View Full Version : hg blown ? about O2's

11-13-2006, 10:53 PM
this was a while back but i blown my head gaskets and wondering when this happens will it mess up the o2's or cats the car was parked soon as hg's went

11-13-2006, 10:58 PM
I've seen the O2 sensors wiped out by the coolant before.

11-13-2006, 11:01 PM
i know it possable but dose it happen alot i put like 2 miles with blown hg's

11-13-2006, 11:02 PM
I have done many head gaskets on 3.8 engines, and if enough coolant gets on the sensor it will kill it.

11-15-2006, 03:31 AM
I have changed headgaskets on three SCs and haven't had to change O2 sensors. On my 89 SC the O2s only had 3000 miles on them so I didn't change them when the HG blew. That was in 2003 and O2s still working fine as I got 25.3 MPG on the trip to the Shootout. If you don't get any codes afterwads I would say they are okay.


Thomas A
11-15-2006, 04:05 AM
I'd say repair the HG and drive it. You will know soon enough if the O2's were damaged.


Scott Long
11-15-2006, 03:06 PM
I didn't change my O2 sensors after my head gasket job either. I took them out and cleaned them with electrical parts cleaner, and then cut off the cats and had new downtubes made and re-used the sensors. I'm sure they could be replaced and I might see better gas mileage, but I have no codes.