Klaus,

I took aaallrighty's advice and went to Auto Zone and used their scanner. It said the following: H02Sll slow response (heated oxgen sensor bank 1 sensor 1)

Listed Probable causes: BB1. - Oxgen sensor defective
BB2. - Fuel system running rich or lean-check other codes first.

I asked the clerk if he could tell me which sensor was bad (front or rear)? He said he couldn't tell. Based upon what the print out says, do you think:

1) It's the front sensor that's no good?
2) Do you think it is more likely a defective sensor versus vacuum leak causing the car to run rich or lean? The car's idle sounds the same as usual. No other codes suggesting the fuel system was running rich or lean were indicated in the scanner. Any other way to look for additional codes to indicadte if this problem is present?

Klaus, as always, thanks and thanks to all of you have responded.

Hugh