O2 sensor is well below RM100 as its almost universal. Only different is some got built in heater to speed up the sensor heating process so engine runs cleaner quicker. U will notice older car have their sensor with only 2 wires. Newer car got 3 and sometimes 4 wires. The sensor ideal working temperature is very high.I think now the issue is only the speedometer issue. Got $$$ will buy a 02 sensor swap out. This month burn too much $$$ on this car already.hahahahahaha
U can feel smoother engine once new sensor is installed and best of all...better fc
Talk abt fc, its very recommended to replace the fuel filter. Its an easy DIY job. Smoother response but bad fc...Bad coz u tend to accelerate harder..hihihi