Karlyn 30238 Mass Air Flow Sensor

BMW Mass Air Flow Sensor for Secondary Air Filter

Karlyn Bremi 30238 is a mass air flow sensor application for select BMW models with the sensor mounted at the secondary air filter. It supports accurate airflow measurement for BMW M5, BMW M6, 3 Series, X3, X5, 5 Series, and related applications listed below.

Key Features

• Mass air flow sensor for emission control systems
• Secondary air filter mounting location
• Karlyn Bremi product line
• Part number 30238 for application matching
• Direct fitment coverage for select BMW models from 2003-2010

Detailed Description

This Karlyn Bremi mass air flow sensor, part number 30238, is specified for BMW vehicles equipped with a secondary air filter sensor location. The Bremi product line identifies the specific OE-style application grouping within Karlyn’s emission control sensor catalog. Use this part when replacing a failed BMW MAF sensor on supported BMW M5, BMW M6, 325Ci, 330Ci, X3, X5, 325xi, 330i, 330xi, 525i, or 530i applications.

This part cross-references no additional part numbers in the provided data.

Vehicle Fitment

• Fits 2006-2010 BMW M5, N/A, at secondary air filter.
• Fits 2006-2010 BMW M6, N/A, at secondary air filter.
• Fits 2004-2006 BMW 325Ci, N/A, at secondary air filter.
• Fits 2004-2006 BMW 330Ci, N/A, at secondary air filter.
• Fits 2004-2006 BMW X3, N/A, at secondary air filter.
• Fits 2003-2006 BMW X5, N/A, at secondary air filter.
• Fits 2004-2005 BMW 325xi, N/A, at secondary air filter.
• Fits 2004-2005 BMW 330i, N/A, at secondary air filter.
• Fits 2004-2005 BMW 330xi, N/A, at secondary air filter.
• Fits 2004-2005 BMW 525i, N/A, at secondary air filter; E60 chassis.
• Fits 2004-2005 BMW 530i, N/A, at secondary air filter; E60 chassis.
• Fits 2003 BMW 325Ci, N/A, at secondary air filter; made on or after 3/4/2003.
• Fits 2003 BMW 325xi, N/A, at secondary air filter; made on or after 3/4/2003.
• Fits 2003 BMW 330Ci, N/A, at secondary air filter; built on or after 3-1-03.
• Fits 2003 BMW 330i, N/A, at secondary air filter; built on or after 3-1-03.
• Fits 2003 BMW 330xi, N/A, at secondary air filter; made on or after 3/4/2003.

Common Replacement Reasons

• Incorrect airflow readings from a failing BMW mass air flow sensor
• Check engine light related to air metering or sensor performance
• Rough idle or hesitation tied to inaccurate intake air measurement
• Reduced drivability on BMW M5 and BMW M6 applications
• Secondary air filter sensor replacement during intake or emission service

Installation Notes

Confirm the vehicle year, model, and sensor location before ordering. This part is listed for N/A position applications at the secondary air filter, with model-specific notes for certain BMW 3 Series and E60 chassis vehicles. Match the part number 30238 to the original sensor location and connector style before installation.

Quality Assurance

Karlyn Bremi 30238 is cataloged as an emission control sensor replacement for the confirmed BMW applications shown above. Verify fitment against the vehicle identification details and the secondary air filter mounting point before service.