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. If the signal is too high, too low, or erratic, the ECM sets this code. This can be caused by a faulty knock sensor, wiring issues, or engine mechanical problems that create abnormal vibrations.
1. Most Common Causes
- Faulty knock sensor or internal degradation
- Poor connection or loose terminal at the sensor connector
- Short circuit or open circuit in the sensor wiring
- Mechanical engine issue causing abnormal vibrations that confuse the sensor
- Excessive carbon deposits on the engine block or cylinder head
- Failed engine control module (ECM)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Poor fuel economy
- Engine knocking or pinging noise
- Possible hesitation or misfire
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the knock sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the knock sensor resistance and voltage output using a multimeter (specs vary by vehicle).
Step 4: Check sensor mounting torque (typically 15-20 ft-lbs) and ensure proper contact with engine block.
Step 5: If wiring and sensor check out, perform a live data scan to monitor knock sensor signal while revving engine.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as engine knocking can cause severe internal damage. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The knock sensor itself costs $30-$100, and labor is 1-2 hours.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.