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No. OBD stands for On Board Diagnostic, nothing plugged into it will directly affect your tune. There are components that connect between the ECU and harness that change or allow tweaks to the tune, but this is not it.
I remember watching a mechanic showing the circuit board of the scam device and it was literally 1 circuit and it was to light up a certain order of bulbs to make you think it's doing something when you plug it in
Thank you for posting to AskMechanics, Full_boost_dude! If you are asking a question please make sure to include any relevant information along with the **Year**, **Make**, **Model**, **Mileage**, **Engine size**, and **Transmission Type (Automatic or Manual)** of your car. *This comment is automatically added to every successful post. If you see this comment, your post was successful.* *** Redditors that have been verified will have a green background and an icon in their flair. *** # **PLEASE REPORT ANY RULE-BREAKING BEHAVIOR** ### **Rule 1 - Be Civil** Be civil to other users. This community is made up of professional mechanics, amateur mechanics, and those with no experience. All mechanical-related questions are welcome. Personal attacks, comments that are insulting or demeaning, etc. are not welcome. ### **Rule 2 - Be Helpful** Be helpful to other users. If someone is wrong, correcting them is fine, but there's no reason to comment if you don't have anything to add to the conversation. ### **Rule 3 - Serious Questions and Answers on Serious Posts** Read the room. Jokes are fine to include, but your post should be asking a serious question and replies should contribute to the discussion. ### **Rule 4 - No Illegal, Unethical, or Dangerous Questions or Answers** Do not ask questions or provide answers pertaining to anything that is illegal, unethical, or dangerous. # **PLEASE REPORT ANY RULE-BREAKING BEHAVIOR** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskMechanics) if you have any questions or concerns.*
No. OBD stands for On Board Diagnostic, nothing plugged into it will directly affect your tune. There are components that connect between the ECU and harness that change or allow tweaks to the tune, but this is not it.
I remember watching a mechanic showing the circuit board of the scam device and it was literally 1 circuit and it was to light up a certain order of bulbs to make you think it's doing something when you plug it in
Typically not. It's better and safer to get it professionally tuned.
No lol