First of all, you need to check what is wrong with the engine. Pull the
spark plugs out and see if you got abnormal colors on the white insulator.
If you got black spark plugs, then you are burning oil.
How many miles are on the car?
Check your transmission fluid level... is it low?
How about your engine oil level?
What does your exhaust smell like? Raw gas? Oil? Transmission oil (acrid
O2 is located in front of the cat converter...Usually in the smaller cat
converter closer to engine. You will see one wire.