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Pierburg 7.21851.31.0 Secondary Air Injection Pump

(Volkswagen Jetta 1999-2000, 2002-05, 2008-09, Beetle 1998-2005, Passat 2000, Golf 1999-2006, Cabrio 2000; Audi A4 Quattro 1996-2000 + 6 more models)

Manufacturer

Picture for manufacturer Pierburg

Part Number

7.21851.31.0
9 reviews
Sale Price

$346.43

In Stock (10)

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Product Details

The Pierburg 7.21851.31.0 is an OEM-quality electric secondary air injection pump designed to reduce harmful emissions during cold start conditions. This 12-volt electrically-operated pump is a direct replacement for OEM part numbers 06A959253, 078906601D, and 078906601M, commonly used in Audi, Volkswagen, SEAT, and Skoda vehicles.

Key Features:

  • Electric operation with 12V power supply
  • OEM manufacturer quality from Pierburg
  • Designed to inject fresh air into the exhaust stream during cold starts
  • Reduces hydrocarbon (HC) and carbon monoxide (CO) emissions by up to 90%
  • Helps catalytic converter reach operating temperature faster
  • Operates for approximately 60-90 seconds during cold start phase
  • Integrated filtration system protects internal components

How It Works:

The secondary air injection pump activates during cold engine starts when the catalytic converter has not yet reached its optimal operating temperature of 300-350°C. The pump injects oxygen-rich ambient air into the exhaust manifold, promoting more complete combustion of unburned fuel and partially burned hydrocarbons. This process significantly reduces tailpipe emissions during the critical cold start phase when up to 80% of a vehicle's total emissions are produced.

OEM Cross-Reference Numbers:

  • Audi: 06A959253, 078906601D, 078906601M
  • VW: 06A959253, 078906601D, 078906601M
  • SEAT: 06A959253, 078906601D, 078906601M
  • Skoda: 06A959253, 078906601D, 078906601M

Pierburg has been a trusted OE supplier to major automotive manufacturers since 1909, specializing in emissions control systems, electric pumps, and exhaust gas recirculation components. This secondary air pump represents decades of engineering expertise in emissions reduction technology.

Products specifications

Fits

Volkswagen Jetta 1999-2000, 2002-05, 2008-09, Beetle 1998-2005, Passat 2000, Golf 1999-2006, Cabrio 2000; Audi A4 Quattro 1996-2000, A6 Quattro 2000-04, TT Quattro 2001-06, A4 1996-2000, A6 2000, TT 2001-06, S6 2002-03

Had exactly what I needed!

THANKS FOR MY ORDER

GREAT PRICE & SERVICE

Good so far. Will see on shipping and part. Thanks

They had the lowest price on the web and carried the part I needed. They used amazon. Heck out so it was super easy to place the order and the part shipped right away. Will definitely order from again.

Had a coupon for 25% off shipping, only took off 21%.and would not let me also use my 2% off total coupon.

Good

Easy to place my order and find the right parts that fit my vehicle.

Ordered some special Axles which required Factory shipping. Order was processed efficiently, and axles were shipped from factory in 2 work days. Excellent service, good followup on the order. Definitely a good source for parts.

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