<p><strong data-redactor-tag="strong" data-verified="redactor">On-board diagnostics.</strong> (Not a member of <a href="https://en.wikipedia.org/wiki/Ol%2527_Dirty_Bastard">the Wu-Tang Clan</a>.) When your Check Engine Light goes on, a mechanic will plug in an OBD reader. The car will spit out a code, which tells the mechanic what the issue is. On-board computers became standard alongside computer-controlled fuel injection, and the OBD-II standard has been mandatory on cars built after 1996.</p>

out of warranty

How to Get Repairs Done on Out-Of-Warranty Car

There are no guarantees, but it's possible to get the dealer to fix your car for free even if its warranty has ended.