the data connector is under the cup holder, however with the perkins engine you need to have the cat adapter 3 and the est software to connect to the engine. you will need to clean the entire emissions system and verify the egr function in order to get that code cleared. also dont forget to clean the pressure sense tubes. the real question is why the dpf clogged in the first place, if you have a aftermarket diag tool with 16 pin j1939 it might connect but thats a slim chance.
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