回複：初次DIY成功並請教下一次

這是請教的部分.怕WXC又把我的貼子搞沒了,所以分開發.
前一陣我的2000 camry Check Engine 燈亮了, 查code是P0401和P0446.
拿到車行去看,結果是這樣的,

Run diagnosis test and found trouble codes P0401 – egr flow insufficient
and P0446 – evap emission control system/vent control system.
Per test charts performed diagnostics on the egr system and found
the valve sticking and the switch n/g.
Continue with diagnostics test on the evap system and found
the evap canister n/g and the valve stuck n/g.

請教這樣的診斷是不是可信? 怎麽會四個東西一起壞呢?
如果真是這四個東西都要換, DIY的難度怎樣?有什麽需要注意的地方?
車行說這些東西壽命到了, 我覺得有點不太信, 因為車子才跑了7萬5miles.
請各位高手踴躍發言. 多謝多謝.