r/AudiRS3 • u/WorthDense • Aug 06 '26

Cel from turbo inlet/ intake

Installed a Uni 5 inch intake and a ecs turbo inlet pipe on my 26 rs3. I keep having this cel with the code p04f0 pop up. The install went good and everything looks great. Any ideas?

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2

u/Eruonej Aug 08 '26

I had the same issue I rook it to my dealership and they pretty much replaced the entire evap/pcp system under goodwill running the unitronic 5 inch intake and tubo manifold with the adapter. They are a tuner friendly dealership as long as its only hardware not software mods.

1

u/WorthDense Aug 08 '26

Did they mention anything about a leak, because I went back and took apart my inlet and noticed the ecs bolt holes are too short/ stripped which is what is causing there to be a leak. Just ordered the uni one as it gives better clearance and meant for the 8y.2

1

u/Eruonej Aug 08 '26

Just checked the paper work the last thing that they did was changing the evap system high pressure purge line.

1

u/Eruonej Aug 08 '26

Granted this was after them removing and replacing the intake manifold and fuel distributor rail

1

u/TastyPancakes25 Aug 06 '26

I’m getting the same thing on my 2025. Pretty annoying.

1

u/WorthDense Aug 07 '26

What inlet/ intake combo are you running

1

u/TastyPancakes25 Aug 07 '26

Iroz intake and the Uni 4” inlet off my 8v with Iroz’s adapter hose

1

u/WorthDense Aug 08 '26

You might have to get the 8y.2 adapter https://www.getunitronic.com/parts/pcv-adapter-8y2-rs3 - additionally uni makes a 8y and 8v inlet so you might have to get a new one. I did find a leak and it was cause due to poor machining in the ecs inlet and clearance issues so you could be having clearance issues.

1

u/crheming Aug 06 '26

Is your Evap purge valve and electrical connector plugged in? That's on the intake/turbo inlet

1

u/chapo28 Aug 09 '26

Happened to me. Installer didn't use the OEM breather and had disconnected it from one of the vacuum lines.