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P0016 P0xxx · パワートレーン (P) 重大度高
Crankshaft / Camshaft Position Correlation (Bank 1 Sensor A)
The relative position between crank and cam is outside the learned window. This is a mechanical timing problem until proven otherwise — stretched chain, jumped tooth, or a badly worn tensioner.
重大度の目安： 高 — 走行を止めてすぐに診断してください。さらに損傷が広がる恐れがあります
確認できる症状
- Hard start or no start
- Severe misfire
- Rattle from the front of the engine
- Possible piston-to-valve contact on interference engines
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 Stretched or jumped timing chain / belt
- 2 Failed chain tensioner or guide
- 3 Wrongly installed timing components after a repair
- 4 Damaged reluctor wheel or sensor wiring (less common)
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。
- ✓ Check whether the engine still starts and runs smoothly — if it rattles, stop and inspect before further cranking.
- ✓ Read cam/crank correlation PIDs and compare against specification.
- ✓ Remove the front cover / inspection plug and verify timing marks physically.
- ✓ Scope crank and cam signals together to confirm the mechanical offset.
修理の選択肢
- Timing chain / belt and tensioner replacement with the correct locking tools
- Re-time the engine to factory marks
- Compression and leak-down test if valve contact is suspected
P0016 — よくあるご質問
Is it safe to drive? +
No. On an interference engine a jumped tooth can destroy valves. Have it inspected before further driving.
Can a sensor cause it? +
Rarely. About 90% of P0016 cases are mechanical timing, not sensors.