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Discussion Starter · #1 ·
Replaced the pump only to have it fail again in a week. Have had two do this. What am I missing? Not sure but looked like there could have been moisture in the pump after it failed? Will welcome any suggestions or help.

2004 1.8T Beetle
 

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Can you give us more about the history of the car and you were ongoing reasons for replacing your air pumps? Are you installing a new or used air pumps; what brand are they? Are you getting trouble codes and or what is the condition of the whole secondary air injection system?

Air pumps; seem to break down into these options:

genuine VW part: $400-$500+ range.
Pierburg; OEM: $300 + range.
rebuilt original oem version $200-$300 range.
cheap asian aftermarket; failure prone, poorly made, won't last: $90-$150 range.


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Discussion Starter · #4 ·
Its a cheap pump from ebay. Get incorrect airflow code. Offhand i think its p0411. First pump lasted 10 years. Seller assures me he has never had a quality issue with these pumps. Thought maybe combi valve stuck? Gonna check it soon. Dealer checked car a few weeks ago and said original pump was bad. Wanted $1000 to repair it. Can't afford that!! Car has a little over 100,000 on it. Other than pump it seems fine.

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That code doesn't necessarily mean the pump: 16795/P0411/001041 - Ross-Tech Wiki

I would start by checking all the hoses and make sure there aren't any leaks.

I just got this code on my GTI yesterday so I'll be troubleshooting it myself soon.
 

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cambi valve

make sure your cambi valve is opening up when the pump is running. If the valve is sticking closed it would cause the pump to make a weird noise sounding like a defective pump. If you have never cleaned the cambi valve since the life of the car than it's time, I'm sure it needs it bad. Remove it, cycle it with a vacuum pump, clean it, cycle it again, re-install.
 

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Discussion Starter · #10 ·
Yep, remove the airbox and it's hoses out of the way. Use a small allen ball wrench (5mm) I believe and remove the three screws from underneath and out it comes. Clean with plastic safe cleaner ...ie maf cleaner or something like that.
Pulled it and cleaned it. It was full of carbon! Not sure if valve is working or not. Didn't have a vacuum pump to pull a vacuum. Used a tube and sucked through it and it does open and close. How far should it move? Also pulled codes P0411 P1143 & P0420 are what came up. Also I was mistaken pump is working. So gotta do more research. Thanks for all the help!!!!!

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