Unplug the sensor from the wiring harness, and get a special O2 sensor socket from the auto parts store (some loan them out for free) and remove the old sensor from the exhaust bung. If the sensor won't budge, try more penetrating oil or attempt the removal with the engine warm (be careful not to burn yourself).
However, a mattress that is too soft is just as bad for low back pain as a mattress that is too firm. In a 2005 study, The Journal of the Canadian Chiropractic Association pointed out that in a survey, 76% of orthopedic surgeons recommended firm mattresses.
(I have also started a thread called Hotel loyalty cards/ programmes by posting a very long [and, I hope, comprehensive] article on the subject). [font=Garamond] Mattresses by Parvez Dewan Even the ultra-budget Tune Hotels have spring mattresses. Latex and other foam mattresses belong to the mid-20th century. However, a number of hotels have opted for tempurpedic beds (John Rutledge, Sanctum). These are made of a NASA-discovered and Sweden-developed material called tempur. Marriott s B-list hotels use foam mattresses.