68 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Monterey | 2004-2007 | Base, Convenience, Luxury, Premier | 6 Cyl 4.2 L GAS
- Sable | 2002-2005 | GS, LS, LS Premium, Platinum Edition | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mercury Knock Sensor Part Number: 1S7Z-12A699-BB
$44.85 MSRP: $70.00
You Save: $25.15 (36%)
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor; Sensor
- Replaces: 1S7Z-12A699-BA
Fits the following Mercury Models:
- Mariner | 2006-2011 | Base, Hybrid, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
- Milan | 2006-2011 | Base, Hybrid, Premier | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
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Mercury Knock Sensor Part Number: 4L3Z-12A699-AA
$55.59 MSRP: $88.27
You Save: $32.68 (38%)
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Mariner | 2009-2011 | Base, Premier | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
- Milan | 2010 | Premier | 6 Cyl 3.0 L FLEX
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Mercury Knock Sensor Part Number: 1L2Z-12A699-AA
$105.23 MSRP: $167.09
You Save: $61.86 (38%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
- Manufacturer Note: Dual headed Bolt on type sensor
Fits the following Mercury Models:
- Mountaineer | 2002-2005 | Base, Convenience, Luxury, Premier | 8 Cyl 4.6 L GAS
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Mercury Knock Sensor Part Number: 7T4Z-12A699-A
$68.21 MSRP: $108.31
You Save: $40.10 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
- Replaces: 7T4Z-12A699-AB
Fits the following Mercury Models:
- Sable | 2008-2009 | Base, Premier | 6 Cyl 3.5 L GAS
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Mercury Knock Sensor Part Number: XF5Z-12A699-AA
$158.59 MSRP: $215.81
You Save: $57.22 (27%)
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Villager | 1999-2002 | Base, Estate, Sport | 6 Cyl 3.3 L GAS
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Mercury Knock Sensor Part Number: XL3Z-12A699-BA
$43.14 MSRP: $67.33
You Save: $24.19 (36%)
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Mountaineer | 2001-2010 | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS
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Mercury Knock Sensor Part Number: AU5Z-12A699-A
$9.14 MSRP: $14.14
You Save: $5.00 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Milan | 2011 | Premier | 6 Cyl 3.0 L FLEX
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Mercury Knock Sensor Part Number: XS8Z-12A699-AA
Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Cougar | 1999-2000 | V6 | 6 Cyl 2.5 L GAS
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Mercury Knock Sensor Part Number: F77Z-12A699-BA
Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Mountaineer | 1998 | Base | 6 Cyl 4.0 L GAS
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Mercury Knock Sensor Part Number: YL8Z-12A699-AA
Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Mariner | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury Knock Sensor Part Number: YF1Z-12A699-AA
Product Specifications
- Other Name: Sensor - Engine Knock
Fits the following Mercury Models:
- Sable | 2000-2002 | LS, LS Premium | 6 Cyl 3.0 L GAS
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Mercury Knock Sensor Part Number: F6RZ-12A699-DA
Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Cougar | 1999-2002 | Base | 4 Cyl 2.0 L GAS
- Mystique | 1996-1999 | GS, LS | 4 Cyl 2.0 L GAS
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Mercury Knock Sensor Part Number: F6RZ12A699AA
Product Specifications
- Other Name: Sensor - Engine Knock
Fits the following Mercury Models:
- Cougar | 1999 | V6 | 6 Cyl 2.5 L GAS
- Mystique | 1995-1999 | Base, GS, GS Spree, LS, LS Young America | 6 Cyl 2.5 L GAS
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Mercury Knock Sensor Part Number: F3XY-12A699-A
Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Villager | 1993-1998 | GS, LS, Nautica | 6 Cyl 3.0 L GAS
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Mercury Knock Sensor Part Number: 3M8Z-12A699-AA
Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Milan | 2006-2009 | Base, Premier | 6 Cyl 3.0 L GAS
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Mercury Knock Sensor Part Number: 1S8Z-12A699-AA
Product Specifications
- Other Name: Sensor - Engine Knock
Fits the following Mercury Models:
- Cougar | 2001-2002 | Base, S, V6 | 6 Cyl 2.5 L GAS
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Mercury Knock Sensor Part Number: XS2Z-12A699-BA
Product Specifications
- Other Name: Sensor - Engine Knock; Ignition Knock (Detonation) Sensor
Fits the following Mercury Models:
- Mariner | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
- Mystique | 1999-2000 | GS | 4 Cyl 2.0 L GAS

Mercury Knock Sensor Parts and Q&A

Knock Sensor
1S7Z-12A699-BB
Q: How to Properly Maintain and Replace the Knock Sensor in a Mercury Mariner?
A: To service the knock sensor (KS), place the vehicle in neutral on a hoist. Remove the intake manifold and the bolt holding the knock sensor. When installing the new sensor, tighten it to 20 Nm (15 lb-ft) and follow the reverse steps to finish the installation.
Knock Sensor
XL3Z-12A699-BA
Q: How to service the knock sensor on Mercury Mountaineer?
A: Removal of the lower intake manifold is the first step to service knock sensor. Next, unscrew the bolt and remove the sensor which is the knock sensor. The installation of the new sensor is easy, one just needs to undo this to ensure that it is well installed.