Check all sensors on engine harness. Cam sensor, exhaust pressure, maf sensor, egr valve, crank sensor, pdf sensor and swirl motor. Is the mode done on swirl motor. If not unplug swirl motor and install resistor 4.7k 1 amp in 2 middle pins or get plug at Jeep Mercedes OM642 Swirl Motor Simulator PlugI've taken it back to the dealer 3 times for limp mode... Dealer can't fix it what do I do? Anybody have any ideas