Not the air filter, not the tow.....disconnect the battery and I would test but you probably don't have a tester and then re-connect. Nothing you did caused the problem. That much I know for sure. Disconnect and then re-connect. How do you know the turbo isn't working?I haven't done anything to the turbo as far as taking it apart so it should be connected. The battery is relatively new. It is a Gel battery so it won't freeze. The only thing I can think of is we towed it about a mile with my Side by side. We pulled it with a snowmobile tow rope. I didn't remove the belt or anything so I don't know if the towing did anything to it. I haven't really done any diagnostics to it yet for the battery, so I'll be doing that, but I didn't know if someone might have a suggestion as to where to start. My son said to check the air filter which if dirty might affect the turbo. I'm 200 miles away from the sled so I have to get ideas and then go to the sled and try them. Thanks for the reply.