I have a 2018 Ram 5500. Today I was pulling a load going up a bridge and the dash said exhaust system service see dealer then the check engine light came on!! While the dash said exhaust system service see dealer the truck slowed down for about 5 seconds until icon went off. This happened about every 10 minutes. I checked the codes and I was getting p2509 and p0087. After I reset codes I get the p0087 and the exhaust system service see dealer. What to do?
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