Quote:
Originally Posted by Fuel-It!
Bypass plug is totally worthless. If going in you need to remove any aftermarket wiring harness or they will document it and deny coverage if anything comes up down the road.
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TOTALLY INCORRECT. Believe it, if it helps your financial situation with JB4. But it is false info to ameliorate not having a bypass plug available.
Possibly your SD will deny your warranty, etc. with a harness only, could happen. But your SD isn't all SD's.
I have 40,000 miles of warranty work done with the SD knowing the harness is there without a problem. On multiple BMW's.
I also know my SD will flag a Box. Any box and it has happened on this forum.
If you want to split hairs, an anal SD can have the DME inspected with all physical traces removed and still find parameters beyond the factory hysteresis and deny warranty. Removing a box and harness does nothing to prevent that. Telemetrics also is a potential.
Just don't lump all SD's into one category. Some probably do not care even if you have the box on the car.