Knock Sensor 1 Circuit Range/Performance (Bank 1)
The P0326 code indicates that the Engine Control Module (ECM) has detected a signal from the knock sensor that is outside the expected range or performance parameters. The knock sensor detects engine knocking or pinging and sends a voltage signal to the ECM. When the signal is erratic, too high, or too low, the ECM sets this code. This can be caused by a faulty knock sensor, wiring issues, or engine mechanical problems that generate abnormal vibrations.
01. Most Common Causes
- Faulty knock sensor
- Damaged or corroded wiring/connector to knock sensor
- Engine mechanical issues (e.g., worn bearings, piston slap) causing false knock
- Incorrect sensor torque or mounting
- ECM software or hardware failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance and fuel economy
- Engine knocking or pinging noise under load
- Possible hesitation or lack of power
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the knock sensor wiring and connector for damage, corrosion, or loose connection.
Step 3: Check the knock sensor mounting torque (typically 20 Nm) and ensure proper contact with the engine block.
Step 4: Use a multimeter to test the knock sensor resistance (usually 100k-1M ohms) and compare to specs.
Step 5: Perform a knock sensor signal test using a scan tool or oscilloscope while tapping near the sensor.
Step 6: If sensor and wiring are okay, inspect for engine mechanical issues (e.g., excessive valve noise, worn bearings).
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances. The ECM may retard timing to protect the engine, reducing performance and fuel economy. Continued driving could lead to engine damage if knocking is severe.
How much does it cost to fix?▼
Replacing a knock sensor typically costs $150-$400 including parts and labor. Diagnostic time may add $50-$100.