blklscmd
Well-Known LVC Member
I wanted to know the symptoms of a bad cat?I have a 97 lsc i bought for 400 dollars with a bad headgasket he told me it had codes for both side cats.So i had a 67k 98 engine installed so of course the driver side code went away.The passenger code kept coming back so i put another o2 sensor in it hasnt came back yet.My message center mpg wont go past 9.7mpg it kills on gas i wanted to know if a cat is bad will putting a fresh o2 sensor in cover it up for a while.Everything that can be tuned up is all up to date.