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P0021Mercedes-Benz

P0021 on Mercedes-Benz— Symptoms, Causes & OEM Fix

P0021 on Mercedes-Benz vehicles (C-Class, E-Class, Sprinter, S-Class) typically indicates: Fuel and Air Metering System Malfunction (Circuit 0021). Use OEM wiring diagrams and step-by-step diagnostic procedures to isolate the fault before replacing parts.

Common Symptoms of P0021

  • • Check Engine Light (CEL) Illumination
  • • Potential decrease in fuel and air metering system efficiency
  • • Engine performanc