Back in the day, it was up to the individual mechanic to determine what was wrong with your vehicle. Now Electronic Control Units (ECUs), which are present in all modern cars, help mechanics figure out and fix vehicle issues quickly.
When the ECU in your vehicle detects a problem, it will turn on the “check engine” light. A mechanic can then plug into the vehicle and download the error report recorded by the ECU.
It’s true that anyone who knows what they’re doing can plug in and download the ECU error report. So why is it a good idea to bring your vehicle in when the check engine light pops up?
Even if you know what’s wrong with your vehicle, fixing the problem is another thing entirely. An experienced mechanic can interpret the error report and determine the best solution for fixing the problem.
There are also certain issues that won’t cause the “check engine” light to go off. A mechanic can examine your vehicle inside and out and get you back on the road in no time!
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