Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be be posting a replay ASAP
what is the problem with car ?
does it say manufacture control and no number after that ?
Please let me know
Thank YouChad FarhatASE Certfied Technician
what is the mileage on it ?
do you have a like major lack of power ?
the P0420 is the catalytic system below efficiency , if you clogged up that is the problem ?