ELM327 won't connect to Iphone

ELM327 won’t connect to Iphone via bluetooth.
No instructions came with the sensor. No passcode.
How can I make this connect?

1 Like

What adapter do you have exactly? Even though the Nonda adapter might use the ELM327 chip, this is not a general support forum for problems with any ELM327 chip based bluetooth OBD adapter…