Sometimes while diagnosing a driveability problem, you can be blinded by the numbers. Fuel trims, misfire counters and grams per second can confuse and lead you down a diagnostic rabbit hole if you do not understand what is going on inside the combustion chamber when the air and fuel are burned.
Understanding what comes out through the exhaust valve is critical to solving any emissions or driveability problem. It may seem basic, but when applied properly it can make solving sensor-related problems a lot easier.
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