Mercury 1S7Z-12A699-BB Sensor - Engine Knock

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A knock sensor is installed on both 2.0L SPI engines and 20LZetec-E engines. On Zetec-E engines, it's bolted to the firewall-side of the cylinder block, just ahead of the starter motor, On SPI engines, it is located on the front side of the block, just below the exhaust manifold,On 2.3L and 2005 and later 2.0L engines, it is located on the block,under the intake manifold. The knock sensor wiring plug is clipped to a bracket next to the engine oil dipstick. Slide the wiring plug downward to remove it from the clip, then separate the two halves of the wiring plug. Trace the wiring down to the knock sensor, then unscrew the center bolt and remove the sensor from the engine. On 2.3L and 2005 and later 2.0L engines, the intake manifold must be removed first. Installation is a reversal of removal, noting the following points: Clean the sensor and its location on the engine. The sensor must be positioned so that it does not contact the cylinder head,or the crankcase ventilation system oil separator housing (where applicable). The sensor bolt must be tightened to the specified torque, as this is critical to the sensor's correct operation.

The knock sensor is positioned in the valley between the cylinder heads on V6 engines and on the left side of the block on 2.3L engines, underneath the intake manifold. Disconnecting the cable from the negative battery terminal is paramount. Disconnecting the knock sensor harness connector, removing the sensor mounting bolt and also removing the sensor are some of these steps for 2.3L engines. Take off intake manifold for V6 engines. For early V6 engines, remove noise shield also. Delicately remove noise shield which is packed inside lower intake manifold's intake runners. Disconnect knock sensor electrical connector also. Some models have their knock sensor connectors placed at the left end of firewall whereas others have theirs located in between a top of a cylinder head or closer to this knock sensor. Remove the retaining bolt for a knock sensor and then take out that knock sensor.

Disconnect the negative battery terminal. Find the knock sensors behind the intake manifold on the front side of the block. Remove the manifold, disconnect the sensor's electrical connector, and remove the bolt and sensor. Install the right-hand sensor with the wire end at 6 o'clock, and the left at 3 o'clock. For V6 models, sensors are between the cylinder heads. They share a wiring harness and must be replaced together. Remove the intake manifold, thermostat housing, coolant tube, disconnect the sensor connector(s), remove the bolt(s) and sensor(s). Reverse the process for installation, and tighten the new ECT sensor.

The knock sensor is found between the cylinder heads on V6 engines, and on the left side of the block on 2.3L engines. Disconnect the negative battery terminal cable. On 2.3L engines, disconnect the sensor harness, remove the mounting bolt and sensor. A new sensor is needed once the old one is removed. On V6 engines, remove the intake manifold and noise shield if necessary. Disconnect the sensor electrical connector, which varies in location depending on the model. Remove the sensor retaining bolt and sensor. Installation is the reverse of removal, ensuring the bolt is tightened securely.

The knock sensors on four-cylinder models are located on the front side of the block, behind the intake manifold. The 1.5L, 1.6L, and 2.0L engines have two knock sensors.

To remove the knock sensors on V6 models, you need to remove the upper and lower intake manifold, as well as the thermostat housing and coolant tube. Then, disconnect the knock sensor electrical connector(s) and remove the knock sensor bolt(s) and knock sensor(s).