P0329 Code: Knock Sensor 1 Circuit Intermittent (Bank 1)
🟠 Moderate severity · drivable
Drivable, but an intermittent knock signal means the engine may ping, so fix it soon.
What P0329 means
Knock sensor 1 on bank 1 is dropping its signal in and out. This sensor detects engine knocking, and the computer uses it to adjust ignition timing and protect the engine. An intermittent signal usually points to a loose wire, a bad connector, or a failing sensor.
Symptoms
- Check engine light is on
- Engine pinging under load
- Reduced power
- Poor fuel economy
Common causes
- most common: Loose or damaged wiring at the connector
- common: Faulty knock sensor
- common: Corroded connector
- less common: Excessive engine mechanical noise
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and clean the sensor connector and wiring | Yes | $0–10 |
| Replace the knock sensor | Yes | $50–200 |
| Repair damaged sensor wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P0329 code?
Yes, but the engine may ping, and the computer can't fully protect it. Fix it soon.
What is the most common cause of P0329?
Loose or damaged wiring at the knock sensor connector.
How much does it cost to fix a P0329?
Often just a connector cleanup; a new sensor runs about $50–$200.
Related codes
P0325
P0325 Code: Knock Sensor 1 Circuit Malfunction (Bank 1)
P0326P0326 Code: Knock Sensor 1 Circuit Range/Performance (Bank 1)
P0328P0328 Code: Knock Sensor 1 Circuit High Input (Bank 1)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.