Hi, A car knock sensor is located on the intake manifold, cylinder, or engine block. The purpose of the knock sensor is to sense unusual pulsations caused by the engine detonation. It is basically the computer's ear to the engine to determine if it is working properly.

Under car near catalytic converter.

Hi Harry, thanks for initiating contact. The P0325 code is a diagnostic trouble code that indicates a malfunction in the knock sensor circuit. The knock sensor is responsible for detecting engine knocking or pinging, and relaying that information to the engine control unit (ECU). Troubleshooting steps often involve testing the knock sensor, inspecting the wiring, and checking for any voltage issues in the circuit. Replacing the knock sensor on your 2004 Honda CR-V is a common repair for this code. Use the link below to order while the part is in stock. Your order will come with a 30-day post-purchase price match guarantee. Enjoy shopping! https://www.carparts.com/knock-sensor/replacement/reph311202?can=CPGG4850_CSQA_20240614

Hi Jose, I'm glad to assist you. No, this is an aftermarket part. We have an equivalent brand to the Honda OEM sensor available at this link: https://www.carparts.com/knock-sensor/vemo/z8yv26720167?can=CPAE1047_CSQA_20230523 I hope this helps, and we hope you can enjoy our limited stocks. Happy shopping.