Service engine light soon, as well as O/D off light indicator on
There is an emissions related issue that has been detected by your car's On Board Diagnostic (OBD) computer. You should have the OBD scanned to help identify the problem for you to attempt to fix - or assist your mechanic to narrow down the problem to correct it.
"O/D Off" usually mans that you'd disabled the high(er) range of the transmission (called "overdrive"). At cruising speed now, the engine will spin faster - using more fuel. The vehicle will speed up more quickly when O/D is off, but at the cost of using more fuel. You will likely hear the engine running louder / faster as a result. You may find a button or switch on or near the gearshift or dashboard to turn O/D On again. You can run it either way - but usually turn it off when towing or extended climbing.
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