Question:I've already done a lot of work to a 2000 3.3-liter Nissan Frontier Crew Cab. It runs bad and has two codes, P0300 and P0400. I spoke to a mechanic who thought I should change the ...
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What Do Car Trouble Codes Really Mean?

Your vehicle has a problem if the check engine light (CEL) glows. Diagnostic trouble codes (DTCs) stored in the computer help find the cause.