Mercedes CLA Forum banner

cel

  1. Will removing my resonator and muffler cause a check engine light

    CLA Performance
    So i removed my muffler already and everything is fine, but the other day i put on new dual tips and the CEL popped up. I put the stock tips back on and the CEL went away, so i was wondering if i took out the resonator would it pop up again or will i be fine and why did it come up when i put new...
Top