I hope they u changed the plugs but the blown head gasket will cause damage to the o2 sen and the cat.
O2 sensor head gasket.
More than likely the fuel lines were removed or replaced which triggered the o2 sensor to go off.
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The code indicates the o2 sensor is on the same side of the engine that i see burnt coolant.
If its a coolant type leak.
Oxygen sensor o2 what else could cause rich or lean codes replacement of a good oxygen sensor o2 is a common mistake made by diy mechanics all the time.
If there s a head gasket leak then yes it could.
Kax 234 4209 oxygen sensor original equipment replacement 234 4209 heated o2 sensor air fuel ratio sensor 1 sensor 2 upstream downstream 1pcs 4 4 out of 5 stars 16 26 99.
So before replacing any of these sensors you must first find the real problem that pushed you in that direction.
I m worried that i have a blown head gasket that is leaking slowly out of that corner of the head.