Thread: Auxiliary air pump
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Old Apr 30, 2015 | 08:58 AM
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onehundred80
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From: Ontario
Default Re: Auxiliary air pump
Originally Posted by gedwar1
The Mercedes part number 580 000 021 (Mercedes) is the same bosh pump as part number 580 000 023 (Audi). Even the number stamped on the plastic is the same. You should be able to find a new Audi pump for around $200 by doing an online search by part number. After my first pump failed (burned up) the new pump stayed on too long, so I unplugged it before it fried also. I pulled out the relay box and found the relay for the pump stuck closed. I replaced the relay and no more problems.
These parts have different part numbers for a reason, they may look the same and they may actually work just fine but to say it is the same pump is not true. Probably one is to Mercedes specifications and the other to Audi specifications. If they were identical they would have the same Bosch part number.
A large company like Bosch does not keep identical parts on the shelf with two different numbers.
 
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