KlaroOBD2 adapter · Wi-Fi or Bluetooth
Your check engine light,
explained
Plug an OBD2 adapter into your car's diagnostic socket and Klaro reads what the control unit recorded. Fault codes stop being obscure references and become readable sentences, with how urgent they are.
Reading codes and live data are free. Adapter sold separately.
Read the codes
Stored and pending faults, explained in plain words.
Clear the light
Once the fault is fixed, switch the warning light off.
Live data
Revs, temperatures, pressures, sensors — over a hundred readings.
Works offline
No account, everything ships inside the app.
All 921 generic SAE J2012 fault codes, explained
Already have the code?
Every standardised code has its page: what it means, how serious it is, and what to do. The most consulted:
Practical guides
What to know before opening the bonnet — or calling the garage.
Check engine light on: what to do
Steady or flashing check engine light: what it means, whether you can keep driving, and how to find out in two minutes what the control unit has recorded.
Clearing a fault code yourself
How to switch the check engine light off with an OBD2 adapter, what clearing resets, and why you should never do it right before the roadworthiness test.
Which adapter to choose
Bluetooth or Wi-Fi, BLE or classic serial: what to check before buying an OBD2 adapter, and the mistake that makes one useless on iPhone.
The ELM327 adapter will not connect
Your OBD2 adapter blinks but the app cannot see it? Classic Bluetooth on iPhone, wrong pairing, ignition off, faulty clone: the most common causes and how to rule them out one by one.
What it is good for, day to day
Eight situations where plugging in an OBD2 adapter makes a difference: warning light, buying used, roadworthiness test, battery, particulate filter.