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The post is old, but answer can be useful for others. As transmitting spins from engine to the wheels is done by ''oil turbine'', there is often common problem of to high oil level in the automatic gearbox. Oil level must be measured in warm gearbox oil only. If oil level is to high- the oil pressure making wheels to spin, will be ''eaten'' by the oil, which should not be in the way of transmitting energy. Example: if you spray the water to a wall, with high pressure cleaner- there is pressure on the wall. If you try to spray water in same way, but thru the falling water in between of pressure cleaner and a wall- you get no pressure on the wall or low pressure, as the falling water will cut part of energy. There can be many small problems, which couse the oil level change. Changing oil, often service put inn same amount- they should alit less every time, and refill after some days, as there is small amount ''growing'' in side the gearbox by time. No one care, as it is not much, but by long time, older car- best is to recheck oil level at least 1 time a 5 year. Metal ''scraps'' go down to magnet- lift up oil level. Common problems after changing oil in automatic gear box: Revers not working one or more gear cant engage disengaging gear (often while in standing, and not driving, exception- reverse.) Couse: to high oil level in gearbox air bubble in gearbox mechanical computer (gearbox control module) Gearbox mechanical/oil pressure computer, is based on pressure it gets. If there is some air after oil change- pressure will act same as with the braking system when there is air (unstable pressure). This can couse some gear to not engage, as it mechanically engaging by oil pressure in the ''computer''. Solution- removing air from gearbox control module. How- can't help with that. Couse to disappear of revers, can be one of the given common problems after oil change. The other place to search if it is not after oil change or oil level to high: electronic control module for gearbox (usually on the left side under the hood, or outer- near the left front wheel, over the plastic covers) Pistons in the mechanical control module is jammed or mowing problems (mechanical computer-mechanical control module sits on the side of the gearbox, and usually has plug with many wire, which is tightened with a screw to the control module) UPPS!!! -calibration can be required after replacing electronic. Electronic control module can be replaced with a same, or same kind- must research. It will act strange if replaced with the not compatible. Mechanical control module can be unscrewed, checked, replaced with compatible to the electronic control module. Hope it will help to people.