P0325 on a Volvo: Causes, Fixes & Repair Cost
🟠 Moderate severity · drivable
You can drive, but the engine runs with reduced timing protection and fuel economy may drop, so have the knock sensor checked soon.
What P0325 means on a Volvo
On a Volvo, P0325 means the knock sensor on bank 1 is not sending a proper signal to the engine computer. The sensor detects engine knock so the computer can adjust ignition timing; a bad sensor circuit leaves the engine without that protection.
Is P0325 common on Volvos?
P0325 appears on Volvos with higher mileage, especially S60, XC60, XC90, and V70 models. Knock sensor failure and damaged wiring near the sensor are the common causes, and access to the sensor varies by engine.
Commonly reported on: S60, XC60, XC90, V70.
Symptoms
- Check engine light on
- Reduced fuel economy
- Engine pinging under load
- Slight loss of power
Common causes
- most common: Failed knock sensor
- common: Chafed or damaged sensor wiring harness
- common: Corroded or loose sensor connector
- rare: Engine computer issue
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the knock sensor | Mechanic | $250–600 |
| Repair the wiring harness near the sensor | Mechanic | $100–350 |
| Clean and reseat the sensor connector | Yes | $20–80 |
Frequently asked questions
Other common Volvo codes
P0325 on other brands
Looking for the full (non-brand-specific) guide? See the P0325 code page →
Browse all Volvo codes: Volvo hub →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.