P0171 system too lean bank 1

Started by delhusband, August 1, 2017, 09:05

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delhusband

August 1, 2017, 09:05 Last Edit: January 1, 1970, 01:00 by Guest
Hi, had my lhs O2 sensor out and back in yesterday. Don't know if it's related, but got eml. Checked fault code with my Bluetooth reader, it's saying p0171 power train, system too lean bank one, can anyone advise?

Justin.D

#1
August 1, 2017, 11:22 Last Edit: January 1, 1970, 01:00 by Guest
I had this but with P0174 Bank 2. First thing is to determine if it's a duff sensor - I would swap the sensors over and see if the problem stays at bank 1 or follows the sensor

My issue followed the sensor so I got a new one and fitted it myself - All fixed. Hopefully yours will be an easy fix
Click for my Readers Ride

m1tch

#2
August 1, 2017, 12:20 Last Edit: January 1, 1970, 01:00 by Guest
Are you seeing voltage on all 3 sensors?

delhusband

#3
August 1, 2017, 12:30 Last Edit: January 1, 1970, 01:00 by Guest
I'll try and check, bit new to using odb2 reader but I reckon I know how to add dials to check this. I'll have a look this lunchtime and report back

delhusband

#4
August 1, 2017, 12:54 Last Edit: January 1, 1970, 01:00 by Guest
Yeah, Ok, 0v sensor 1. I'll check it's not loose termination of plugs/melted cable. Guess OtherStu right enough about playing with these!  

Mrcypher

#5
August 1, 2017, 15:52 Last Edit: January 1, 1970, 01:00 by Guest
I had this other day, unplugged and replugged all sensors and made sure was connected proper, seems to have stayed off for now but i get a different code every other journey with the full decat...

It can also relate to maf aswell so might be worth giving that a clean, also check no leaks from induction/air box

m1tch

#6
August 1, 2017, 17:01 Last Edit: January 1, 1970, 01:00 by Guest
Looks like your right O2 sensor on the manifold might have failed - is the engine up to temp etc?

Also what are your long term and short term fuel trims?

delhusband

#7
August 1, 2017, 18:36 Last Edit: January 1, 1970, 01:00 by Guest
During short drive, car warm

delhusband

#8
August 1, 2017, 18:38 Last Edit: January 1, 1970, 01:00 by Guest
Idling, car warm

delhusband

#9
August 1, 2017, 18:42 Last Edit: January 1, 1970, 01:00 by Guest
OK, rhs O2 plug loose, reconnected, I'll try again, sorry

delhusband

#10
August 1, 2017, 18:47 Last Edit: January 1, 1970, 01:00 by Guest
With rhs plugged in properly, during drive

delhusband

#11
August 1, 2017, 18:52 Last Edit: January 1, 1970, 01:00 by Guest
So, I think that means O2 sensors are OK, just didn't plug rhs one back in properly. I removed both plugs, but only physically removed lhs sensor from manifold. Does that sound right?

delhusband

#12
August 1, 2017, 19:01 Last Edit: January 1, 1970, 01:00 by Guest
Thanks M1tch, Justin & Mr cypher. I've been a tw@t. Because I'd only physically removed the lhs I wasn't paying attention to rhs. Note to self, check twice before posting. Thanks again, pants of shame application in the post

Chilli Girl

#13
August 1, 2017, 20:24 Last Edit: January 1, 1970, 01:00 by Guest
We've all been there Derek.  Foxy's side windows kept misting up, thought there was a problem with the demister, couldn't work out the problem at all, it was because I had the side vents shut all the way along!  I felt a right idiot.
Ex owners of Chilli red facelift 52 reg called Chilli, silver 55 reg called Foxy and blue pfl W reg MR-S called Sapphire. Now 2 less!

delhusband

#14
August 1, 2017, 22:04 Last Edit: January 1, 1970, 01:00 by Guest
Quote from: "Chilli Girl"We've all been there Derek
Lol! I'm there on a daily basis Jane
Mind you, the guy I bought the car off thought his passenger window was broken, until i showed him the override switch  s:) :) s:)

paulj

#15
August 3, 2017, 18:52 Last Edit: January 1, 1970, 01:00 by Guest
I hope you didn't show him until after you agreed a price
Today
2000 x reg pfl - blue - as original no mods
In the late 1980's
1982 x reg Toyota Corolla Liftback Coupe (also blue)
1978 s reg Mitsubishi Celeste Coupe (yellow)

delhusband

#16
August 3, 2017, 22:52 Last Edit: January 1, 1970, 01:00 by Guest
Quote from: "paulj"I hope you didn't show him until after you agreed a price
*sigh* no, I'm a sucker, I almost gave him full asking price. I got all misty eyed and excited at the  
 prospect of having another 2. He did very kindly provide a set of discs and pads to cover the mot advisory on the car

K T M Rider

#17
August 11, 2017, 09:23 Last Edit: January 1, 1970, 01:00 by Guest
Quote from: "delhusband"With rhs plugged in properly, during drive


that all looks very handy - I think things have moved on in the last few years - is this the torque app ? Does it just require a random generic ebay bluetooth obd port adaptor to work?
Grey 2012 GT86 / ex 2001 W / 2003 03 /2003 53 MR2s
Orange 2019 Aygo Xcite Daily Driver

delhusband

#18
August 11, 2017, 15:15 Last Edit: January 1, 1970, 01:00 by Guest
Hi, yeah this was torque app on android smartphone, with an elm327 Bluetooth dongle
See here for pic (maybe... I'm still trying to get used to Flickr!)
https://flic.kr/p/XxaEpr

delhusband

#19
August 11, 2017, 15:22 Last Edit: January 1, 1970, 01:00 by Guest
I won't pretend I understand these graphs.  I was really just looking for non zero values on O2 sensors. I'm learning though....  s:) :) s:)

shnazzle

#20
August 11, 2017, 16:42 Last Edit: January 1, 1970, 01:00 by Guest
Don't. Fuel trims leads to timing, timing leads to engine management, that is a rabbit hole and I can't find the way out

Sent from my ONEPLUS A5000 using Tapatalk
...neutiquam erro.

delhusband

#21
August 11, 2017, 17:14 Last Edit: January 1, 1970, 01:00 by Guest
Lol! E2V has kindly given me some reading to do - Currently in the Haynes guide to tuning. For now, MAF and intake temp graphs self explanatory, fuel trims I guess is fuel feed adjustment based on many inputs so i guess i would need to look at more data to understand better.
Its the O2 graphs that got me mesmerised. I  O2 voltage on 1x1 dip and O2 2x1 spike coincided with acceleration/increased throttle. I take it voltage decreases with reducing O2?
I'd have guessed, if +v = + O2, then on the graphs above, O2 1x1 is exhaust, O2 2x1 is intake, and i have no idea what O2 1 x 2 is telling me because i thought that was also intake on other side of heat sheild from 2 x 1. I dont understand.

delhusband

#22
August 11, 2017, 17:35 Last Edit: January 1, 1970, 01:00 by Guest
Yeah, and timing! who knew there was a position sensor on the crankshaft that helps change ignition timing based on rotation speed to make sure expansion happens at the right rate and time! (Probably a lot of peeps on this forum except me  s:D :D s:D  ). Back to my books......ive only had idiots guide to 4 stroke before now, much more to learn

K T M Rider

#23
August 11, 2017, 22:51 Last Edit: January 1, 1970, 01:00 by Guest
Quote from: "delhusband"Hi, yeah this was torque app on android smartphone, with an elm327 Bluetooth dongle
See here for pic (maybe... I'm still trying to get used to Flickr!)
https://flic.kr/p/XxaEpr

Thanks

Quote from: "delhusband"Yeah, and timing! who knew there was a position sensor on the crankshaft that helps change ignition timing based on rotation speed to make sure expansion happens at the right rate and time! (Probably a lot of peeps on this forum except me  s:D :D s:D  ).

Well I might have got there eventually...... (I can vaguely recall the existence of the ignition advance / retard concept and I  was aware of crank p.s. just hadn't stopped to consider what the ECU would be doing with the information   s:) :) s:)  ).

Have always been more interested in the nuts and bolts side of engines which haven't fundamentally changed from the first one I worked on 31 years ago (a points ignition, 100cc air cooled single Suzuki motorcycle engine).
Grey 2012 GT86 / ex 2001 W / 2003 03 /2003 53 MR2s
Orange 2019 Aygo Xcite Daily Driver

delhusband

#24
August 11, 2017, 23:21 Last Edit: January 1, 1970, 01:00 by Guest
Quote from: "KTM_RIDER"Well I might have got there eventually...... (I can vaguely recall the existence of the ignition advance / retard concept and I  was aware of crank p.s. just hadn't stopped to consider what the ECU would be doing with the information   s:) :) s:)  ).

Have always been more interested in the nuts and bolts side of engines which haven't fundamentally changed from the first one I worked on 31 years ago (a points ignition, 100cc air cooled single Suzuki motorcycle engine).
Hi KTM_RIDER, that comment i made about timing, that was in response to shnazzles quote, hope i didnt come across as really rude, because i literally am clueless about engine management. I'm trying to understand what i was seeing on torque.   s:bowdown: :bowdown: s:bowdown:
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