You need the OBDII scan tool to reset the light ("clear the code"). Some auto parts stores (I have heard autozone in particular) will loan you one for free. You can buy a simple scan tool for under $70 (probably under $50 now) that will allow you to scan CEL codes in the future and reset them...I found it a worthwhile investment for my '98.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz