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If your check engine light comes on and a PO401 code on your Toyota Camry, don’t worry. Follow these easy steps and chances are you will be able to repair it yourself. The the main culprit is called a VACUUM SWITCH VALVE (VSV). If not, it will be your EGR valve, your vacuum control modulator, or as simple as your gas cap. Hope this video helps! And if it did , please help me by liking and subscribing! Appreciate it!