If you Cavalier 98 z24: after driving in rain your rear mats were all wet in 2 days all dashboard light lighted up check eng oil seat belt what is the reason how to fix such problem possible reasons?

I had the same problem and it was the driver's rear shock tower had rusted in a section and was allowing water to seep in from the wheel well into the rear when it rained or snowed. I would definitly get that checked, or if you can re weld some metal there to do it yourself. Hope this helps.