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GLS Class (X166) Produced from 2016 to 2019

Left air filter case - some sort of pressure valve?

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Old Jun 21, 2025 | 05:38 PM
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Chris0212
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2019 GLS550
Left air filter case - some sort of pressure valve?
I’m trying to figure out what this part is so I can order a replacement. The plastic is brittle and part of the male component that goes into the left air filter case broke off.

Unknown component on 2019 GLS 55 m278 engine
Unknown component on 2019 GLS 55 m278 engine
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Old Jun 22, 2025 | 12:54 PM
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2013 GL350
I can’t comment on its accuracy but chat identifies it asturbocharger wastegate actuator

✅ Here’s what it does:
  • The M278 is a 4.7L twin-turbocharged V8.
  • Each turbo has a wastegate to regulate exhaust pressure and control boost.
  • The actuator (highlighted in your image) is a small servo or vacuum-powered unit that opens/closes the wastegate based on signals from the ECU.
  • Its job is to prevent overboost and help the turbo operate efficiently across engine speeds

maybe that’s a start
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Old Jun 22, 2025 | 04:01 PM
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'17 GLS450, '14 GLK250, Grandpa's Roadster
I don't know how you could expect anyone to answer from that picture. Only a bot would even try...
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Old Jun 22, 2025 | 07:17 PM
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2019 GLS550
Originally Posted by John CC
I don't know how you could expect anyone to answer from that picture. Only a bot would even try...
thanks for the complaint. I’ll upload a higher resolution image when I’m out of the hospital. I was trying to not upload a large file size.
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