Some 2017-2018 Edge vehicles with 3.5L engines and MKX vehicles with 3.7L engines may exhibit an illuminated MIL with DTC P013C in the powertrain control module (PCM). This may be due to an exhaust system leak. Exhaust leak inspection should be conducted before performing Powertrain Control/Emissions Diagnostics PC/ED Manual diagnostic routines. Inspect for carbon soot/moisture witness marks at all exhaust connections and catalyst monitor sensor (CMS) threads. Refer to Workshop Manual (WSM), Section 303-14C. Inspect CMS crush washer to confirm sensor is fully seated in the exhaust pipe. Apply soapy water to exhaust connections including CMS threads, while exhaust flow is restricted at the tailpipe and exhaust system is pressurized at 5 PSI (do not exceed 5 PSI), will increase ability to identify and confirm leaks.
