should i use on my lamda sensor ?

A lambda sensor on its own will draw very little current - a 5A fuse should be ample.

thank you razie

Unless it's a heated lambda sensor?

yes its heated

10A should do, put a 10 in and see if it blows, or get a spec sheet for sencor.

I'm with Rusty - try a 10 amp on the heater circuit.

10 Amps? Surely a lamba sensor is not going to draw the same as a pair of halogen headlights?

5A will easily cover lambda sensor heater cct