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P0325 P0xxx · 动力总成（P） 中严重度
Knock Sensor 1 Circuit Malfunction (Bank 1)
The knock sensor signal is missing or out of range, so the ECU cannot detect detonation and will typically retard ignition timing as a protective default.
严重程度说明： 中——已影响行驶或排放，请本周内安排检修
你会注意到的故障现象
- Reduced power
- Poor fuel economy
- Pinging under load
- No audible knock detection
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed knock sensor
- 2 Damaged wiring (often rodent damage)
- 3 Loose mounting bolt changing the sensor's torque
- 4 Corrosion under the sensor
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Inspect the sensor harness — knock wiring is a favourite target for rodents.
- ✓ Check the mounting bolt torque; over- or under-torque changes the signal.
- ✓ Tap-test the sensor while watching the signal on a scope or live data.
- ✓ Measure resistance and check for a short to earth.
维修方案
- Replace the knock sensor and torque to specification
- Repair the harness
- Clean the mounting surface
P0325 —— 常见问题
Is it safe to drive? +
Generally yes, but the engine runs with retarded timing — you lose power and economy until it is fixed.
Why must the bolt torque be exact? +
The sensor is a piezoelectric microphone; wrong torque changes its resonant frequency and the ECU misreads knock.