PRODUCT DETAILS
Honda OEM Knock Sensor - K20Z3 / F22C Engines
Your Civic Si or S2000 is pinging under load. You're hearing that metallic knock when you accelerate hard or when you're in a lower gear at highway speed. The knock sensor's failing. It's not detecting detonation like it should. The engine control unit's not pulling timing to prevent pinging. You're stuck with a motor that's knocking on itself. This is genuine Honda OEM part 30530-PRC-003. It's the correct knock sensor for K20Z3 and F22C engines. The sensor threads into the engine block and listens for detonation. When it detects pinging it sends a signal to the ECU. The ECU pulls timing back to stop the knock. When the knock sensor fails the ECU doesn't get the signal. The engine keeps detonating. You're hearing pinging. You're risking engine damage from uncontrolled knock. Replace the knock sensor when you're hearing detonation.
Here's Why Knock Sensors Fail
The knock sensor threads into the engine block and sits there listening to the engine. It's picking up vibrations from detonation and sending electrical signals to the ECU. After 15+ years the sensor's worn out. The piezo crystal inside degrades. The electrical connection corrodes. The sensor stops working. It stops detecting knock. When the knock sensor fails you lose the ECU's ability to correct for bad fuel or aggressive driving. You're pinging under load. You're hearing that metallic knock that means the fuel's detonating instead of burning smoothly. Every time the engine knocks it's a small explosion happening uncontrolled inside the cylinder. You're stressing the pistons. You're stressing the rods. You're stressing the head. Uncontrolled knock over time damages the engine. The pistons can crack. The rods can bend. The head can warp. All because the knock sensor failed and the ECU didn't know to pull timing. Replace the knock sensor before the pinging damages the motor.
Knock Sensor Failure Symptoms - You'll Hear It
If your knock sensor's failing you're going to hear it. You're accelerating and you're hearing a metallic pinging sound coming from under the hood. It's loud. It's noticeable. You can't miss it. The pinging gets worse under load. It gets worse in lower gears. It gets worse when the engine's hot. Sometimes you only hear it occasionally when you're pushing hard. Sometimes it's constant whenever you're above 3000 RPM. Either way if you're hearing metallic knock you've got a knock sensor problem or you've got bad fuel. Rule out the fuel first. Try a tank of premium from a different station. If the pinging stops the sensor's fine. If it continues you've got a failing knock sensor. Replace it.
Honda OEM Sensor - The Right Part
This is genuine Honda OEM part 30530-PRC-003. It's the knock sensor Honda installs in K20Z3 and F22C engines at the factory. The piezo crystal's the correct sensitivity for these engines. The threads match the engine block perfectly. The connector matches the wiring harness. It plugs in and works correctly. Aftermarket knock sensors are cheaper. Some are fine. Some are junk. We've seen aftermarket sensors with wrong sensitivity. They detect pinging when there isn't any or they don't detect real knock. We've seen cheap sensors that fail after 10,000 miles because the piezo crystal's garbage. We've seen sensors with connector issues that don't seat properly in the harness and cause intermittent problems. The knock sensor is critical for engine protection. It's not where you buy a generic sensor and hope the sensitivity's close enough. Buy the Honda sensor. It's engineered for your engine. It works correctly. You install it once and the knock detection works right.
What You Get
- Honda OEM knock sensor - part number 30530-PRC-003
- Fits K20Z3 and F22C engines
- Genuine Honda sensor - not aftermarket
- Direct replacement
- One sensor per order
Fits These Cars
- 2006-2011 Honda Civic Si (K20Z3 engine)
- 2006-2009 Honda S2000 (F22C engine)
Note: Knock sensor for K20Z3 and F22C engines. Genuine Honda OEM part 30530-PRC-003. Threads into engine block. Detects detonation and sends signal to ECU. ECU pulls timing when detonation detected to prevent engine knock. Knock sensor failure allows uncontrolled detonation, metallic pinging sound under load, engine stress and potential damage (cracked pistons, bent rods, warped head). Replace when hearing pinging or during engine service. Symptoms of failure: metallic knock sound when accelerating, pinging in lower gears, pinging when engine hot. One sensor per order.