All cars manufactured for sale in the US since 1996 have been equipped with OBD2 diagnostics. They require a tool to reset the CEL or read the codes. Generally refered to as a "scanner". Scanners come in all price ranges, $39 up to over $4000! Prior to 1996, owners could reset their own CEL or flash out the codes, proceedure varied by manufacturer, usually no tool required. Any chance your 2007 is still under warrenty? Check with a dealer. Many auto parts suppliers will read codes for you at no cost. Autozone advertises this service, hopeing to sell you some parts.
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