We have an LG gas stove that we bought in 2010. A couple of weeks ago it started giving us F11 errors when preheating. Google said the most likely cause was a bad igniter, so I found a compatible part on Amazon for <$30, compared to $160 for the OEM part.
It took maybe 40 mins to disassemble the oven, install the new part, clean things up and put it back together. The oven went from 0F to 350F in 12 minutes, which Google says is approx 3 mins less than average. I call that a win.