99 Z 3 2.5 code for exhast side cam sencer - replace no start - readings on scanner for sencer are negative range even with new sencer - just for grey area - tried crank sencer - no start - can hear fuel pump run & wont attemt start on just a bit of starting fluid - is there relay problem or computr issues on these cars?

Relay no. computers yes. i have replaced computers before. but first i would try to get a labscope, (oscilloscope) and monitor the reading directly out if the sensor itself and compare it with the reading you get with the scanner. if they are different then i would have to say it is a faulty computer. but just double check it.