In the past, mechanics diagnosed engine issues by sound, smell, and manual component swapping. Today's vehicles feature up to 80 on-board control units. When a check engine light illuminates, it represents one of thousands of codes. High-tech scanners query the ECU directly, viewing real-time sensor loops to see exactly where fuel trim or ignition timing is failing. This prevents unnecessary parts replacement, finding the exact wire or sensor at fault.
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Notice Slower Acceleration?
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