I replace both O2 sensors and then had a blown head gasket afterwards. With all that water leaking by, could it have donw damage to my O2 sensors ?

 

Yes, definately. When I bought my car, it had a blown head gasket. The O2 sensors had been replaced within 3 months before it happened but they were both ruined. I don't know how the one on the sided that didn't blow got ruined.

Dustin

 

On my brother lightning. When he blew one. JDM told him that the coolant plays havoc on them. I would replace them to just be sure.

Mike