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Component Identification Advise

Recommended Posts


I have a 2001 996 3.4L C2, I've only owned the car for a couple of weeks. Today the engine check light came on with no obvious symptoms. I have a very basic code reader and the fault codes were P1128 and P1130.

After a search of Google (and a moment of scaring myself silly with air oil separator story's causing catastrophic engine failure) I started to look for the cause maybe a possible vacuum leak.

There is a component on the o/s of the engine compartment suspended just above the engine. It has one hose going to it and a second hose tail that looks like it may of once had a hose on? I have attached the photo. Maybe somebody could advise me what this is and if there should be a hose attached?

I have cleared the fault codes and taken a half an hour drive, the fault had not returned although I have done nothing to rectify it.

Many thanks in advance for you help


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Many thanks for your guidance, I will investigate further

tomorrow, I know that the exhaust system is not the original. Will the vacuum valves be standard on all exhaust systems? I know the previous owner recently had the exhaust replaced.

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I'm no expert on the water cooled engines, But if you do block it off, what for error codes. A lot of newer cars post "65" the emissions control systems will port to outside air to get a reading, If you have a service manual check it for that sensor. Some times emissions codes will pop up with bad gas or a major change in the atmosphere pressure This winter has been a *****!   

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Thanks everbody for your advise, I'm very grateful.

I have blanked off the unused vacuum hose tail with a diesel injector rubber blanking plug and cleaned the MAF sensor for good measure. Done a few miles and no sign of the check light.

Ill keep the post updated if any changes occur to help anybody with a similar problem in the future. Fingers crossed though that's it fixed.

Thanks again

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