My 2009 2.4 2AZ-FE Camry got horrible gas mileage! - Toyota Nation Forum : Toyota Car and Truck Forums
Camry 5th & 6th Gen (2002-2006 & 2007-2011)/2nd Gen Solara (2004-2008) Toyota Camry Discussion for years 2002-2006 & 2007-2011, as well as Solara Discussion for years 2004-2008. Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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post #1 of 41 Old 06-19-2019, 07:09 AM Thread Starter
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My 2009 2.4 2AZ-FE Camry got horrible gas mileage!

Hi all,

Just got this 2009 Camry with 2.4 2AZ-FE engine, 5 speed auto and about 60K miles on it. It is getting about 14MPG. Although I drive mostly in the city, about 80% City, 20% highway, 14MPG (6KM / Liter) is not normal.

Everything works, I changed the engine with 5W-30 full synthetic, changed the transmission oil, and still pink. Also 4 brand new tires with 36 psi.

I haven't cleaned the MFA sensor yet, this is what I'm going to do next. I'm wondering if my O2 sensor is bad? There are 2 sensors, one in front of the engine which I can do it myself, another under the car which I'll need to go to a shop to do it for me.

P.S. I don't have check engine light on. And check engine light does work ( not blacken out by previous owner).



Many thanks!
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post #2 of 41 Old 06-19-2019, 07:24 AM
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Originally Posted by TwinCam2 View Post
Hi all,



Just got this 2009 Camry with 2.4 2AZ-FE engine, 5 speed auto and about 60K miles on it. It is getting about 14MPG. Although I drive mostly in the city, about 80% City, 20% highway, 14MPG (6KM / Liter) is not normal.



Everything works, I changed the engine with 5W-30 full synthetic, changed the transmission oil, and still pink. Also 4 brand new tires with 36 psi.



I haven't cleaned the MFA sensor yet, this is what I'm going to do next. I'm wondering if my O2 sensor is bad? There are 2 sensors, one in front of the engine which I can do it myself, another under the car which I'll need to go to a shop to do it for me.



P.S. I don't have check engine light on. And check engine light does work ( not blacken out by previous owner).







Many thanks!


I thought the 2009 camrys took either 0w-20 or 5w-20?


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post #3 of 41 Old 06-19-2019, 08:20 AM Thread Starter
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Yes, I'd use 0W-20 next time, but using 5W-30 shouldn't give me such horrible gas mileage.

I used 30 weight because I thought it would give the engine a bit more protection. Definitely will change it to the correct 0W-20 next time.
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post #4 of 41 Old 06-19-2019, 08:23 AM Thread Starter
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I went to a shop that has OBD II scanner, they didn't have one that read the Air-fuel ratio, but there are no code that says o2 sensors are bad. No check engine light. They gave me a suggestion, only a guess.
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post #5 of 41 Old 06-19-2019, 09:25 AM
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Throw in some fuel cleaner.

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post #6 of 41 Old 06-19-2019, 09:28 AM Thread Starter
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Throw in some fuel cleaner.
I did. Twice.
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post #7 of 41 Old 06-19-2019, 09:37 AM
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Originally Posted by TwinCam2 View Post
I did. Twice.
You could change the 02 sensors to see if that changes anything or even unhook the battery for a bit and allow for the ECU to reset. Can't say if those will help. I've noticed a slight decline in mpg but at the same time not so much. Apparently the tune might've helped me but I never kept track of previous mpg.

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post #8 of 41 Old 06-19-2019, 09:55 AM Thread Starter
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Originally Posted by Vangm25 View Post
You could change the 02 sensors to see if that changes anything or even unhook the battery for a bit and allow for the ECU to reset. Can't say if those will help. I've noticed a slight decline in mpg but at the same time not so much. Apparently the tune might've helped me but I never kept track of previous mpg.
Thanks. What is your current mileage?
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post #9 of 41 Old 06-19-2019, 09:59 AM
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Thanks. What is your current mileage?
Less than 101,000 miles.

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post #10 of 41 Old 06-19-2019, 11:58 AM Thread Starter
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Originally Posted by Vangm25 View Post
Less than 101,000 miles.
Sorry, I meant your gas mileage. What is your MPG?
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post #11 of 41 Old 06-19-2019, 01:14 PM
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Sorry, I meant your gas mileage. What is your MPG?
Generally speaking, what I've noticed when I fuel from E (gas light) to full TRIP B is at maybe 360 miles or less but it's not something I kept track of. I've got a tune that uses 91 octane and mpg it seems to have increased by a little bit.

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post #12 of 41 Old 06-19-2019, 03:37 PM
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Welcome TwinCam2!


First off, the engine was designed for 5-30 so using it is perfectly fine and will not impact the mpg (0-20/5-20 is a nod to CAFE standards). 14 mpg is not normal , not even close. Can you give us a run down of when it was performing normally and if anything changed?


I am pretty sure my A/F sensor (O2) is going, as I will get running rich codes time to time and when I do my mpg drops down to 23 or so. Normally I get around 28 with mostly highway miles. But I do nave a new rebuilt engine in it (around 10k miles on it) but I always got around 28. The point is maybe your O2 sensor is causing a rich condition. Never a code at all?

Camry Mod

THIS

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post #13 of 41 Old 06-19-2019, 06:17 PM Thread Starter
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Originally Posted by SFCamry View Post
Welcome TwinCam2!


I am pretty sure my A/F sensor (O2) is going, as I will get running rich codes time to time and when I do my mpg drops down to 23 or so. Normally I get around 28 with mostly highway miles. But I do nave a new rebuilt engine in it (around 10k miles on it) but I always got around 28. The point is maybe your O2 sensor is causing a rich condition. Never a code at all?
When fully filled up, the computer says the cruising range is 323 miles. Definitely something is wrong. I just got this used, so I don't know why the previously sold it with such low mileage.

No check engine light, no code when scanned with OBD II scanner. The guy at the shop guessed it's O2 sensor.

How do you know yours is going? What code do you get? Has the check engine light ever on?
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post #14 of 41 Old 06-19-2019, 06:58 PM
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Get a tailpipe emission (smog) test done. High hydrocarbons and/or high carbon monoxide confirms a rich fuel mixture or worn out catalytic converter. If emissions are low then oxygen sensors are fine and something else is causing high fuel consumption. Such as: low transmission fluid level (most owners can't be bothered to read and follow factory manual fluid checking procedures), aftermarket spark plugs (usually come with overly wide gaps), dirty MAF sensor, dirty air filter, dirty throttle plate, non-stock tire and wheel sizes.
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post #15 of 41 Old 06-20-2019, 05:31 AM
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Do your brakes feel smooth or does the car pull to one side? Maybe you have a caliper hung up, applying the brakes all the time. To get a drop in mileage that much, I think you would be smelling brakes.

2013 Tundra SR5 TRD, 5.7L

2011 Sienna LE, 3.5L

2010 Camry LE, 2.5L
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