P0325 Code: Knock Sensor Circuit (Bank 1)
P0325 means a fault in the knock (detonation) sensor circuit on bank 1 — the sensor that lets the ECM retard timing to prevent knock.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $80 – $500
- Time to fix
- 1-3 hours
What it means
Common causes are a failed knock sensor, a wiring/connector fault, or corrosion at the sensor. This is a generic OBD-II powertrain code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer OBD-II vehicle — cars, trucks, and modern fuel-injected motorcycles — from any manufacturer (Toyota, Honda, Ford and the rest). Read it with any OBD-II scanner; the meaning is the same across brands, though the exact repair can vary by engine.
Symptoms
- Check engine light on
- Possible pinging/knock under load
- Reduced power or economy
How to fix it
- 1
Inspect and test the knock sensor
1. Check the knock sensor connector and wiring. 2. Test the sensor; replace if faulty (often under the intake). 3. Clear the code.
Frequently asked questions
Can I drive with P0325?
Short-term yes, but the ECM may pull timing (reducing power) and can’t protect against knock as well. Fix it to avoid long-term engine stress.
Last updated July 16, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.