2012-2014 Chrysler 300 | C AWD, C John Varvatos AWD, C John Varvatos RWD, C Luxury Series AWD, C Luxury Series RWD, C RWD, S AWD, S Luxury Series RWD, S RWD
A: NOx is a byproduct of combustion chamber temperatures and mixes with ROCs, HC, and sunlight to form ozone and smog. The EGR system reduces NOx emissions by recirculating exhaust gases and cooling the combustion chambers. All engines use an EGR system with PCM, EGR valve, and various sensors. Component replacement involves removing the EVAP purge solenoid valve and disconnecting electrical connectors before replacing the EGR valve and EGR pipe. New gaskets and seals should be used and proper torque should be applied to mounting bolts. V8 engines have similar replacement procedures.