Toyota has a lot of merits. But problems arise after engine control module parts have been used for a long time. The Toyota engine control module parts are designed to run the management system (controls fuel mixture, timing, and emissions controls). Signs of bad engine control module parts include engine misfiring, stalling, and performance issues. Welcomes to a lot of nice Toyota products online. Buyers can get great products and services online 24 hours a day and 7 days a week.