Typically you’ll have one knock sensor on each bank of the engine (one on inline 4/5/6 cylinder engines, two on V6, V8, V10 engines).Click to see full answer. Besides, can I drive with bad knock sensor?A bad knock sensor may also not let the engine accelerate properly while driving on the highway, and cause the vehicle to lose fuel mileage. If the computer doesn’t recognize a sound, it will illuminate the Check Engine Light. This is true for the knock sensor as well.Also, what are knock sensors? Knock Sensor. The knock sensor is located on the engine block, cylinder head or intake manifold. This is because its function is to sense vibrations caused by engine knock or detonation. The PCM uses this signal to alter the ignition timing and prevent detonation. This sensor takes advantage of this unique property. Keeping this in consideration, what are the signs of a bad knock sensor? Top 5 Bad Knock Sensor Symptoms 1) Engine Warning Light. One of the first symptoms you might notice is the engine warning light illuminating on your dashboard. 2) Loud Sounds. 3) Bad Fuel Mileage. 4) Poor Acceleration. 5) Poor Engine Performance. How much does it cost to replace a knock sensor?The average cost for a knock sensor replacement is between $282 and $363. Labor costs are estimated between $158 and $200 while parts are priced between $124 and $163.