i changed my rear differential fluid and now the engine light is on and i cant g on 2007 Mazda CX-7

I cant accelerate when i touch the gas.What could they have done.No problem yesterday a hr after it was done but now

by in Clifton, NJ on March 06, 2013
1 answer
ANSWER by , March 06, 2013
No connection that I know of! Have a scan test done.