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Some of the important engine performance indicators that need to be monitored are short-term and long-term fuel trims. Fuel trim is the calculation of the fuel-air mixture performed by electronics to maintain the ideal ratio of fuel and air in the fuel-air mixture. Fuel trims are usually indicated in %. The car maintains a fuel-air mixture ratio of 14.7:1. An experienced diagnostician explains why a lean mixture is dangerous and talks about some of the reasons that can lead to it. You can measure fuel trims with Motordata OBD. Download Motordata for free on Google Play https://clck.ru/avJnc AppStore https://apps.apple.com/by/app/motorda... Huawei AppGallery https://appgallery.huawei.com/#/app/C... Unfortunately, in Russia you can now buy plugins for advanced diagnostics for Android phones only in the application in the application downloaded through Huawei AppGallery. Payment is made from the account of the mobile operator.