my 2003 allroad water temp gauge is suddenly not reading straight up vertical when car is warmed up. Needle only comes up to 2/3 or 3/4. Changed water pump, timing belt and thermostat only a couple months back. Is it possible the water temp sender is failing? It was changed under warranty previously. Both rear O2 sensors need replacement and are throwing codes. Will replace both when parts arrive. Are these related issues?