Oil Separator Bellows Hose

loub · 02-07-2007, 12:47 PM

I'm still getting P1128 & P1130 codes after changing my O2 sensors, spark plugs, fuel filter and cleaning the MAF sensor since the car has 68,000 miles anyway and there was oil residue on the passenger side O2 sensor closest to the engine so I figured I must have an air leak at the Bellows hose. This hose is not shown in my Bentley Manual. How many Bellows hoses are there and is it difficult to replace it (or them)? Anyone have a picture or diagram of the hose(s). Anything else I should replace while doing the hose(s)?
Thanks,

Britwrench · 02-07-2007, 08:58 PM

At 68K miles I would replace the oil seperator AND the bellows hose.
You will also need the update breather hose too. The hose comes with the seperator.

Check if the original oil filler hose is still there, if it is, replace that too.

loub · 02-08-2007, 06:41 AM

Is the bellows hose the same thing as the vent line for oil seperator? I couldn't find an "update breather hose" - where does it go and what does it do? If I understand your response correctly, you are suggesting that I replace both oil seperators and both vent lines for oil seperator (bellows hose), as well as the update breather hose. Do you know anywhere that I can see a diagram of those parts?

Thanks,

Britwrench · 02-08-2007, 05:56 PM

The Porsche parts CD is available from Pelican.

The updated oil seperator looks like the old one. The breather hose goes from the top of the seperator to the intake manifold.

There is only one oil seperator and breather hose that needs changing.

You also need to run the vehicle on a Porsche tester to ensure all the values are correct and you are not "changing parts" in the hope of fixing a problem.

loub · 02-08-2007, 07:16 PM

I got access to the parts diagrams off of a porsche technical website. It shows the "vent line" going from the top of the oil separator to the intake manifold and a "breather hose" going from the bottom of the oil separator to ... Should I replace this breather hose and what does it connect to? Should I replace the bellows and what does it connect to, if anything?
Thanks,

Britwrench · 02-09-2007, 06:30 PM

The updated seperator has a longer breather hose, the old one (the one on your car) won't fit.

If the bellows is leaking it allows extra air into the engine and breather system, upsetting the programmed parameters, allowing the check engine light to come on. 60k miles onwards, it's fairly common.

The oil fill hose does the same thing if it's leaking (and they do).

That's why you need to run the engine on a Porsche tester and see what the adaption system is doing. If the computer is trying to keep the engine running (due to an air leak) the numbers will be wrong.