Hyundai Elantra Forum banner
1 - 1 of 1 Posts

· Registered
1,579 Posts
i know a lot of people have said that a bad o2 sensor can lead to the low mpg and not throw a code. I've dropped mpg but gonna wait till after winter and see if it improves.

Basic list for mpg: driver lead foot, spark plugs/wires, fuel quality, 02 sensor, tires
1 - 1 of 1 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.