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Knock Sensor Replacement
 
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Pelican Technical Article:

Knock Sensor Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$50 to $200

Talent:

**

Tools:

8mm Allen socket

Applicable Models:

Porsche 955 Cayenne GTS (2008-10)
Porsche 955 Cayenne S (2008-10)
Porsche 955 Cayenne Turbo (2008-10)
Porsche 955 Cayenne Turbo S (2009-10)
Porsche 970 Panamera 4S (2010-14)
Porsche 970 Panamera GTS (2013-14)
Porsche 970 Panamera S (2010-14)
Porsche 970 Panamera Turbo (2010-14)
Porsche 970 Panamera Turbo Executive (2014)
Porsche 970 Panamera Turbo S (2012-14)
Porsche 970 Panamera Turbo S Executive (2014)

Parts Required:

Knock sensors

Hot Tip:

Torque the bolt correctly

Performance Gain:

Proper running engine

Complementary Modification:

New air filter

There are four knock sensors on the Porsche Cayenne that together play an important part of the engine management system. The sensors detect knock or ping in the motor, which is pre-detonation and can cause serious and expensive damage to the motor. If knock is detected, the sensor will tell the management system of the engine to severely retard the ignition. Besides an error code you will notice a lack of power and throttle response, especially when on boost.

The sensors are easy to replace once you get access to them. Unfortunately, you need to need to remove the intake manifold, fuel rail and starter (for the rear sensors). Please see our articles on how to perform this work. Note: you will need a special torque wrench to properly torque the sensors.

Note: The knock sensors are torque sensitive. Over or under torquing them will result in incorrect readings from the sensors and poor performance from the motor.

You are going to remove the intake manifold to give you room to access the pump.
Figure 1

You are going to remove the intake manifold to give you room to access the pump. Please see our article on intake manifold removal for additional assistance.

You will also need to remove the fuel rail.
Figure 2

You will also need to remove the fuel rail.

If you are replacing the two rear sensors you will need to remove the starter.
Figure 3

If you are replacing the two rear sensors you will need to remove the starter. Please see our article on starter replacement for additional information.

With everything removed you can see the four knock sensors deep in the valley of the V (red arrows).
Figure 4

With everything removed you can see the four knock sensors deep in the valley of the V (red arrows). This is also a good time to clean out the valley of the motor.

Disconnect the sensor you are going to replace (red arrow).
Figure 5

Disconnect the sensor you are going to replace (red arrow).

If you have the right selection of extensions, wobblers, and universal joints you can replace the sensors without removing additional coolant or the vacuum lines (red arrow).
Figure 6

If you have the right selection of extensions, wobblers, and universal joints you can replace the sensors without removing additional coolant or the vacuum lines (red arrow).

Installation is the reverse of removal.
Figure 7

Installation is the reverse of removal. The bolts are considered single use only and important to the function of the sensor. Note: The knock sensors are torque sensitive and over or under torquing them will result in incorrect readings from the sensors and poor performance from the motor.



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