J Replace OE Replacement Knock Sensor - Nissan 240sx SR20DET KA24DE

A dead knock sensor on a 240SX puts the ECU into a conservative timing map and lights the check engine light, which costs power and makes tuning a guessing game. This J Replace OE replacement knock sensor fits the Nissan S13, S14 and S15 chassis running the SR20DET or KA24DE engine, giving you a new sensor for a part that is often sold used or as an unknown quality generic.

What a Knock Sensor Does

The sensor is a piezoelectric microphone bolted to the block that listens for the frequency of detonation. When it hears knock, the ECU pulls ignition timing to protect the engine. If the sensor fails or its wiring cracks, the ECU can no longer trust it and defaults to safe timing, so the engine runs flat even when the fuel is good.

Fitment

• Nissan S13 240SX, Silvia and 180SX with SR20DET or KA24DE
• Nissan S14 240SX and Silvia with SR20DET or KA24DE
• Nissan S15 Silvia with SR20DET

Symptoms of a Failed Sensor

• Knock sensor fault code stored in the ECU
• Retarded timing and sluggish throttle response
• Reduced boost response on turbocharged engines

Install Tips

The sensor is sensitive to mounting torque, so tighten it to the factory specification rather than cranking it down. Check the sub harness for brittle insulation, since the original knock sensor wiring is a very common failure point on these engines.