I've gotten the dreaded p1688 a few times now. Usually when low in the rpm and floor it, when I'm too lazy to downshift. This is in a 2003 cooper s with 99k miles, all stock. Crank pulley doesn't seem to have a wobble. The code that comes up is a map sensor code, but that's through a obx reader and Torque pro Bluetooth scanner. Here's the freeze frame data. I feel like it could be the bpv starting to fail and maybe this time it stuck closed and was more of an overboost code? The map sensor wires don't look to have worn through, I haven't pulled the map though.

I'll dive more into it once I get a tranny job done, anyone have anything else to check? Bpv, crank pulley, map and tmap sensors.

 

 

Today, while driving with intent to diagnose, I noticed that it seemed like it really didn't start boosting well, until 5k rpm. I didn't have my obd2 logger in at the time though. Starting to think it's bpv related.

 

And now with my logger on, I'm boosting 10psI pretty consistently and the big jump at 5k is gone...