Hi Frank, I'm pleased to assist you. I'll get back to you on the warranty later. First and foremost, this set of struts does not fit the vehicle. We have the right parts for your 2011 Nissan Sentra SL 4 Cyl 2.0L, and they come with a 1-year unlimited mileage warranty. Following your order, you can choose a Lifetime Replacement, which is indicated in the top right corner. To view and continue to order at discounted prices today, click the links below, while supplies last. I hope this helps. Enjoy your CP shopping experience! Driver side - https://www.carparts.com/details/Nissan/Sentra/TrueDrive/Shock_Absorber_and_Strut_Assembly/2011/SL/4_Cyl_2-dot-0L/REPN280548.html?can=CPGG4850_CSQA_20230322 Passenger side - https://www.carparts.com/details/Nissan/Sentra/TrueDrive/Shock_Absorber_and_Strut_Assembly/2011/SL/4_Cyl_2-dot-0L/REPN280547.html?can=CPGG4850_CSQA_20230322

Hi Lance, I'm glad to assist you. We suggest having them replaced by a professional. I hope this helps, and if you're interested in these strut assemblies, you can click on the link below for direct ordering to take advantage of our ongoing discount and limited stocks. Happy shopping. https://www.carparts.com/shock-absorber-and-strut-assembly/truedrive/set-repn280547?can=CPAE1047_CSQA_20221121

Hi Victor, I'm pleased to assist you. Yes. This set of loaded struts is compatible with the 2010 Nissan Sentra Base, S, SL, and SR, all engines. If interested, click on the link below to order at 49% off the regular price today while supplies last. I hope this is helpful. Enjoy shopping at Carparts.com! https://www.carparts.com/shock-absorber-and-strut-assembly/truedrive/set-repn280547?can=CPGG4850_20220405

Hi Gaven, I'm glad to help you out. We don't recommend using lowering coil springs for this item. You can use this link to go back to the item page and continue the order: https://www.carparts.com/shock-absorber-and-strut-assembly/truedrive/set-repn280547?can=CPAP3648_20220314 I hope this helps. Happy shopping.

Hi Terrence, I'm glad to assist you. No, they won't. Please use our vehicle selector located at the top of the page. Make sure to enter the exact year, model, submodel, and engine size of your vehicle. Our website will tell you automatically if the part you're looking for will be a guaranteed fit. You can also browse down at the vehicle fitment information section to see more details on the application. I hope this helps and happy shopping.