More than likely the fuel lines were removed or replaced which triggered the o2 sensor to go off.
O2 sensor head gasket.
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If its a coolant type leak.
I m worried that i have a blown head gasket that is leaking slowly out of that corner of the head.
The missfire is caused by ignition sys leak or compression problem the o2 sensor only reports the amount of o2 in the exhaust if it is fouled it can cause the engine to go ritch or lean and affect a lean or rich missfire so if you have a check engine light find out.
Oxygen sensor is just that it detects oxygen in the engine.
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I hope they u changed the plugs but the blown head gasket will cause damage to the o2 sen and the cat.
The code indicates the o2 sensor is on the same side of the engine that i see burnt coolant.
If there s a head gasket leak then yes it could.