If you are from California and cannot do this, this unit will display permanent DTCs that cannot be cleared. However, this will clear normal DTCs. The number of warm-up exercises is also displayed. This is important in California because if there are more than 15 workouts, permanent codes are ignored. FYI, the warm up in my car is at least 40 degrees Fahrenheit and the temperature is over 160 degrees Fahrenheit.
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