Daystar OBDII Plug - "Do Not Flash" Protection For Custom Tunes

About This Product

If you have a custom tune in your diesel truck or performance vehicle, this Daystar OBDII plug is essential protection for your investment! It's a simple but clever device that plugs into your OBDII port and displays a clear \Do Not Flash\ message to dealership technicians. This prevents them from accidentally overwriting your expensive custom tune with stock programming during routine service or diagnostics. The plug is compact and doesn't interfere with normal vehicle operation - it just sits in the port as a visual reminder. I've been using one in my tuned truck for years, and it's saved my custom programming multiple times when the vehicle was in for service. The build quality is solid, and it fits securely in the OBDII port without being loose or falling out. It's made in the USA, which is nice to see for automotive accessories. The package is small and lightweight (only 0.018 kg), making it easy to keep in your glove box if you don't want to leave it installed permanently. For anyone who's invested in custom tuning - whether for performance, fuel economy, or specific modifications - this little plug provides peace of mind that your tune won't get wiped during dealer visits. It's one of those simple, affordable accessories that can save you hundreds of dollars in retuning costs. Seriously, if you value your custom tune, this Do Not Flash plug is cheap insurance against accidental reprogramming. It's become standard equipment for all my modified vehicles!