Toyota Corolla Poor Fuel Economy – What Could Be the Cause?

Hey there!

It’s frustrating when fuel economy suddenly s without any noticeable change in driving habits. Since you’ve already checked tire pressure and replaced the air filter, here are a few other things that might be causing the issue:

Spark Plugs – Worn-out o r dirty spark plugs can lead to inefficient combustion, causing the engine to use more fuel. If they havent been replaced recently, its worth checking them to ensure theyre in good condition.

Fuel Injectors – Clogged o r dirty fuel injectors can also cause poor fuel economy by disrupting the proper air-fuel mixture. Using a fuel injector cleaner o r getting them professionally cleaned could help.

Oxygen Sensors – A faulty oxygen sensor can trick the engines computer into using more fuel than necessary. This is a common cause of reduced fuel efficiency and can often go unnoticed until a diagnostic check reveals it.

Fuel Pressure Regulator – If the fuel pressure regulator is malfunctioning, it could cause fuel to be injected into the engine at the wrong pressure, leading to poor fuel economy.

Dirty Mass Airflow MAF Sensor – A dirty MAF sensor can cause the engine to receive incorrect readings about the air coming in, affecting fuel consumption. Cleaning the sensor might help improve efficiency.

Worn-out Tires – Even though you’ve checked the pressure, make sure your tires are in good shape. Tires that are worn unevenly o r have low tread can reduce fuel efficiency.

Driving Conditions – Short trips with lots of stop-and-go driving can cause lower fuel economy, even if your driving habits haven’t changed. If youve noticed more of this recently, it could explain the .

If none of these seem to be the issue, I’d recommend running a diagnostic scan to check for any hidden trouble codes. Hope this helps, and let us know what you find!