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California98Civic · 06-23-2018, 05:13 PM

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.

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.

06-23-2018, 05:13 PM	#3 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 Black and Green - '98 Honda Civic DX Coupe Team Honda 90 day: 66.42 mpg (US) Black and Red - '00 Nashbar Custom built eBike 90 day: 3671.43 mpg (US) Thanks: 2,373 Thanked 2,174 Times in 1,470 Posts	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. 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. __________________ See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread. Last edited by California98Civic; 06-23-2018 at 05:49 PM..