codes

[moranor@axis]

ok so i had what felt to me like a continued missfire the other day so i had my codes read:
code1:
202 Fuel trim bank 1 control limit (OBDIIO170;EUIIIO170)

code2:
203 Fuel trim bank 2 control limit (OBDIIO173;EUIIIO173)

code3:
242 missfire, cylinder 5 (OBDIIO305;EUIIIO305)

code4:
243 missfire, cylinder 6 (OBDIIO306;EUIIIO306)

code5:
241 missfire, cylinder 4 (OBDIIO304;EUIIIO304)

code6:
8 Signal, air-mass flow sensor (OBDIIO101;EUIIIO101)

how do i go about translating this into English?

Im guessing the missfires will be caused by spark plugs or coils?

after having them read they were cleared then the car was driven again and the codes were read again at the second reading no codes came up?

 

[moranor@axis]

found this if anyone is interested
the description for the codes are:

code1&2:
[Fuel trim (Bank 1&2),O2 control limit]
Controller for lambda is too long
beyond a min. or a max.

got no idea?

code3,4&5:
[Cyl. 5,6&4 misfire detected]
Crankshaft speed/acceleration is
monitored by crank sensor. Time for
each cylinder combustion is
compared against avg. of others. If
time for cylinder the is longer, fault will
set.

is this spark plugs or coils?

code 6:
[Mass air flow circuit range/perf.]
Failed signal range check against
predefined diagnostic limits.

could it be because of my air filter or a dirty MAF?

 

[freerider]

If the codes have been cleared and the problem is not persisting, I would guess a glitch in the system

Seriously though, with so many codes thrown I would clear it and see if they re-occurred before changing anything

 

[moranor@axis]

ok so good news
its what the mech said... he told me i should come in if it 'misfires' again

is there an easier way to reference these codes because with code1&2 i dont even know where to find the component that may be failing

 

[zaleonardz]

BMW DIS....

Generic code readers often are not worth the CD that they came on.

 

[Iceman007]

wait till they reoccur again because the codes dont have a date with it so it could have even happend before your time. So when it happens again go back and check what codes you get then you will know.

Thats why I service my own car and clear the history if there is any.

 

[moranor@axis]

i think its crazy the codes dont have a date... i mean how hard can it be for it to record a date with the code...

codes were reset at service when i bought the car...

what are lambda's for? i know they test O2 levels in the exhaust but how does that affect how the car runs...
are they used for other things as well?

Im thinking that my cats are dead and need to be taken out...that could explain codes1&2

how often do these things give random codes that are not real?

 

[Sankekur]

The O2 two sensor use the exhaust gasses to determine whether the car is running too rich or too lean, this allows the ecu to make the appropriate adjustments.

 

[moranor@axis]

would changing the exhaust and air filter not take it out of the paramiters it is suposed to run in... making the ecu think the sensors are broken?

 

[Sankekur]

as far as I know only removing the cats can cause problems, but only if you have a set of sensors before and after the cats. (I think you have the M52 engine so I think this shouldn't be a problem)
Other than that from what I have read the ecu should adapt itself to a filter change, but you would probably need to chip to get the full advantage from changing the exhaust.

 

[moranor@axis]

after i do my exhaust and chip ill check the codes again to see if the come up...
i know after the branches there is only 1 lambda then i think there are 2 in the branches...

 

[johanventer]

Moranor

Here you go:

http://dl.dropbox.com/u/10460682/Error codes.pdf

 

[moranor@axis]

thanks

some of these codes cover alot of systems

 

[moranor@axis]

ok so it happened again and i had the codes read same ones came up...
the mech said they had a similar thing happen with another BM and it ended up being a vacuum leak on the intake:dunno:

what do you guys think?

 

[StK]

When I saw the codes I thought that you have an airleak somewhere....Usual cause for setting off so many of those particular codes..especially Lambda sensors coupled with misfire...One of my mech mates has a smoker-which basicaly puts smoke in the intake and you can see exactly where it escapes from showing up any airleaks easily and quickly :thumbsup: Definately worth looking for an airleak

 

[moranor@axis]

that was my next question:
what is the easiest way to find leaks

 

[moranor@axis]

ok so replaced what i thought was the problem:

replaced part 3 and 5
part 5 was very cracked and i could stick my finger into a section of it...

but yesterday it had the misfire again :cursin: should i juts take the intake manifold off and replace all the seals or could it be a faulty MAF causing this?