P0328 Subaru Code - Knock Sensor 1 Circuit High Input - Bank 1 Or Single Sensor

P0328 indicates a high input signal from Knock Sensor 1 on Bank 1 or the single sensor in the engine. It typically means the sensor is detecting abnormal engine vibrations or the sensor circuit is faulty.

Common symptoms include illuminated check engine light, reduced engine performance, poor fuel economy, hesitation during acceleration, and possible knocking sounds from the engine.

Potential causes include a faulty knock sensor, damaged sensor wiring, corroded or loose electrical connections, excessive engine vibrations, or an engine control module (ECM) issue.

While it may be possible to drive with this code, it is not recommended. Ignoring the issue can lead to engine damage due to uncontrolled knocking or reduced performance.

Diagnosis typically involves inspecting the knock sensor and wiring for damage, testing the sensor's output with a multimeter, checking for loose connections, and using a scan tool to monitor live data.

Repairs may include replacing the knock sensor, repairing damaged wiring, cleaning corroded connections, or updating/reprogramming the ECM if necessary.

The knock sensor detects engine knocking or pinging caused by improper combustion and sends signals to the ECM to adjust the timing and fuel mixture accordingly.

Repair costs vary but typically range from $150 to $400 for parts and labor, depending on the vehicle model and whether the knock sensor or wiring needs replacement.

Yes, a failing knock sensor can prevent the ECM from properly managing engine timing, which may lead to prolonged knocking and potential engine damage.

Basic tools like a socket set, multimeter, and an OBDII scan tool are typically required to diagnose and repair this code effectively.