I am getting horrible fuel mileage on a 2002 Ford F150 5.4. Could it be the o2 sensors going bad. no light in on

Richard Johnson

Asked by Mar 12, 2014 at 06:41 PM about the 2002 Ford F-150 XLT Crew Cab SB

Question type: Maintenance & Repair

just started getting bad fuel mileage. the last tank was 13.3 mpg. the tank before that was 14.6. I use cruise when possible and keep the rpm's below 2000. KLM air filter is clean, tires are at 33 psi. Could it be the O2 sensor going bad. I don't have any light on.

9 Answers

Tom Demyan

KLM filter or a K&N? If it's a K&N, I've heard of people over oiling their filters contaminating the MAF elements causing a decrease in performance and MPG. Purchase some CRC MAF cleaner and clean the MAF. Go to www.youtube.com to see how it is done. Bad O2 would throw a code and your CEL would be on.

Best Answer
Richard Johnson

It is a K&N filter.

1 out of 1 people think this is helpful.
Richard Johnson

Tom I cleaned the MAF elements. And now checking a new tank of fuel. I will post an update when I get the data. Thanks I sure hope this helps

Tracy Hooks

Bad gas mileage? That's about right. What do you consider good gas mileage for a big V8? The fuel mileage rating is only 12 to 15 MPG.

Richard Johnson

Tracy. That is your opinion. I know I should be getting over 15mpg. You have a right to your opinion.

Tracy Hooks

That is not my opinion. It is a fact. As a Master Certified Ford Technician and an ASE Certified Master Automotive Technician I can say that your expectations not only exceed your grasp but reality as well. Want mileage? Buy a small car.

Andrew Olsen

http://www.fueleconomy.gov/feg/bymodel/2002_Ford_ F150_Pickup.shtml Tracy is right. Your mpg's are what they should be. 11- 15 is the rating for the 5.4l. If you want better mileage you need a different truck. Its not opinion, lol. You cant make a truck get better mpg's by simply thinking is should.

1 out of 1 people think this is helpful.
Richard Johnson

Tom I just filled up my truck and on this tank, it was 14.98 mpg. I am happier but I have a few more things to do. I will update you with the results. Thanks again

1 out of 1 people think this is helpful.

Do you have big tires or drive really fast or do a lot of city driving? My 2002 F150 4x4 with stock tires would get 18 on the highway cruising at 75. I love my K&N air filter. Since I installed it my engine oil stays a lot cleaner! The EPA highway mileage for the 2002 Ford F150 with the 5.4 engine is 17.

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