|
Re: GM dealer says P0420 caused by downstream sensor. What say you?
Toyota has been having the po420 on many cars . Most of them have a TSB regarding this which is to reprogram the ecm. Login to read more. 
iATN Members:
Login to read this message and participate Auto Repair Pros: Join iATN to read this message and others Vehicle Owners: Find a nearby iATN member to repair your vehicle |
Video