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P0325 P0xxx · パワートレーン (P) 重大度中
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.
重大度の目安： 中 — 走行性または排出ガスに影響。今週中に点検を予約してください
確認できる症状
- Reduced power
- Poor fuel economy
- Pinging under load
- No audible knock detection
主な原因
可能性の高い順に並んでいます。上から順に確認してください。
- 1 Failed knock sensor
- 2 Damaged wiring (often rodent damage)
- 3 Loose mounting bolt changing the sensor's torque
- 4 Corrosion under the sensor
点検・修理の手順
費用が安く侵襲の小さい項目から — これらのコードの大半は部品の問題ではありません。
- ✓ 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.
修理の選択肢
- Replace the knock sensor and torque to specification
- Repair the harness
- Clean the mounting surface
P0325 — よくあるご質問
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.