If I remove the catalytic converter on my 2002 3.0 X - type Jaguar do I need to remove the OS sensor too?

Yes, if you remove the catalytic converter from your 2002 Jaguar X-Type, you will need to address the oxygen (O2) sensors as well. The O2 sensors monitor the exhaust gases to adjust the air-fuel mixture for optimal engine performance and emissions. Without a catalytic converter, the sensors may give inaccurate readings, leading to potential engine performance issues and triggering check engine lights. It's advisable to consult a professional or consider using an O2 sensor simulator if you decide to remove the catalytic converter.