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Mercedes C-Class W203 M271 Lambda Sensor | FAE 75021
Mercedes C-Class W203 M271 Lambda Sensor | FAE 75021

Mercedes C-Class W203 M271 Lambda Sensor | FAE 75021

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OEM:0025401817003542731825401817420349A0025401817
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Mercedes W203 M271 Lambda Sensor

FAE 75021 | Pre-Catalytic | Precise Mixture Control

The FAE (75021) oxygen sensor developed for Mercedes-Benz W203 (M271 Engine) vehicles maintains exhaust emission values at an ideal level, providing fuel savings and optimizing engine performance.

  • Fast Response Time: Detects changes in engine operating conditions within milliseconds and transmits to the ECU.
  • Fuel Savings: Minimizes fuel consumption by preventing unnecessary rich mixtures and protects the catalyst.
  • Heat-Resistant Body: Special stainless structure resistant to high temperatures and corrosion in the exhaust line.
  • Plug-and-Play Socket: Easy installation with 100% compatibility using original cable length and Mercedes socket design.

Technical Details

Brand FAE (Spain)
Product Code 75021
Possible OEM Reference 001 540 50 17 / 002 540 01 17
Position Pre-Catalytic (Regulation Sensor)
Compatible Engine M271.940 / M271.946 (Compressor)

Expert Recommendation

Why FAE? Signal quality is vital in lambda sensors. FAE is one of the European brands that meets Mercedes-Benz's signal ranges with the highest precision.
Installation and Maintenance Tip: When installing the sensor, ensure that the high-temperature resistant grease (anti-seize) does not come into contact with the sensor head. Clearing old error codes from the engine brain (ECU) and resetting mixture values after replacement ensures optimal performance.
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