P0326 Code: Knock Sensor 1 Circuit Range/Performance (Bank 1)
🟠 Moderate severity · drivable
Drivable, but the computer can't detect knock and may reduce power, so fix it soon.
What P0326 means
Knock sensor 1, on bank 1 of the engine, is sending a signal that's out of the expected range. The knock sensor listens for engine knocking, and the computer uses it to back off the ignition timing and protect the engine. Without a good signal, the computer can't guard against detonation.
Symptoms
- Check engine light is on
- Reduced power
- Engine pinging under load
- Poor fuel economy
Common causes
- most common: Faulty knock sensor
- common: Damaged wiring or loose connector
- common: Knock sensor not torqued to spec
- less common: Excessive engine mechanical noise
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the knock sensor | Yes | $50–200 |
| Repair damaged sensor wiring | Mechanic | $50–150 |
| Reinstall the sensor with the correct torque | Yes | $0–20 |
Frequently asked questions
Can I drive with a P0326 code?
Yes, but you may notice reduced power or pinging. Fix it soon.
What is the most common cause of P0326?
A faulty knock sensor on bank 1.
How much does it cost to fix a P0326?
Typically $50–$200 for a new knock sensor.
Related codes
P0325
P0325 Code: Knock Sensor 1 Circuit Malfunction (Bank 1)
P0327P0327 Code: Knock Sensor 1 Circuit Low Input (Bank 1)
P0328P0328 Code: Knock Sensor 1 Circuit High Input (Bank 1)
Related guide: The 10 Most Common Check Engine Codes →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.