This is the second time this happened.

I noticed the front driver side tire was pretty deflated and went to put air in it. I asked the guy to check the tire for punctures and we found a nail near the inner sidewall. He said he will plug it up but it may be dangerous to drive. I know if it's the sidewall I need to replace but anyone have any thoughts on this?

Also, the low tire pressure warning did not pop up even though there was noticeable air gone.

Thanks in advance.

Generally , sidewall plugs are not recommend for tire plugs , since the top and sidewall make a lot of movement, where they meet . And mostly work its way free or start separating the belt.