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P0030 P0xxx · パワートレーン (P) 重大度中
HO2S Heater Control Circuit (Bank 1 Sensor 1)
The upstream oxygen sensor's internal heater is not drawing the expected current. The sensor then warms slowly, so fuel control stays open-loop longer and emissions and consumption rise.
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
- Higher fuel consumption
- Rich or lean fuel trims
- Failed emissions test
- Rotten-egg smell
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 Burnt-out heater element inside the sensor (most common)
- 2 Blown heater fuse or open wiring
- 3 Corroded connector near the exhaust
- 4 Aftermarket sensor with wrong resistance
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 the heater fuse first — a lot of these are a 15 A fuse.
- ✓ Measure heater resistance across the two same-coloured wires at the sensor connector.
- ✓ Confirm battery voltage reaches the harness side with the key on.
- ✓ Watch O2 sensor warm-up time in live data; a dead heater never reaches closed loop quickly.
修理の選択肢
- Replace the oxygen sensor
- Repair wiring or connector
- Replace the heater fuse and find why it blew
P0030 — よくあるご質問
Can I just replace the fuse? +
If it blows again the heater or wiring is shorted. Find the cause before throwing fuses at it.
Does it affect the catalytic converter? +
Yes — prolonged rich running overheats and eventually destroys the catalyst.