After replacing MAF fuel mileage has gone down

JEREMY093

MEMBER
2015 NISSAN VERSA
0.6L
AUTOMATIC
105,089 MILES

Hi. Yesterday I had my mass air flow sensor changed. I had error code p0101 for my diagnostic machine. I noticed during my issue was was burning gas so fast. Well today (day after part was replaced) it’s still kind of burning fast. Is there a timeframe to where the part reprograms or could it be another problem? Help please.

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

Has the check engine light stayed off? Also, are there any odors from the vehicle that could indicate it is running too rich on fuel? Does the engine idle and run properly? Is the air filter clean and not plugged?

As far as poor fuel mileage, how bad is it?

Let me know.
Joe

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Tuesday, December 8th, 2020 AT 1:43 PM

JEREMY093

MEMBER
3 POSTS

Hi. No, there isn’t any smells. The engine light is off. When I’m parked is does rumble a little bit. The air filter was changed last month with my oil change.

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Tuesday, December 8th, 2020 AT 1:58 PM

JEREMY093

MEMBER
3 POSTS

It the gas mileage also jumps. Like today it went from 140 to 137 to 135 back to 137 now it’s at 127 and I didn’t drive much. (Miles until empty)

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Tuesday, December 8th, 2020 AT 2:02 PM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

Is it possible for you to get your hands on a live data scan tool? If possible, let me know what the short term fuel trims are. That will tell me if there is a fuel issue going on. Also, it may not be a bad idea to check for engine vacuum leaks. They can cause a rough idle and drivability issues.

Here is a link that shows how to find a leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let me know.

Joe

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Tuesday, December 8th, 2020 AT 5:58 PM