Still working on old junk. My truck has recently started to throw a consistent 2 trip check engine light, in addition to the periodic evap CEL.
Inspection expires end of November. The evap CEL is so periodic that I can clear codes and get all systems to a ready state except evap which is always the last to clear, so 1 not ready = a pass for NY OBD2 tests.
Did the after-cat exhaust on the truck a couple months ago. P0420 research has led me to believe it might be an exhaust leak before the 2nd o2 sensor. Climbed under the truck hoping to find a loose bolt right after the cat but before 02 sensor but no such luck. Second step was to start the truck and check for a leak. Very slightly exhaust leak right after the cat. A bit frustrating as I used all new gaskets and hardware on everything I changed. The flange after the cat is a bit worn away from rust over the years., so i can't really tighten the bolts down anymore, its already flange on flange. The last time I had the exhaust change for muffler I took it to a small shop that reused all the old gaskets and cross threaded things, but never had a P0420 with the orange permatex they used.
I stopped at Napa this morning and got myself a new exhaust gasket, and also some high temp sensor safe permatex. The hardware is all new so it should be pretty simple to take out the 2 bolts, drop the pipe and inspect the current gasket. I might just apply a healthy coating of permatex and send it, or maybe switch out to the new gasket. I am pretty sure the new gasket I put in there was a cone shaped type, where as the one Napa gave me is the flat type. Just need to get it sealed up enough to clear the codes and drive for a couple days to pass OBD2 inspection.
Anyone ever deal with one of these codes? Hoping its not going to turn into o2 sensors or an actual issue with the cat.
Inspection expires end of November. The evap CEL is so periodic that I can clear codes and get all systems to a ready state except evap which is always the last to clear, so 1 not ready = a pass for NY OBD2 tests.
Did the after-cat exhaust on the truck a couple months ago. P0420 research has led me to believe it might be an exhaust leak before the 2nd o2 sensor. Climbed under the truck hoping to find a loose bolt right after the cat but before 02 sensor but no such luck. Second step was to start the truck and check for a leak. Very slightly exhaust leak right after the cat. A bit frustrating as I used all new gaskets and hardware on everything I changed. The flange after the cat is a bit worn away from rust over the years., so i can't really tighten the bolts down anymore, its already flange on flange. The last time I had the exhaust change for muffler I took it to a small shop that reused all the old gaskets and cross threaded things, but never had a P0420 with the orange permatex they used.
I stopped at Napa this morning and got myself a new exhaust gasket, and also some high temp sensor safe permatex. The hardware is all new so it should be pretty simple to take out the 2 bolts, drop the pipe and inspect the current gasket. I might just apply a healthy coating of permatex and send it, or maybe switch out to the new gasket. I am pretty sure the new gasket I put in there was a cone shaped type, where as the one Napa gave me is the flat type. Just need to get it sealed up enough to clear the codes and drive for a couple days to pass OBD2 inspection.
Anyone ever deal with one of these codes? Hoping its not going to turn into o2 sensors or an actual issue with the cat.