A P0303 code in your 2020 Mercedes-Benz GLE indicates the engine control module has detected excessive misfires at cylinder 3. The first-year W167 generation offers multiple engine options. At four to five years of age, understanding wear-related causes helps ensure accurate diagnosis.
Cylinder 3 Location
Cylinder 3 position varies by engine type. Inline engines place it third from the front. V-configurations position it on one bank. Identify your engine first.
Age-Related Considerations
At approximately four to five years of service, the 2020 GLE may experience wear-related issues. Spark plugs may be approaching replacement interval. Ignition coils degrade from heat cycling. Carbon buildup affects airflow.
Common P0303 Causes
The most frequent causes include worn spark plugs, failed ignition coils, and carbon buildup. Boost leaks disrupt air-fuel mixture. Fuel system issues can affect delivery.
First-Year Generation
The 2020 model year introduced the W167 generation. Some early production refinements may have been addressed through TSBs.