2001 Accord V6 abs speed sensor

Don’t ‘hammer’ on the sensor you will damage it. The best thing to do is work around it and leave it alone as you should not need to remove it to replace a ball joint but if you need to take it out the only hope you have is to soak it with penetrating oil and then work it back and forth with a pair of channel locks but even doing that you could break the sensor and have to replace it.