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so let me try to understand this...when you have your procede in you use its built in o2 sim and it doesn't give any cells. after you took it out and you put a different o2 sim(bms, RR etc.) and now it gives you cells?
if so, its likely bad o2 sims if they dont appear when the procede is on. DP's are a PITA to just swap and see, but it may be worth it given each sensor is an arm and a leg.
IF you dont have your dp's in and running on the stock o2s with NO sims and procede, its likely your o2 sensors could be damaged or faulty. if you installed your dp's and didn't disconnect the o2s from the harness while taking them off or on the wires could be damaged somewhere.
right now my car is in service getting o2's bank1&2 for cyl1-3 replaced since they would give cells every several hundred miles. the car would idle slightly rough(would go to either 500 or 700rpm when trying to stay at 600). they replaced the rear sensor first and it ran and idled better, but now they ahve to replace the front one since the cell is haunting me.
teri
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