愛車疑問：警告燈亮了 又自己滅了 是怎麽回事？

有件小事：我的一輛2006 馬自達6i，警告燈亮半年多了，故障碼是P2402（EVAP system leak)，行駛無異常，消除掉馬上又亮。網上有說是O2 傳感器需要更換，就買了Denso 牌備換。一直犯懶沒換。還有說是換EVAP system leak detection pump。現在警告燈自己滅了 不亮了，有點疑惑：自適應了？還是另有所謀？謝網友答疑！

 

網上找到的，看來靠譜

… 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.