Help identify CEL code please

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Google "4crawler engine codes", it's the first hit. 4crawler knows everything. 4crawler is your daddy. 4crawler will tell you anything you need to know. :D
 
yup code 21. make sure you get a denso 02 sensor. Our trucks seem not like other brands. Rockauto and partsgeek seem to have them for about $60.
 

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