Why is my Mercedes E-Class consuming more fuel than usual even with regular maintenance?

Home > Gari Forums > Mercedes Benz Forums > Mercedes Benz E Class Forums > Mercedes Benz E Class Performance Forums

Why is my Mercedes E-Class consuming more fuel than usual even with regular maintenance?

My E-Class W211 used to give decent mileage, but recently I’ve seen a noticeable in fuel efficiency. I get it serviced regularly and use high-octane fuel, but the average is still poor. Could it be due to faulty sensors like the O2 o r MAF sensor, tire pressure issues, o r driving habits? What are common fuel consumption problems in Pakistan?

Talha Kyanii asked on 11 Oct 2025 11:43:06 am

1 Answer

8 views |

Gari Master - on 11 Oct 2025 11:43:53 am

Poor fuel economy in E-Class cars is often reported in Pakistan due to a combination of mechanical and environmental reasons:

Possible causes:

Faulty oxygen sensor o r MAF sensor: Leads to incorrect air-fuel mixture, increasing fuel use.

Under-inflated tires: Increases rolling resistance.

Dirty air filter o r spark plugs: Reduces combustion efficiency.

Bad fuel quality o r mixing of low-grade petrol: Common in some areas of Pakistan.

Short trips and heavy traffic: Don’t allow the engine to reach optimal temperature o r efficiency.

What to do:

Scan the car for sensor faults and replace any failing O2 o r MAF sensors.

Keep tires inflated to the recommended pressure.

Replace air filter and spark plugs if worn.

Use high-quality fuel and avoid mixed o r diluted fuel pumps.

Avoid excessive idling and plan routes to reduce stop-and-go driving.