Automotive Diagnostics, Torque & Trailer Wiring

On an OBD2 scan tool live data feed, what does a Long Term Fuel Trim (LTFT) reading of +18% generally indicate?

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 Correct IncorrectA high positive fuel trim indicates the engine computer is adding extra fuel (about 18% here) to compensate for an unmetered air leak (vacuum leak) or weak fuel delivery (lean condition).

On an OBD2 scan tool live data feed, what does a Long Term Fuel Trim (LTFT) reading of +18% generally indicate?

• The alternator is overcharging the battery
• A lean condition, likely caused by an intake vacuum leak or low fuel pressure
• The engine is burning oil in cylinder 1
• The catalytic converter is 18% cold