Lambchop

iTrader: (1)

As title. Need to change my lambda sensor on bank one. Which side of the engine is that then?

Won't say which side is which yet but one is a caker and the other could be a twat to change. PLEASE let it be the good side

carlo

iTrader: (4)

Im pretty sure bank one is the first 3 mate i can find out for sure in the morning. Its usually bank 1 before cat that goes

Lambchop

iTrader: (1)

by 1st 3 which side do you mean?

is this common then? i found out while lpg guy was mapping. no fault code on dash either. then plugged in diagnostics to obd port and bank 2 is leaning off but bank 1 is ADDING fuel

and yes its my PRE cat bank 1 fucked.

from here http://www.xoutpost.com/bmw-sav-foru...-bank-1-a.html

bank 1 is drivers side. if it is you can touch the sensor so should be fine. however other side is under LOADS of stuff

carlo

iTrader: (4)

Well its a 6 cylinder aint it? if your under the car there is 2 exhaust manifolds 3 pipes each so the first 3 being closest to the water pump run your hand down & follow that one untill you get to the sensor..As the back 3 will take you to bank 2's cat

Barry_GTi

I am lost here, it's a straight 6 cylinder so what do you mean by side?

graham c

iTrader: (5)

bank 1 is the top one before the cat

Lambchop

iTrader: (1)

Ok yeah i've actually confused myself here after reading my link above which will be the v8 engine with "sides".


"one"? there are 2 precat and 2 post cat.


Carlo if you could post a pic that would be ace. Assume you'll have a 3.0 engine car in at the mo

When you look in at drivers side you can see one sensor. Not sure if thats bank1 or 2 though.

carlo

iTrader: (4)

Awright mate we dont have any in at the moment beleive it or not.
bank 1 is defo the first 3 cylinders & its before the cat so as i said before closest the the water pump front of the engine the first 3 follow the downpipe with your finger the first sensor you come to thats the one. you will see the manifolds are 3 & 3

carlo

iTrader: (4)

Just mind the light wont go out straight away mate it will take a few runs to reset

Lambchop

iTrader: (1)

ok it was dark when i looked for them last night but i can see both top sensors now. so it's the one at the FRONT of the engine i need to change?


funny thing is the light isn't on. it has been but it seems to come and go

only noticed it on plugging the diagnostic in to the port under the dash and watching the lambda readings.

carlo

iTrader: (4)

Yes mate that runs off the first 3 banks

carlo

iTrader: (4)

Just a thought mate make sure your oil cap is on properly this can cause air leak & it shows lambda fault, also there is breather hoses under the inlet that can cause this as well.Both show a sensor fault but its caused by weak mixture.

Lambchop

iTrader: (1)

checked oil yest so i know that it's right now.

do these engines use water? mate reckons they do. i think i have a small leak somewhere.

NEIL A

iTrader: (6)

Chop i use to get lean on bank 1 flashing up on mine , took it to a local bm specialist and he traced the fault straight away. Traced it to a split in the inlet hose before the throttle body a fairly common failure that shows up as bank lean.

carlo

iTrader: (4)

They shouldnt use water mate at all , neil thats the one all 6 cylinders do this

JonnyBravo

Is this on LPG Chop ?

As mentioned air leak, poor mixture from LPG (if its been done)

bank one sensor 1 is the first sensor on the first 3 cylinders nearest the front panel.

If your using an OBD tool too flash code it go to parameters and select sensor one and then disconnect the sensor, if you lose the readings you obviously know you have the right sensor.

Worst scenario is a CAT fault but its more likely to be a simple lambda fault or air leak

Lambchop

iTrader: (1)

this is my lpg x5 yes mate however the lambda readings were checked on PETROL. Bank 1 is richening the mixture 10% and Bank 2 is at -2%. Obviously keeps changing but bank 1 is up and down all over the place.

Lambchop

iTrader: (1)

Could you describe how to see it mate? Can you see it from the top?

thanks.

chop

NEIL A

iTrader: (6)

Chop if you look in these pics there is an open 3" hose on the left hand side im sure it was that one that split on mine , its after the maf sensor so the engine runs lean.

http://cgi.ebay.co.uk/BMW-E53-X5-3-0...d=p3286.c0.m14

JonnyBravo

The petrol ecu may of re learnt on lpg after seeing a weak mixture on that bank and when on petrol its causing a EML to come on due to the fuelling being wrong.

Not uncommon, usually caused by air leaks, dirty injectors etc.. but unless you have a BMW scanner you can't zero the ecu's info to see if it only does it on one fuel.

I'd say your on the right track though with what Neil has mentioned.

Does it run the funny air bypass system across the inlet manifold ? if so are the lpg pipes before or after that or dip tubed ?

The straight 6's with air bypass have caused a few odd faults in the past

Lambchop

iTrader: (1)

rriiiiiiiiggggggggghhhhhhhhhht that's so far over my head

JonnyBravo

Just keep looking for air leaks for now