I/M Readiness on the V310 Before an MOT
Short answer: open I/M Readiness on the V310 to see which monitors are complete, and read any stored engine code first.
Plug the lead into the 16-pin OBD-II port and turn the ignition on. Choose Read Codes, then I/M Readiness. View Freeze Frame keeps the snapshot stored with a code.
What the reader is
The V310 is a handheld code reader, about 200 g, 155 × 85 × 25 mm. It runs from the car at DC 9–16 V. Clear a code after the fault is fixed. If the fault remains, the light can come back.
See our V310 code reader page.