you are probably right. they read the codes and its process of elimination. I still have the SES after changing the front and removing the battery. drove the car and still had the stutter probably, I could floor it and it feels like the car is cutting the Revs, feels like the throttle is closing on me.

maybe once I change the rear sensors, but seems like my process of elimination will take me to replacing the cat converter also.

anyone think I need a scanner/code reader to clear the codes or will disconnecting both battery cables for 20 minutes do it?

thanks everyone for your suggestions