I am not trying to ramble, but I want to be as detailed as possible. I have searched the site for multiple evenings, and I am unsure of the next step in repairing my car. The nearest Volvo dealer is 70 miles, and the local import shop here wants $2000 to fix the problem. I am seeking knowledge to potentially fix it myself.<br>I have a 2001 v70 t5 with 145K miles on it. I had a local mechanic do the 100k service, and once he completed the job, the CEL came on. However, the car ran fine, and the guy is a really great mechanic. So, I was not overly worried, and he suggested running some injector cleaner through the engine and cleaning the mass airflow sensor. I did these two things, and the CEL remained on, however, the car did continue to run fine. After a bit of time, the car seemed to become a little bit less spunky, and the light finally began to annoy me. So I took it back to the mechanic, and he checked the codes, and reset them. Once this happened, the car ran horribly. His reader did not have the specific volvo codes, but it did have a basic code about the turbo sensor. In the end, it was beyond him on what to do next.<br>I read many posts about reseting the computer and such to relearn how to function properly, but nothing worked. The turbo never even engages anymore. There is absolutely no power, and in general, my '91 tercel could kick it's ass off the line. I finally took the car to the local import shop which does a lot of work on volvos.<br>The codes that were showing are P0237 and P0236, a turbo boost sensor low signal and range performance fault respectively. <br>The shop's interpretation was "wastegate or turbo has failed, need to disassmble and inspect turbo condition". In the end, he felt the turbo was probably shot, and would need replaced for $2000, a common problem for this make of car according to them. I guess my question is, what is the best choice of action? I do not mind replacing parts, but I am unsure of how to check which parts to replace. I have read about adjusting the wastegate, but not on how to test to see if it is completely defunct. Also, could it be the TCV? Is complete turbo failure a common problem? If so, is it possible for a relatively competent person to replace himself? Thanks in advance.