Don't know what is a LTH, so can't answer that one.
Since you know it's an O2 sensor, which bank (1 or 2) and which sensor (1 or 2)?
The upstream sensor (no 1) is before the catalytic converter and close to the exhaust manifold to provide feedback to the ECU, keeping the air/fuel mixture correct for driving conditions.
The downstream sensor (no 2) is there to measure efficiency of the catalytic converter.
Steve