Exhaust leak or bad o2 sensor ?

This is more than a car repair forum! Please read and follow the posting rules listed in the right hand sidebar.
Suggestions on what to add to edge of steps on stairs
Only text posts are allowed here. YOU MUST have minimum karma to participate in the sub. Submit here: https://diy.stackexchange.com/Hit fiber feed to my house
A discussion of fiber optic cable and uses and implementations in our lives. Specifically fiber used for internet.What’s the process for registering an out-of-state utility trailer with a bill of sale?
A place for Arizona residents, from the Grand Canyon to Yuma. Covers Phoenix, Flagstaff, Tucson and all the beautiful spaces in between. Topics include life in Arizona, things to do, places to eat, exploring our outdoor trails and parks, news, politics, and much more. This sub is for residents of the state and not a place for tourist / visitor questions. You can also chat with other people in Arizona on our Reddit AZ Discord at: https://discord.com/invite/yWVuTG57ZhWhich one is a better deal ?
The largest Milwaukee Tool community in the world. Sharing tips, info, quality promos, reviews, how-to's, "new tool day", pics of your tools and projects. Open to all, whether it's your hobby or profession. Unaffiliated w/ Milwaukee Tool or TTI; we're started/run by owners, for owners.Already got a corded rotary hammer, but is this a good deal?

The largest Milwaukee Tool community in the world. Sharing tips, info, quality promos, reviews, how-to's, "new tool day", pics of your tools and projects. Open to all, whether it's your hobby or profession. Unaffiliated w/ Milwaukee Tool or TTI; we're started/run by owners, for owners.
Rear view mirror dilema
For The Car Audio and Video beginners to enthusiast to everything in between! Heads, Subs, EQs, etc... Bring it into our show room. Q&A, Advice, Tips, tricks and tech welcome! If you are new to the hobby, you can subscribe, post and view our wiki for basic starting information. If you are a long time veteran, feel free to use this as a form to discuss with other like minded enthusiasts.LPF settings
For The Car Audio and Video beginners to enthusiast to everything in between! Heads, Subs, EQs, etc... Bring it into our show room. Q&A, Advice, Tips, tricks and tech welcome! If you are new to the hobby, you can subscribe, post and view our wiki for basic starting information. If you are a long time veteran, feel free to use this as a form to discuss with other like minded enthusiasts.Gas line predicament
Only text posts are allowed here. YOU MUST have minimum karma to participate in the sub. Submit here: https://diy.stackexchange.com/Utility sink strainer body (red line) is bellow the tee. What are my other options here ? Besides shimming the sink

A place for plumbing advice and help. Do not advertise or try to compare pricing.
ipv6 DNS Servers
This is an unofficial subreddit dedicated for helping Cox Communications customers.Anybody want to save me multiple trips to the hardware store & tell me the name of this part & it’s manufacturer? Id greatly appreciate it.
This is a place for professionals and non-professionals alike to discuss irrigation. Ask a question, ask for help, show off your work (no advertising), or show us what some idiot did. Just keep it cordial. Check out the user and post flair, and think about adding it to your post. If you receive help from this sub, please let us know how we helped you.What came first, the electrician or the plumber?

A place for **construction professionals only** to discuss the industry. Anybody working or interested in working in this field is welcome! Carpentry, concrete, steel, plumbing, HVAC, electrical, landscaping, equipment operators, etc. Those with DIY or homeowner-type questions should use subreddits such as /r/DIY. Those posts will be removed.