Check valve

[Aok303]

Is out check valve a sealed piece or a snap together? Seems mine has come apart or unsnaps

[Terry.Reese]

Which check valve?

[JS4Avant]

Do you mean the Crank case vent? If so yea they come apart, should snap back in


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[Aok303]

https://jhmotorsports.com/shop/catal...-s4-p-396.html

[924Carrera]

It's sealed. I just replaced mine, which helped with rough idle. Mine was rattling and the new one doesn't. Also, you can get the OEM brand for like $20.

[Terry.Reese]

ahh, yeah just replaced mine also, I also rubbed some high temp bondo around the top edge and let set. now it is extra safe.

[Aok303]

if mine is faulty could it cause these two codes

17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 002 - System too Rich - MIL ON
Freeze Frame:
Fault Status: 11100010
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 194089 km
Time Indication: 0

Freeze Frame:
RPM: 3345 /min
Load: 13.7 %
Speed: 107.0 km/h
Temperature: 96.0°C
Temperature: 45.0°C
Absolute Pres.: 820.0 mbar
Voltage: 13.462 V

17537 - Fuel Trim; Bank 2 (Mult)
P1129 - 002 - System too Rich - MIL ON
Freeze Frame:
Fault Status: 11100010
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 194090 km
Time Indication: 0

Freeze Frame:
RPM: 3198 /min
Load: 27.8 %
Speed: 102.0 km/h
Temperature: 96.0°C
Temperature: 45.0°C
Absolute Pres.: 820.0 mbar
Voltage: 13.335 V

i have replaced an o2 already cleaned my MAF and purge i was looking for loose tubes when i found the check valve issue

[924Carrera]

I find it really unlikely that the check valve would be the cause of that.

[Aok303]

Any idea what could be the code issues im kinda stumped

[2004B6S4]

I just replaced mine also. Apparently there was an update to that part as the older one was prone to coming apart, I wasn't able to find much about it in relation to the s4 but that's what I read in the a4 forum. Seems that either it comes apart more often for them or maybe the slight vac leak just gets noticed more since they're boosted. It will cause a vacuum leak but if I'm not mistaken that would be more likely to cause a lean condition, so there must be something else causing the rich codes.

[Aok303]

yeah im a lil stumped someone said i its a leak, or spark plugs or still my MAF im gonna start by the valve check the check my plugs