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.

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.

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.

For 2006 and earlier four-cylinder models, start by disconnecting the cable from the negative battery terminal, then raise the front of the vehicle and secure it on jackstands. Locate the knock sensor on the back side of the block near the alternator; for the 2.3L model, remove the intake manifold first. Detach the knock sensor electrical connector from its bracket and disconnect it, followed by removing the retaining nut and the sensor itself. Installation is the reverse of removal, ensuring the retaining nut is tightened to the specified torque. After reconnecting the battery, the Powertrain Control Module (PCM) must relearn its idle and fuel trim strategy for optimal performance. For 2008 and earlier V6 models, the process begins similarly with the negative battery terminal disconnection and vehicle elevation. The knock sensor is located on the rear side of the block near the transaxle; trace the electrical lead to the connector, disconnect it, and then remove the retaining bolt and sensor. Again, installation is the reverse, with attention to torque specifications. After reconnecting the battery, the PCM must relearn its idle and fuel trim strategy. For 2007 and later four-cylinder models, disconnect the negative battery terminal, remove the intake manifold, disconnect the wiring harness from the sensor, and then remove the mounting bolt and sensor, with installation being the reverse. For 2009 and later V6 models, note that there are two knock sensors; one is on the left end of the rear cylinder head and the other is under the lower intake manifold. Disconnect the negative battery terminal, remove the lower intake manifold if working on the engine block-mounted sensor, disconnect the wiring harness, and remove the mounting bolt and sensor, with installation following the reverse order.

For 2006 and earlier four-cylinder models, start by disconnecting the cable from the negative battery terminal, then raise the front of the vehicle and secure it on jackstands. Locate the knock sensor on the back side of the block near the alternator; for the 2.3L model, remove the intake manifold first. Detach the knock sensor electrical connector from its bracket and disconnect it, followed by removing the retaining nut and the sensor itself. Installation is the reverse of removal, ensuring the retaining nut is tightened to the specified torque. After reconnecting the battery, the Powertrain Control Module (PCM) must relearn its idle and fuel trim strategy for optimal performance. For 2008 and earlier V6 models, the process begins similarly with the negative battery terminal disconnection and vehicle elevation. The knock sensor is located on the rear side of the block near the transaxle; trace the electrical lead to the connector, disconnect it, and then remove the retaining bolt and sensor. Again, installation is the reverse, with attention to torque specifications. After reconnecting the battery, the PCM must relearn its idle and fuel trim strategy. For 2007 and later four-cylinder models, disconnect the negative battery terminal, remove the intake manifold, disconnect the wiring harness from the sensor, and then remove the mounting bolt and sensor, with installation being the reverse. For 2009 and later V6 models, note that there are two knock sensors; one is on the left end of the rear cylinder head and the other is under the lower intake manifold. Disconnect the negative battery terminal, remove the lower intake manifold if working on the engine block-mounted sensor, disconnect the wiring harness, and remove the mounting bolt and sensor, with installation following the reverse order.

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.

Loosen the knock sensor heat shield and position it aside.

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).