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Old 06-24-2018, 12:34 AM   #6 (permalink)
mpg_numbers_guy
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Toby - '13 Toyota Prius C
Team Toyota
90 day: 63.99 mpg (US)

Daz - '15 Mazda 3 iTouring w/ Tech Package
Team Mazda
90 day: 38.2 mpg (US)
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Quote:
Originally Posted by Stubby79 View Post
Wide-band?

If not, a generic one with the right # of wires should work and cost a heck of a lot less.
P0135 error code.

Quote:
Originally Posted by California98Civic View Post
Don't throw parts at the problem until you have properly tested and know what the issue is. You could waste money and time and get angrier. Your FE drop could be caused by a few things, including a vacuum leak or a bad MAP sensor. How do you know it is the O2? You have a code? (Btw, you can't use the wide band in a non-leanburn Civic).

EDIT 1: I thought you had an LX, but you have the EX. It might use a wide band. Not sure.
It's the P0135 code that it threw me at near the beginning of this tank.

Would the other things you mentioned, vacuum leak and bad MAP sensor, throw CEL codes?

Quote:
Originally Posted by California98Civic View Post
EDIT 2: Also, does a Torque app need calibration? Part of your problem could be the app is not calibrated properly and is misinforming you so that you get quite a surprise when you get to the pump. Calibration might help.
Torque never showed a dip in FE after the CEL came on for me.

I haven't bought the PRO version of the app yet, so I don't think there's a way to calibrate it. It was fairly accurate for the last quarter of my previous tank, within 1 mpg, when comparing it's output with my eyeball comparison on the fuel gauge (20 tick marks on the fuel gauge make it fairly accurate ) and the actual mileage.

But there's like literally no way this tank should've been lower. Previous tank was 42.5 with half the ecomods and no instrumentation for most of it. This tank had warmer weather, more ecomods (that tested for positive improvement), better routes, and P&G for the last half of it, with 5 trips over 60 MPG indicated. 48 is reasonable enough compared to my previous tank, and the only negative change I can think of is the O2 sensor light.

Quote:
Originally Posted by Xist View Post
Honda Parts Now charges over three hundred for each oxygen sensor. They have competitive prices on OEM parts. Rock Auto has NTK sensors for $162. I have never found a better price than Rock Auto.
My dad works at a Honda dealership so he can get me one for $200-$210 I think? And I thought that with Hondas going with off brand parts is just asking for them to fail sooner down the road?

Quote:
Originally Posted by Xist View Post
Please do troubleshoot! Good luck!
Ugh but thanks lol.

Quote:
Originally Posted by oil pan 4 View Post
The O2 sensor is a consumable item. Plan on replacing them every 70k to 100k miles for best fuel mileage.
Should've asked about that when negotiating for the car back in January.

Quote:
Originally Posted by oil pan 4 View Post
If you buy a universal O2 sensor you can just about cut the price in half but you have cut off and reuse the vehicle sensor plug.
How hard is that to do compared to just replacing the sensor with the "right" one?
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2013 Toyota Prius C 2 (my car)


2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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