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P0101 P0xxx · 动力总成（P） 中严重度
Mass Air Flow Circuit Range / Performance
The MAF reading does not match what the ECU expects for the given RPM, throttle and load. Either the sensor is dirty/out of range, or air is entering the engine without being measured.
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
- Hesitation on acceleration
- Lean or rich fuel trims
- Poor idle
- Black smoke on some diesels
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Contaminated MAF hot-wire or hot-film element
- 2 Air leak after the MAF (split intake boot, loose clamp, cracked PCV hose)
- 3 Clogged air filter
- 4 Wrong or non-original 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。
- ✓ Read MAF grams/second at warm idle and compare with the specification (roughly 1 g/s per litre of displacement).
- ✓ Inspect the whole intake tract from the airbox to the throttle body for loose clamps and cracks.
- ✓ Clean the element with dedicated MAF cleaner only — nothing else.
- ✓ Smoke-test the intake if the leak is not visible; a smoke machine finds it in minutes.
维修方案
- Clean or replace the MAF sensor
- Repair the intake leak
- Replace the air filter
P0101 —— 常见问题
Can I clean the MAF with brake cleaner? +
No. Use only MAF-specific cleaner; other solvents damage the sensing element.
Why is the fuel trim positive at idle but normal at speed? +
Classic vacuum leak signature — unmetered air matters most when airflow is small.