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.
The Rule Of Thumb. Both industry leaders and Sleep Council suggest you replace your mattress after 8 years of continuous use. By this time itâs old and worn out, and loses its form, becoming uncomfortable and lacking support. This can lead to neck and back pain, and trapped nerves.