Gvons, lift the lid, turn the spark knob, and see if you see a spark from the electrode next to the burner. If not, then the 'sparker' unit turned by the knob may be defective. It's less than ten bucks at your dealer.
We had spark at all three burners but the larger front burner would not light. I thought the electrode maybe wasn't close enough to the burner so tried to adjust it with needle nose pliers. I wouldn't recommend that. It doesn't adjust. And if you break the insulation like I did so that it now shorts the spark the wrong direction, then you have to either replace the entire burner or forever use a match to light that burner.
I know the cost of the sparker mechanism because our dealer ordered that part for us, thinking that's what I wanted. I've given up getting a new burner for awhile as we're leaving here Saturday and the dealer would have to order it. We'll just use a match. If I find that burner is very expensive then we'll just continue using a match.