Replaced all 6 spark plugs

Ever resolve this problem????

Haveing same issues did you ever figure this one out?

Ok so the misfire codes went away and now have PO420 “Catalyst System Efficiency Below Threshold (Bank 1). and PO430 “Catalyst System Efficiency Below Threshold (Bank 2). codes

Sorry auto correct both upstream o2 sensors

Original code was just a misfire for cylinder 5 which also blew the ignition fuse. Replace all 6 spark plugs all looked good. Then got codes for both upstream box sensors. Believe they were low efficency codes. The replaces both o2 sensors. Then got mud fire code for 6,5,and 4 and random misfire. Go...

Vehicle is a 2011 Volvo XC90

Okay let’s start from the beginning So Volvo broke down on the highway on the wife towed back to the house and pulled codes. Had misfire for number five. Found number five cracked and started to melt. Replace coil five and all 6 spark plugs. Then the Volvo got a O2 sensor code for the upstream and i...