Got P1128/P1130 at idle.

[timqqt]

Originally Posted by Jager

Check the connections on the AOS but most likely you will need to replace the AOS . I have replaced five of them over the years on my vehicles. When you live at lower elevations, near the coast, the AOS failure rate is high. There are very few AOS failures in Colorado.

What does it mean if there is a suction when I open the oil cap?

[Jager]

Originally Posted by timqqt

What does it mean if there is a suction when I open the oil cap?

If there is a lot of suction, like a shop vac, the Air Oil Separator is bad.

[timqqt]

Originally Posted by Jager

If there is a lot of suction, like a shop vac, the Air Oil Separator is bad.

My local said it is the problem of an intake hose. Do they scam me?

[Jager]

Originally Posted by timqqt

My local said it is the problem of an intake hose. Do they scam me?

What does your local specialize in??

The diaphragm inside the AOS is cracked.

[timqqt]

Originally Posted by Jager

What does your local specialize in??

The diaphragm inside the AOS is cracked.

They specialize in volkswagen. Here's the pictures of the leaking hose they said. I am confused that these hoses are before the MAF. The air should be adjusted. Thanks for any help!

[Jager]

Tim, You might have other vacuum leaks besides the AOS. If your mechanic did a smoke test he might have found a cracked hose(s). BUT, if you have major suction at the oil fill tube the AOS is bad.

[timqqt]

Originally Posted by Jager

Tim, You might have other vacuum leaks besides the AOS. If your mechanic did a smoke test he might have found a cracked hose(s). BUT, if you have major suction at the oil fill tube the AOS is bad.

Yeah. I did see a lot of signs of AOS failure. Like, the car runs rough at idle only when it starts from cold.

I am just curious that does the fault code relates to the failed AOS or the leaking hose.

[blue62]

Originally Posted by timqqt

They specialize in volkswagen. Here's the pictures of the leaking hose they said. I am confused that these hoses are before the MAF. The air should be adjusted. Thanks for any help!

There are no hoses that enter the intake before the MAF sensor.
If there is a vacuum leak in the hoses that you are pointing to, then that air is not adjusted.
The vacuum leak in those hoses is part of your problem.