Ford Repair: 1995 Ford Probe Engine, exhaust gas oxygen, ford probe engine

Question
A computer diagnostic was done on my 95 Ford Probe 4 cylinder, automatic, and two of the problems found with the engine was the EGR valve was not opening and the EGO was not switching--the voltage was staying low, and excess oxygen was present. The mechanic told me to get something called the HEGO Sensor and so I went onto ExpressAutoParts.com and couldn't find the HEGO Sensor.  Would you be able to help me find what part I need to get from ExpressAutoParts.com, dealing with the HEGO Sensor.                 
                        Thanks,
                            Martin

Answer
Martin-

  The part listed on expressautoparts.com is a Bosch unit, part number 15708.  HEGO is mechanic-speak for heated exhaust gas oxygen sensor...what's more commonly refered to as an O2 sensor.  After entering your make, model, year, etc., for a category go to "sensors" and then as a subcategory click on "oxygen".  It should be right there.  There's another part number listed, but it's a universal part that would require a little tweaking to get in properly.  The 15708 part should be a direct replacement.  Hope this helps.

Steve