My car (06 s80 2.5t) currently has 82k miles with ard green tune. It pulls very strong and doesn't have any obvious drivability problems. The code also never triggers limp home mode. However, every time I cleared the code, it comes back after a few days of driving. I installed a mechanical boost gauge and the boost stays perfectly at 15psi and slowly drops to 12psi till redline. 3 weeks ago when I did the wastegate adjustment, there's no leak in the vacuum line connecting the actuator, and it was properly set. I also checked the TCV lines and there's no obvious crack and they were connected correctly. I am wondering under what conditions a p0234 code will be thrown but doesn't cause CEL or limp home mode. Should I start with replacing the TCV? Thx!
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