Leaking coolant in exhaust pipe from heating exchange

Hi this is Dusty, I'm one of the auto experts on RepairPal's Car Genius team! I wouldn't recommend making any modifications to the vehicle, eliminating a heat exchanger could be detrimental to the vehicle's overall performance and reliability. As for the P0301, that code indicates that a misfire has been detected in cylinder number 1, determining the cause of the misfire could be relatively simple fix like a software update, but unknown factors could make it a more complicated issue. Any issues with the vehicle's hybrid (High Voltage) systems should be evaluated by a competent, trained professional. Hybrid systems can cause serious injury, possibly death if not handled properly. If you have any other questions or would like to help with finding a RepairPal Certified shop in your area, give us a call! 877-913-1554