One will be aircon staus and the other engine temp status? The auto software has programs for when the A/C is on and when engine temp is high. The other thing it could be is what Aussieblue mentioned as the engine ECU has a stratagie for when the car is in reverse. Torque reduction mode to protect the reverse gear. I know in that mode it sends a freequency 25hz or 50hz depending if its in reverse or not
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