No PID return

[CoCo24]

Hi,

I have a 1998 Opel Vectra B who have a K-Line, and I recently received the OBD2 I2C Adapter. When I try the "rpm_led_i2c" sketch, obd.init() seems to be OK (I added some Serial.print) but when the Arduino reach obd.read(PID_RPM, value), it's return some weird and wrong values (an old value that was stored in "int value", like 1281 or 18177).
Please, can you help me ? I desperately tries to run the adapter

Thank you,
CoCo24

[stanley]

Can you run the OBD example sketch obd_i2c_test and let me see what the output is?