 Symptoms of a Bad Engine Control Unit ECU What to Look For The Engine Control Unit (ECU) is the brain of your vehicle, managing vital systems for smooth operation. When it starts to fail, you’ll experience several warning signs. While some symptoms overlap with other issues, there are clear indicators that your ECU might need attention. Here are the top six symptoms of a failing ECU:
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 Boost Leak Symptoms Turbo Lag, Acceleration Issues, and More Boost leaks can significantly impact your vehicle’s performance. If your turbocharged engine is lagging, producing black smoke, or you’ve noticed a decrease in acceleration, you may have a boost leak. Here's a breakdown of common symptoms and how to identify them:
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