P0325

Q: What does OBD2 code P0325 mean?

P0325 means: Knock Sensor 1 Circuit Bank 1. Fault in the knock sensor circuit on bank 1. The knock sensor detects engine detonation (pinging) and signals the ECU to retard ignition timing to prevent engine damage.

Knock Sensor 1 Circuit Bank 1

Fault in the knock sensor circuit on bank 1. The knock sensor detects engine detonation (pinging) and signals the ECU to retard ignition timing to prevent engine damage.

SeverityModerate

CategoryEngine

Est. Repair Cost$100–$350

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Failed knock sensor
›Damaged wiring or connector
›Loose knock sensor mounting bolt
›Excessive engine noise interfering with sensor
›ECU fault

⚠️ Symptoms

›Check engine light
›Possible engine ping or knock under load
›Reduced performance (timing retarded by ECU as precaution)
›Poor fuel economy

✅ How to Fix — Step by Step

Step 1:Check knock sensor torque — must be tightened to specification (15–20 Nm)
Step 2:Inspect wiring and connector for damage
Step 3:Test knock sensor resistance (typically 100k–400k ohms)
Step 4:Replace knock sensor
Step 5:Check for actual engine knock indicating mechanical issues

💡 Pro Tip: The knock sensor must be torqued to exact specification — too loose or too tight both cause false signals and this code.

Repair Cost Estimate

Full Repair Estimate

$100–$350

DIY Possible?

YES

Severity

Moderate

Frequently Asked Questions

What does OBD2 code P0325 mean?+

P0325 stands for Knock Sensor 1 Circuit Bank 1. Fault in the knock sensor circuit on bank 1. The knock sensor detects engine detonation (pinging) and signals the ECU to retard ignition timing to prevent engine damage.

What causes code P0325?+

Failed knock sensor; Damaged wiring or connector; Loose knock sensor mounting bolt; Excessive engine noise interfering with sensor; ECU fault

How do I fix code P0325?+

Check knock sensor torque — must be tightened to specification (15–20 Nm); Inspect wiring and connector for damage; Test knock sensor resistance (typically 100k–400k ohms); Replace knock sensor; Check for actual engine knock indicating mechanical issues

How much does it cost to fix P0325?+

Estimated repair cost for P0325 is $100–$350.

Is P0325 DIY-friendly?+

Yes — P0325 is generally DIY-friendly with basic tools.