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You will need to invest in an OBD II code reader to access the specifics of trouble codes (lighted Service Engine Soon indicator). These readers are available at auto parts stores ranging from around $50.00 to over $400.00. You can find a good code reader for around $100.00 that gives the code and description and allows you to "reset" the system and loose the code, at least temporarily. This is useful to see if the code reappears or was a quirk. The code readers have an attachment that plug into the diagnostic port typically located under the steering column to one side or the other.

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Q: How can you check the code for your emissions system in a 2003 Nissan Pathfinder?
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