爱车疑问：警告灯亮了 又自己灭了 是怎么回事？

有件小事：我的一辆2006 马自达6i，警告灯亮半年多了，故障码是P2402（EVAP system leak)，行驶无异常，消除掉马上又亮。网上有说是O2 传感器需要更换，就买了Denso 牌备换。一直犯懒没换。还有说是换EVAP system leak detection pump。现在警告灯自己灭了 不亮了，有点疑惑：自适应了？还是另有所谋？谢网友答疑！

 

网上找到的，看来靠谱

… the CEL comes on posting code P2402 as usual. Other suggestions from the Auto Zone printout include electrical conductivity, bad sensor or bad pump. 
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In the case of '2402' EVAP system leak detection pump motor circuit high. 
There are 3 suspect parts, electrical shorts (corroded terminals causing high current to ground),
Bad airpump motor assy.
Defective PCM.