Are you sure it isn't dirt on the sensor?
1	Are	be	AUX	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	3	cop	3:cop	_
2	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	3	nsubj	3:nsubj	_
3	sure	sure	ADJ	JJ	Degree=Pos	0	root	0:root	_
4	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	7	nsubj	7:nsubj	_
5-6	isn't	_	_	_	_	_	_	_	_
5	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	cop	7:cop	_
6	n't	not	PART	RB	_	7	advmod	7:advmod	_
7	dirt	dirt	NOUN	NN	Number=Sing	3	ccomp	3:ccomp	_
8	on	on	ADP	IN	_	10	case	10:case	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	10:det	_
10	sensor	sensor	NOUN	NN	Number=Sing	7	nmod	7:nmod:on	SpaceAfter=No
11	?	?	PUNCT	.	_	3	punct	3:punct	_
