I have a 2005 Saturn Ion 2.2L, I have just replaced the spark plugs, Ignition Coil pack and the ICM because the car gave me a PO300 multiple misfire code. After changing those the car runs fine but now the check engine light came on and it gives me a PO420 Low catalytic efficiency code. My question is, should I replace the Catalytic converter?
have the same problem?
Monday, September 10th, 2012 AT 6:21 PM