你要麽先去dealer買一個Toyota正宗油箱蓋換一下(ebay $25 genuine, OEM)，以下的例子換了後燈不亮了

"So, my P0401 error code seems to be the gas cap. I replaced it this morning. Drove about 50 miles in two drive cycles. Got back in the car a 3rd time and the check engine light did not come back on. I have driven it twice now with no check engine light. It was a $22 gas cap from the Toyota dealer. I don't know if that is your problem or not. The dealer service department person told me bluntly that this was not my problem and I was wasting my money buying this part. If the gas cap was the problem it would produce another a different error code. But, for my case, that doesn't appear true. I will keep driving it and we'll see."

換後，斷開電瓶，踩刹車，按無電喇叭消碼；再連上，開60 miles 以上（一個circle），如果換了燈還亮，第二步，去 dealer 買一個正宗 EGR valve，然後找一家車鋪換，dealer 人工一般翻倍。

 

所有跟帖： 

• 非常感謝你這麽詳細的介紹！講得真清楚，這些我應該會做的，不過我肉眼看不出我的的gas cap有壞的地方呢 -anmom- ♀ (0 bytes) () 10/09/2019 postreply 23:17:20

• 不客氣。20年gas cap如沒換過橡膠老化了。碰碰運氣（ebay $25, 找配你車的年份，務必原廠件genuine或OEM） -老金工- ♂ (0 bytes) () 10/10/2019 postreply 05:34:11

• 謝謝你！麻煩你能解釋一下OEM 是啥縮寫嗎？ -anmom- ♀ (0 bytes) () 10/10/2019 postreply 06:56:30

• Original Equipment Manufacturer，就是 genuine的意思。注意有的商鋪自稱品牌為“OEM”.. -老金工- ♂ (95 bytes) () 10/10/2019 postreply 07:14:07

• 謝謝你熱心的行家！我明白了 -anmom- ♀ (0 bytes) () 10/10/2019 postreply 08:14:30

• 汽油蓋擰上後，要聽到一、倆聲 "click"，否則可能會引發engine light on。 -老金工- ♂ (0 bytes) () 10/10/2019 postreply 08:32:37

• 謝謝！這車我開了近二十年從來沒有聽到click 聲，我看車蓋子上有同樣的說明，但我從來擰不到這一步. 但近二十年沒有事，直到最近 -anmom- ♀ (0 bytes) () 10/10/2019 postreply 09:12:12

• 還有有一次加完油我忘了油箱蓋子就開走了，後來dealer那兒買了個新蓋子，所以這蓋子大概7，8年新 -anmom- ♀ (0 bytes) () 10/10/2019 postreply 09:14:44