I found malfunction indicator light in yellow.. My car I used, below 90000KM, with care.

I am troubling to start engine after got this alert.

I drive my car to Nissan service center, they advise me to bring back if repeat of problem after they make some computer test and reset something. I got the same problem on next day, same time.. I drive again to Nissan service center. Now they advise me to replace crankshaft and camshaft sensors and it will coast around $300.

My Question...

Why it happening like this?

ashifcherumoth@gmail.com