www.rdforum.org: Troubleshooting a sensor check failure @Vortex, did you ever come up with a solution for the issue you had in the thread listed above? Reading around, I think it is more of a wiring issue vs a sensor issue. I dont get the warning every startup. Maybe twice a week at best. Even then, I reboot the alp all heads work fine. Wiring and sensor will have to be sent in to Tom for testing. I was wondering during the down time, do you all just drive the psl with one head missing? Do you have a spare head for situations like this? Thanks in advance.