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 suggest you use my experience as a starting point to decide which memory foam mattress is best for you. My Top 5 Reviewed Memory Foam Mattresses Iâve reviewed a number of memory foam mattresses, with the four below ranking at the top for value, luxury, budget, and comfort. 1  Overall: Amerisleep. 2  Value: Loom and Leaf. 3  Ideal For Side Sleepers: Layla. 4  Best If You Want To Sleep Cool: Bear Mattress. 5  Budget: Zinus.