Bavarian Restoration offers Air Flow Meter service
​ for all Bosch and Denso brand AFM's

Bavarian Restoration refurbishes all Bosch Air Flow Meters to meet factory specifications. Let me tell you that this is one of the most important sensors for your engine. After 10 or so years, these units really start to send your ECM poor and inaccurate feedback. The AFM has two sensors in one unit:
  • An Air Inlet Temperature sensor, which provides feedback to the ECM for incoming air temperature.
  • A potentiometer which provides the ECM feedback voltage that is linear with respect to the opening of the internal flap. Non-linear for older sensors and ETA BMW's.
After many years of use, the inaccurate feedback will affect economy, poor running, poor idle, symptoms of misfire, and loss of power.
Bavarian Restoration Refurbishes Air Flow Meters using the following process:
  1. AFM is heat tank soaked, ultra sonic cleaned, bead blasted clean, and clear coat painted.
  2. Test intake air temperature sensor resistance over the heat range specified by Bosch.
  3. Test AFM door spring tension and adjust accordingly to known Bosch specs.
  4. Disassemble wiper arm and connector assembly. Clean incoming, and outgoing contacts and bend them to contact fresh material. Clean wiper arm contacts and primary grounding post. Adjust wiper arm to contact fresh material.
  5. Reassemble wiper arm and connector. (all contacts touch fresh new material only!)
  6. All mechanical pivot points are lubricated with liquid Teflon.
  7. Measure voltage signal output with oscilloscope and adjust if necessary. We run a variety of tests including quality repeatability, linearity testing (or non linear for eta AFM's,) quality repeatability in the idle genre and the fully open genre. Every AFM is thoroughly tested over a variety of conditions.
  8. Lid is sealed with silicone to ensure a moisture and water proof AFM.
  9. Every successfully refurbished AFM will receive a quality control decal. 

All available AFM units are listed at our online store.

​To send in your AFM for service, please review the following:

  • AFM service is started in batches, typically 30-45 day lead time. 
  • To send your AFM in for service, contact us via email.  Info@BavRest.com
  • In your email including how many AFM units you are sending in, current condition of your AFM, your location for calculating return shipping, and your Paypal email account so we can send you an invoice for payment. If you do not have Paypal, that is OK. We can send an invoice to any email address, Paypal will just handle payment, no account needed.​
  • For those who require expedited service.  Please email us for a quote. 

Some examples of our refinished refurbished Air Flow Meters