CEL code, need some help

^tyrant^

Member
i got a obd2 scanner that hooks up to my laptop, the code that i keep getting is

Powertrain, Fuel Trim too lean (Bank 1)

Ive been getting this code for quite awhile now, i think i started getting the code when it started getting warmer out. it seems to go away when i put the stock airbox back on, so we first thought that i had a leak on the turbo with the injen on but i dont think that is the case, ive reinstalled the injen and made sure it was on tight. Ive taken it to mazda once on this and they said i might have a bad o2 but they didnt replace it for what ever reason. Some times the CEL will be off the next day when i get up in the morning it make no sense at all. Im going to get some more data from the obd2 and post here in a bit.
 
Time for a run to the stealership.
Don't reset it until they see it.
Good luck!
 
here is a log from the obd2, it is just of O2 Sensor Voltage Bank 1 Sensor 1

0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 0080 , 0 , 8/13/2004 8:37:17 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 0C7F , 0.06 , 8/13/2004 8:37:41 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 0D83 , 0.065 , 8/13/2004 8:38:05 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 0D87 , 0.065 , 8/13/2004 8:36:14 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 0F7F , 0.075 , 8/13/2004 8:36:53 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 1280 , 0.09 , 8/13/2004 8:37:51 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 1D7F , 0.145 , 8/13/2004 8:37:12 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 377F , 0.275 , 8/13/2004 8:37:46 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 4880 , 0.36 , 8/13/2004 8:37:31 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 4A83 , 0.37 , 8/13/2004 8:38:01 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 6C85 , 0.54 , 8/13/2004 8:36:19 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 7C7D , 0.62 , 8/13/2004 8:38:15 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 8887 , 0.68 , 8/13/2004 8:36:23 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 937A , 0.735 , 8/13/2004 8:37:07 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 9688 , 0.75 , 8/13/2004 8:36:09 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 9A7B , 0.77 , 8/13/2004 8:36:57 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 9B80 , 0.775 , 8/13/2004 8:38:10 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , 9D81 , 0.785 , 8/13/2004 8:36:48 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A17A , 0.805 , 8/13/2004 8:37:22 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A28B , 0.81 , 8/13/2004 8:36:28 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A37E , 0.815 , 8/13/2004 8:37:27 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A37F , 0.815 , 8/13/2004 8:38:20 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A381 , 0.815 , 8/13/2004 8:37:36 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A387 , 0.815 , 8/13/2004 8:36:04 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A57F , 0.825 , 8/13/2004 8:37:02 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A587 , 0.825 , 8/13/2004 8:36:33 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A683 , 0.83 , 8/13/2004 8:37:56 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , A78A , 0.835 , 8/13/2004 8:35:59 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , B487 , 0.9 , 8/13/2004 8:36:38 PM
0114 , O2 Sensor Voltage Bank 1 Sensor 1 , C47F , 0.98 , 8/13/2004 8:36:43 PM

Sensor 2 looks like this all the time, could it be the MIL on the o2? (hehe)
0115 , O2 Sensor Voltage Bank 1 Sensor 2 , 5AFF , 0.45 , 8/13/2004 8:36:00 PM
 
Here is the data from the MAF

0110 , MAF Air Flow gm/Sec , 00A5 , 1.65 , 8/13/2004 8:37:55 PM
0110 , MAF Air Flow gm/Sec , 00A9 , 1.69 , 8/13/2004 8:38:00 PM
0110 , MAF Air Flow gm/Sec , 00A9 , 1.69 , 8/13/2004 8:38:15 PM
0110 , MAF Air Flow gm/Sec , 00A9 , 1.69 , 8/13/2004 8:38:19 PM
0110 , MAF Air Flow gm/Sec , 00AD , 1.73 , 8/13/2004 8:36:03 PM
0110 , MAF Air Flow gm/Sec , 00AD , 1.73 , 8/13/2004 8:37:36 PM
0110 , MAF Air Flow gm/Sec , 00AD , 1.73 , 8/13/2004 8:37:45 PM
0110 , MAF Air Flow gm/Sec , 00AD , 1.73 , 8/13/2004 8:38:05 PM
0110 , MAF Air Flow gm/Sec , 00B0 , 1.76 , 8/13/2004 8:36:23 PM
0110 , MAF Air Flow gm/Sec , 00B0 , 1.76 , 8/13/2004 8:37:31 PM
0110 , MAF Air Flow gm/Sec , 00B0 , 1.76 , 8/13/2004 8:37:50 PM
0110 , MAF Air Flow gm/Sec , 00B4 , 1.8 , 8/13/2004 8:36:08 PM
0110 , MAF Air Flow gm/Sec , 00B4 , 1.8 , 8/13/2004 8:36:13 PM
0110 , MAF Air Flow gm/Sec , 00B4 , 1.8 , 8/13/2004 8:36:18 PM
0110 , MAF Air Flow gm/Sec , 00B4 , 1.8 , 8/13/2004 8:37:26 PM
0110 , MAF Air Flow gm/Sec , 00B4 , 1.8 , 8/13/2004 8:37:41 PM
0110 , MAF Air Flow gm/Sec , 00B4 , 1.8 , 8/13/2004 8:38:10 PM
0110 , MAF Air Flow gm/Sec , 00B8 , 1.84 , 8/13/2004 8:35:59 PM
0110 , MAF Air Flow gm/Sec , 00B8 , 1.84 , 8/13/2004 8:36:33 PM
0110 , MAF Air Flow gm/Sec , 00BC , 1.88 , 8/13/2004 8:36:28 PM
0110 , MAF Air Flow gm/Sec , 00DB , 2.19 , 8/13/2004 8:37:21 PM
0110 , MAF Air Flow gm/Sec , 0148 , 3.28 , 8/13/2004 8:36:42 PM
0110 , MAF Air Flow gm/Sec , 027F , 6.39 , 8/13/2004 8:36:57 PM
0110 , MAF Air Flow gm/Sec , 02B9 , 6.97 , 8/13/2004 8:36:37 PM
0110 , MAF Air Flow gm/Sec , 02F1 , 7.53 , 8/13/2004 8:36:47 PM
0110 , MAF Air Flow gm/Sec , 0303 , 7.71 , 8/13/2004 8:37:11 PM
0110 , MAF Air Flow gm/Sec , 0314 , 7.88 , 8/13/2004 8:37:02 PM
0110 , MAF Air Flow gm/Sec , 0314 , 7.88 , 8/13/2004 8:37:07 PM
0110 , MAF Air Flow gm/Sec , 0372 , 8.82 , 8/13/2004 8:36:52 PM
0110 , MAF Air Flow gm/Sec , 0406 , 10.3 , 8/13/2004 8:37:16 PM
 
Data from intake temp

010F , Intake Air Temp (F/C) , 53 , 109 , 43 , 8/13/2004 8:35:58 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:03 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:08 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:12 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:17 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:22 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:27 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:32 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:37 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:42 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:47 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:51 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:36:56 PM
010F , Intake Air Temp (F/C) , 54 , 111 , 44 , 8/13/2004 8:37:01 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:06 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:11 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:16 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:20 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:25 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:30 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:35 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:40 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:45 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:50 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:54 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:37:59 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:38:04 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:38:09 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:38:14 PM
010F , Intake Air Temp (F/C) , 55 , 113 , 45 , 8/13/2004 8:38:19 PM
 
That data says nothing of the situation of which it was taken.....frankly it's junk. Bank1 fuel trim too lean means 1 of two things, either the engine is running rich and it leaning it out makes it go out of its set parameters or vice versa. A bad O2 sensor would be one of the last things I would be looking at. Is the idle smooth? Does it misfire?

Check ALL vacuum lines,
Check fuel pressure reg. ensure it holds vacuum, try applying vacuum and watch your O2 sensor switching through scan tool,
Check intake system for leaks AFTER maf,
Check MAF sensor for contamination (doesn't take much of anything, trust me),
If all else is good then I would replace the O2 sensor. I highly doubt that its the O2 sensor though.
 
ok i check every thing you listed tomarrow, the only thing im not sure how to check is the second thing you posted.
 
If you don't have a vacuum pump nevermind lol. What you guys didn't spend over 11k in tools last year??
 
not i, the stupid dealer has looked at the car once for the same code, they are the ones the first said it could be a bad o2 but they didnt replace it. Ill check what i can tomarrow and see how it goes, if everything looks ok to me its going back to dealer
 
Your car have a air leak after the maf

my car leak by the actuator

check all your intercooler pipes

THis read is by my carchip

from www.carchip.com
View / Vehicle Trouble Log / Record Problem 1
Overview
Time : 8/2/2004 6:15 AM
Vehicle : mazdaspeed
CarChip : J-3809-B
Trouble Code : P0171
Description : System Too Lean (Bank 1)
Comments :
Engine Status
Fuel Pressure (Gage) :
Intake Manifold Pressure (Absolute) :
Engine Coolant Temperature : 192.2 F
Calculated Load Value : 16.5 %
Engine Speed : 705 RPM
Vehicle Speed : 0 MPH
Fuel Trim Status
Short-Term Fuel Trim (Bank 1) : 10.16 %
Short-Term Fuel Trim (Bank 2) :
Long-Term Fuel Trim (Bank 1) : 25.00 %
Long-Term Fuel Trim (Bank 2) :
Fuel System Status
Fuel System 1 Status :
Fuel System 2 Status : Closed loop; using oxygen sensor(s) as feedback for fuel control.
 
look the code come at 750 rpm this is a small leak lean the idle




^tyrant^ said:
im getting the same Trouble Code : P0171 , im going to check every damn thing in the engine that can leak tomarrow
 
it does not matter anymore its someone elses problem not he got a srt-4 now
 
PHILLY-ORANGE said:
Where did you get a obd2 for your laptop and did you need a program to read the codes?
scantool.com it come with a prog. but its not good. im me on AIM and i can get you the rest of the info.
 
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