Engine service light on

   I know when the engine service light goes on, there could be several things that is wrong with the car. I own a 2004 nissan sentra that this is happening. I understand that it could be my oxygen sensor from what the auto shop worker told me, but he has to place a instrument on it that cost $75.00 an hour to make a diagnosis. Do I really have to go through this and pay for this instrument or is there an cheaper way to get my car up to par?


Have your car’s codes scanned at Autozone or Advance for free and post the code(s) back here in number form like: PO123, etc.

Maybe somebody can give you a diagnosis.

How about engine size and number of miles on the car. Post that, too.
Is this an automatic transmission?