Pierburg 7.03635.38.0 Secondary Air Injection Pump

Pierburg Secondary Air Injection Pump

Pierburg 7.03635.38.0 is a 12V electric secondary air injection pump built as a standard replacement for emission control service. It pushes fresh air into the exhaust during cold starts to help reduce emissions and support smooth engine operation.

Brand Line: Genuine OE from HELLA identifies this Pierburg emission-control part as an OE-style replacement line focused on factory-level fit and function for Volkswagen and Audi applications.

Key Features

• Electric 12V operating mode for secondary air injection service
• Standard replacement grade for direct emission system repair
• Supports cold-start exhaust air injection to reduce emissions
• OE-level replacement from Pierburg, Genuine OE from HELLA
• Part number 7.03635.38.0 for accurate ordering and lookup

Detailed Description

This Pierburg secondary air injection pump is used in emission control systems that route fresh air into the exhaust stream after startup. That added airflow helps the engine reach cleaner cold-start operation and keeps the system working as intended. It is a direct-fit replacement for select Volkswagen Golf, Volkswagen Jetta, Volkswagen Golf SportWagen, and Audi A3 Sportback e-tron applications, with 12V electric operation specified for the listed vehicles. The part number 7.03635.38.0 is also useful when cross-checking OE replacement needs for the same application.

This part cross-references 04E 131 333 B and 04E 131 333 E for the same application.

What It Helps Fix

• Secondary air pump failure codes
• Excess emissions during cold starts
• Delayed or weak air injection operation
• Emission system warning lights related to pump performance
• Rough cold-start exhaust cleanup caused by a nonworking pump

Installation Notes and Fitment

Compatible With:

• Fits 2021 Volkswagen Golf, N/A; From 02/25/2020; Genuine OE from HELLA
• Fits 2019-2021 Volkswagen Jetta, N/A; 12V - Electric; Genuine OE from HELLA
• Fits 2019-2020 Volkswagen Golf, N/A; 12V - Electric; Genuine OE from HELLA
• Fits 2019 Volkswagen Golf SportWagen, N/A; 12V - Electric; Genuine OE from HELLA
• Fits 2016-2018 Audi A3 Sportback e-tron, N/A; 12V - Electric; Genuine OE from HELLA

Verify the OE part number, electrical connector, and vehicle build date before installation. Confirm the emission control diagnosis before replacing the pump, and inspect related hoses, valves, and wiring for damage or restriction.

Quality Assurance

Pierburg supplies OE-level emission control components, and the Genuine OE from HELLA brand line reflects factory-style replacement standards for the listed Volkswagen and Audi applications.