FlatDiag turns cryptic fault codes and dealer-only coding into clear, tap-to-fix answers, right from your iPhone, your Mac, or the car's CarPlay screen. Plug in an OBDLink adapter and read, clear, and customize your car like the pros, without the $10,000 tool.
Built for the Porsches people actually drive
Coverage varies by model, year and equipment. Demo mode lets you preview the full app before you buy anything.
Real screens from the app in demo mode. Look around before you connect anything.
No hex. No guesswork. Just clear answers and one-tap actions for your car.
FlatDiag reads every fitted control unit and explains each fault in one clear sentence, grouped by system and ranked by severity. Fault codes are shown with their exact code and a clear description, backed by an offline library of 179,000+ Porsche codes, so you stop Googling P-codes.
Unlock factory options and personalize your car: comfort, lighting, gauges, and more. Browse coding by module with friendly names instead of raw values, and apply changes in a batch.
Every coding change is automatically backed up first. Changed your mind? Restore the original in one press. FlatDiag confirms each write and reads it back to verify it took.
Watch real-time engine values like RPM, temperatures, speed, and load in a clean tile grid, or put them on the car's screen with CarPlay. Flip between metric and imperial with a single tap.
One tap finds every control unit in your car: engine, transmission, ABS/PSM, airbags, and even the seat, door, and body modules that live on a separate network and that most tools miss. Search the list by name, and clear a code to have FlatDiag re-read automatically.
Run guided service procedures with step-by-step prompts, like seat calibration, safely gated behind a battery check and your confirmation. More routines are being added and validated on real cars.
Pop an OBDLink CX adapter into your Porsche's OBD-II port, under the dash on the driver's side. No tools, no wiring.
Open FlatDiag and pair over Bluetooth. Your car is identified automatically by its VIN, so there are no setup screens to wade through.
Scan for faults, clear what you've fixed, watch live data, apply coding, and run guided service routines, all in plain English and all from the driver's seat.
Changing how your car behaves should never be a leap of faith. FlatDiag is built so that every write is deliberate, reversible, and verified.
No laptop, no dealer appointment, no subscription. FlatDiag runs entirely on your phone.
For most Porsches: a compact Bluetooth-LE dongle that connects fast and stays connected. It plugs into your OBD-II port and talks to FlatDiag wirelessly.
Buy on AmazonThe newest Porsches, like the 992 and Taycan and other DoIP cars, connect over automotive Ethernet. This ENET adapter links them to FlatDiag.
Buy on AmazonFlatDiag is a native app for iPhone, with the same tool on Mac and a live dashboard on CarPlay. Bring the devices you already own, and the whole thing fits in your pocket.
No cloud account, no monthly fee. Your scans and coding backups stay on your device, private to you.
As an Amazon Associate, FlatDiag earns from qualifying purchases. Adapter links on this site are affiliate links; if you buy through one, FlatDiag may earn a commission at no extra cost to you. See our disclosures.
No. FlatDiag is an independent app and is not affiliated with, endorsed by, or sponsored by Porsche. "Porsche," "PIWIS," the Porsche model names, and Porsche feature names (such as PASM, PDCC, and Sport Chrono) are trademarks of their owner; we use them only to describe compatibility.
FlatDiag is built to make coding safe and reversible: every change is backed up first, you confirm each write, and the result is read back to verify. Stick to documented options, keep battery voltage healthy, and you can always restore the original in one press.
An iPhone you already own and an OBDLink CX Bluetooth adapter. That's it. No laptop, cables, or subscription.
FlatDiag spans Porsche's KWP2000, UDS, and DoIP generations: the 911 (997, 991.1, 991.2, 992), Boxster & Cayman (987, 981, 982), Panamera (970, 971), Cayenne (957, 958, 9YA), Macan (95B), and Taycan (J1). Coverage varies by model, year, and equipment; Demo mode lets you explore the app before committing.
Yes. FlatDiag is in TestFlight beta and actively improving. Request access and we'll send you a beta invite, plus news when it reaches the App Store. Prefer to look first? Demo mode lets you explore the whole app with no car connected.
Both. FlatDiag is one app that runs on iPhone and Mac, and it shows your live data on the car's CarPlay screen while you drive.
Yes. Diagnostics and coding run on your iPhone, and your backups stay on your device. There's no account to create and nothing uploaded to a cloud.
FlatDiag is in TestFlight beta now. Drop your email for a beta invite and launch news. No spam, just FlatDiag.
We'll only email you about FlatDiag. Prefer email? nick@flatdiag.com