[MB-W202]

listen to khomer. he know what he's talking about. I have tried this w/o a proper sealant and leaks came back. little leaks are hard to detect and throws flags

 

[MB-W202]

That might be a non-critical vacuum line like the lines that open door locks, AC, etc. Don't know your car's lines. Follow it to investigate.

 

[MB-W202]

Yes that is a very good point.

 

[MB-W202]

That cheapo scanner won't tell you anything useful for this situation.