Why Does the Hyundai Santro’s Fuel Efficiency Along with Higher Emissions?

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Why Does the Hyundai Santro’s Fuel Efficiency Along with Higher Emissions?

Owners often report reduced fuel efficiency accompanied by increased smoke o r odor from the exhaust. How do issues such as clogged air filters, faulty oxygen sensors, o r poor maintenance contribute to higher emissions and reduced fuel economy?

Talha Kyanii asked on 03 Dec 2025 17:14:04 pm

1 Answer

17 views |

Gari Master - on 03 Dec 2025 17:16:16 pm

Reduced fuel efficiency and increased emissions usually go hand-in-hand due to improper combustion.

Common Causes

Clogged air filter o r dirty throttle body:
Reduces airflow, causing a rich mixture and more fuel consumption.

Faulty oxygen O2 o r MAP sensor:
Sends wrong data to ECU, increasing fuel use and emissions.

Poor engine tuning o r worn fuel injectors:
Causes uneven fuel spray and incomplete burning.

Low-quality fuel:
Petrol o r CNG with impurities leads to carbon buildup and poor efficiency.

Delayed maintenance:
Old spark plugs, dirty fuel lines, and clogged catalytic converters worsen fuel efficiency.

Solutions

Clean o r replace air filter and throttle body.

Inspect and replace sensors as needed.

Service fuel injectors and use good quality fuel.

Replace old spark plugs.

Check catalytic converter health.