Quote:
Originally Posted by pokeybritches
The DME can't be locked from OBD read/write. There are things that can be done to prevent certain tools from accessing the DME on the bench, but I've never had an issue with OBD read/write.
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Following up on this, yes the ECU can now be OBD read locked but not write locked- at least not intentionally.
Every flashing program uses a different method to patch the ECU to accept tuned files. Since you can’t double-patch the ECU and have it function correctly, you are essentially locked into using one tuner’s program unless you flash in a full factory file to “clear” the patch… or your tuner’s flash program has to be smart enough to check for an existing patch before writing the tune.