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Pierburg 7.21851.31.0 Secondary Air Injection Pump
| Brand | Pierburg 7.21851.31.0 |
|---|---|
| Operating Mode | Electric |
| Technical Information Number | SI 1150-11 |
| Voltage [V] | 12 |
| Fits | Audi and Volkswagen · 63 vehicles |
Electric operation. Provides consistent secondary air injection performance.
12-volt design. Matches standard automotive electrical systems.
Secondary air injection pump. Supports the emission control system.
Cross-references Anchor 9608, URO 078906601M and VEMO V10-63-0070 for the same application. See all 5.
Pierburg Secondary Air Injection Pump
The Pierburg 7.21851.31.0 is an electric secondary air injection pump for emission control systems on select Audi and Volkswagen models. It supplies fresh air during cold-start operation to help the engine management system reduce exhaust emissions and reach proper catalyst function more quickly.
- Electric secondary air injection pump for 12V systems
- OE-style emission control replacement for select Audi TT, A4, A6, S6, and Volkswagen Golf, Jetta, Beetle, Cabrio, and Passat applications
- Built to match OE reference numbers including 078906601M and 06A959253 where listed
- Technical Information Number: SI 1150-11
- Brand: Pierburg
Fitment and Application Details
Compatible With select 1996-2009 Audi and Volkswagen vehicles. Fits 2008-2009 Volkswagen Jetta, N/A; Fits 2001-2006 Audi TT, N/A; Fits 2003-2006 Audi TT Quattro, N/A; Fits 2000-2006 Volkswagen Golf, N/A; Fits 2002-2005 Volkswagen Beetle, N/A; Fits 2000-2005 Volkswagen Jetta, N/A; Fits 2002-2004 Audi A6 Quattro, N/A; Fits 2002-2003 Audi S6, N/A; Fits 2001-2002 Audi TT Quattro, N/A; Fits 2000-2001 Audi A6 Quattro, N/A; Fits 1998-2001 Volkswagen Beetle, N/A; Fits 1996-2000 Audi A4, N/A; Fits 2000 Audi A4 Quattro, N/A; Fits 2000 Audi A6, N/A; Fits 2000 Volkswagen Cabrio, N/A; Fits 2000 Volkswagen Passat, N/A; Fits 1996-1999 Audi A4 Quattro, N/A; Fits 1999 Volkswagen Golf, N/A; Fits 1999 Volkswagen Jetta, N/A.
This part cross-references URO (e.g., 078906601M) and VEMO (e.g., V10-63-0070) for the same application.
What This Pump Helps Address
- Secondary air injection fault codes related to insufficient air delivery
- Cold-start emissions issues on Audi and Volkswagen engines
- Check engine lights tied to the secondary air system
- Reduced catalyst warm-up performance after startup
- Noise or failure from a worn electric air pump
Installation Notes and Tips
Verify the OE number on the original pump before ordering, especially on vehicles with VIN breakpoints or OE-number-specific fitment notes. Confirm the vehicle uses a 12V electric secondary air injection pump and compare the connector, mounting, and system layout to the removed unit. After installation, clear stored fault codes and confirm the secondary air system operates correctly during cold-start testing.
Quality Assurance
Pierburg is an established OE supplier in emission control components, and this pump is referenced to factory-style part numbers for the listed applications. Use the OE cross-reference and fitment notes to confirm the correct application for your Audi or Volkswagen model before installation.
| Year | Make | Model | Body Type | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 2009 | Volkswagen | Jetta | — | 2.0L | L4 | GAS | N/A | To VIN # X999999 |
| 2008 | Volkswagen | Jetta | — | 2.0L | L4 | GAS | N/A | To VIN # X999999 |
| 2006 | Audi | TT | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2006 | Audi | TT Quattro | — | 1.8L | L4 | — | N/A | — |
| 2006 | Volkswagen | Golf | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2005 | Audi | TT | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2005 | Audi | TT Quattro | — | 1.8L | L4 | — | N/A | — |
| 2005 | Volkswagen | Beetle | — | 2.0L | L4 | — | N/A | To VIN # X499000 |
| 2005 | Volkswagen | Golf | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2005 | Volkswagen | Jetta | Wagon | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2005 | Volkswagen | Jetta | Sedan | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2004 | Audi | A6 Quattro | — | 4.2L | V8 | — | N/A | — |
| 2004 | Audi | TT | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2004 | Audi | TT Quattro | — | 1.8L | L4 | — | N/A | — |
| 2004 | Volkswagen | Beetle | — | 2.0L | L4 | — | N/A | To VIN # X499000 |
| 2004 | Volkswagen | Golf | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2004 | Volkswagen | Jetta | Wagon | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2004 | Volkswagen | Jetta | Sedan | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2003 | Audi | A6 Quattro | — | 4.2L | V8 | — | N/A | — |
| 2003 | Audi | S6 | — | 4.2L | V8 | — | N/A | — |
| 2003 | Audi | TT | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2003 | Audi | TT Quattro | — | 1.8L | L4 | — | N/A | — |
| 2003 | Volkswagen | Beetle | — | 2.0L | L4 | — | N/A | To VIN # X499000 |
| 2003 | Volkswagen | Golf | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2003 | Volkswagen | Jetta | Wagon | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2003 | Volkswagen | Jetta | Sedan | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2002 | Audi | A6 Quattro | — | 4.2L | V8 | — | N/A | — |
| 2002 | Audi | S6 | — | 4.2L | V8 | — | N/A | — |
| 2002 | Audi | TT | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2002 | Audi | TT Quattro | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2002 | Volkswagen | Beetle | — | 1.8L | L4 | — | N/A | To VIN # X499000 |
| 2002 | Volkswagen | Golf | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2002 | Volkswagen | Jetta | Wagon | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2002 | Volkswagen | Jetta | Sedan | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2001 | Audi | A6 Quattro | — | 4.2L | V8 | — | N/A | with OE No. 078906601M |
| 2001 | Audi | TT | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2001 | Audi | TT Quattro | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2001 | Volkswagen | Beetle | — | 1.8L | L4 | — | N/A | with OE No. 06A959253 |
| 2001 | Volkswagen | Golf | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2001 | Volkswagen | Jetta | Sedan | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2000 | Audi | A4 | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 2000 | Audi | A4 Quattro | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 2000 | Audi | A6 | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 2000 | Audi | A6 Quattro | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 2000 | Volkswagen | Beetle | — | 1.8L | L4 | — | N/A | with OE No. 06A959253 |
| 2000 | Volkswagen | Cabrio | — | 2.0L | L4 | — | N/A | with OE No. 06A959253 |
| 2000 | Volkswagen | Golf | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2000 | Volkswagen | Jetta | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 2000 | Volkswagen | Passat | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 2000 | Volkswagen | Passat | — | 1.8L | L4 | — | N/A | with OE No. 078906601M |
| 1999 | Audi | A4 | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 1999 | Audi | A4 Quattro | — | 2.8L | V6 | — | N/A | with OE No. 078906601D |
| 1999 | Volkswagen | Beetle | — | 2.0L | L4 | — | N/A | with OE No. 06A959253 |
| 1999 | Volkswagen | Beetle | — | 1.8L | L4 | — | N/A | with OE No. 06A959253 |
| 1999 | Volkswagen | Golf | — | 2.0L | L4 | — | N/A | with OE No. 06A959253 |
| 1999 | Volkswagen | Jetta | — | 2.0L | L4 | — | N/A | with OE No. 06A959253 |
| 1998 | Audi | A4 | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 1998 | Audi | A4 Quattro | — | 2.8L | V6 | — | N/A | with OE No. 078906601D |
| 1998 | Volkswagen | Beetle | — | 2.0L | L4 | — | N/A | with OE No. 06A959253 |
| 1997 | Audi | A4 | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 1997 | Audi | A4 Quattro | — | 2.8L | V6 | — | N/A | with OE No. 078906601D |
| 1996 | Audi | A4 | — | 2.8L | V6 | — | N/A | with OE No. 078906601M |
| 1996 | Audi | A4 Quattro | — | 2.8L | V6 | — | N/A | with OE No. 078906601D |
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