[juicehound]

ok so my 09 335i has a TON of codes even after doing brand new injectors and plugs coded perfectly. also, all coils are seated properly.

if i know what the problem is, i'll just fix it.
problem is, i can't diagnose very well.

Codes from my cobb ap are:

P0420 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 1
P0430 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 2
P0305 - CYL. 5 MISFIRE
P29F4 - CATALYTIC CONVERSION
P29F5 - CATALYTIC CONVERSION 2
P29D1 - CYL. 5 MISFIRE
P29CD - CYL. 1 MISFIRE
P29CC - MISFIRE MORE CYL.
P29D2 - CYL. 6 MISFIRE
P29CE - CYL. 2 MISFIRE
P29D9 - MISIFRE W/ LOW FUEL LEVEL
P29D0 - CYL. 4 MISFIRE

These are the codes that had no description:
H2DED
H2FCA
H2FDA
H29CF
H29D2
H29CE
H29CC
H29DB

PLEASE HELP !

[lordbmw]

Cyl 3 is good

With that many codes, may be it's battery related?

[juicehound]

lol
battery is fine for sure

[maxoutput]

Maybe high pressure fuel pump issue ?

[juicehound]

i have no idea - what i need to know if how to find out what the problem is based upon the codes i am throwing.

[335e92tx]

so this is during normal driving?? WFO? idle?
what?

And you might want to try the AA board - http://www.e90post.com/forums/forumdisplay.php?f=58 Dont worry about the cat ones now. They are missfire related. Check all grounds to injectors.

[Mashman]

Originally Posted by juicehound

ok so my 09 335i has a TON of codes even after doing brand new injectors and plugs coded perfectly. also, all coils are seated properly.

if i know what the problem is, i'll just fix it.
problem is, i can't diagnose very well.

Codes from my cobb ap are:

P0420 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 1
P0430 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 2
P0305 - CYL. 5 MISFIRE
P29F4 - CATALYTIC CONVERSION
P29F5 - CATALYTIC CONVERSION 2
P29D1 - CYL. 5 MISFIRE
P29CD - CYL. 1 MISFIRE
P29CC - MISFIRE MORE CYL.
P29D2 - CYL. 6 MISFIRE
P29CE - CYL. 2 MISFIRE
P29D9 - MISIFRE W/ LOW FUEL LEVEL
P29D0 - CYL. 4 MISFIRE

These are the codes that had no description:
H2DED
H2FCA
H2FDA
H29CF
H29D2
H29CE
H29CC
H29DB

PLEASE HELP !

The 'H' codes are historical. When was the last time you had the car walnut blasted? One possibility for those codes, it that the intake valves have excessive buildup.

[PichaDis11]

With that many misfires good to torque those plugs again.

[TemjinX2]

i would check your plugs and coils again. try swapping the coil in cylinder 3 and see if it gets rid of one of the miss fires to make sure its not bad coils. Make sure none of the connections are loose.

[juicehound]

the car has never been walnut blasted and i'm at 129k miles now so i'm pretty sure i need that BAD

i will clear all the codes and swap out coil number 3 with coil number 5 and see what happens and report back

i haven't been driving the car hard at all b/c of these issues

[juicehound]

ok so here's the latest - found out i have a bad coil
i replaced it and cleared the codes and the SES light just came on again but now there's only these 4 codes:

P0420 Catalyst system efficiency below threshold bank 1
P0430 Catalyst system efficiency below threshold bank 2
P29F4 Catalytic conversion
P29F5 Catalytic conversion 2

So i'm thinking that i need cats - am i correct ?

if so which cats are bad as there are four of them...options?

i DO NOT want to deal with the problems of passing emissions with catless downpipes etc. but at the same time i AM NOT willing to shell out 4k for 4 brand new genuine bmw cats

ideas ?

[PichaDis11]

Originally Posted by juicehound

ok so here's the latest - found out i have a bad coil
i replaced it and cleared the codes and the SES light just came on again but now there's only these 4 codes:

P0420 Catalyst system efficiency below threshold bank 1
P0430 Catalyst system efficiency below threshold bank 2
P29F4 Catalytic conversion
P29F5 Catalytic conversion 2

So i'm thinking that i need cats - am i correct ?

if so which cats are bad as there are four of them...options?

i DO NOT want to deal with the problems of passing emissions with catless downpipes etc. but at the same time i AM NOT willing to shell out 4k for 4 brand new genuine bmw cats

ideas ?

My first pick is you need to have the car scanned with a BMW software such INPA or Rheingold. That should give more details to the other codes.

[Shotputted]

Originally Posted by juicehound

ok so here's the latest - found out i have a bad coil
i replaced it and cleared the codes and the SES light just came on again but now there's only these 4 codes:

P0420 Catalyst system efficiency below threshold bank 1
P0430 Catalyst system efficiency below threshold bank 2
P29F4 Catalytic conversion
P29F5 Catalytic conversion 2

So i'm thinking that i need cats - am i correct ?

if so which cats are bad as there are four of them...options?

i DO NOT want to deal with the problems of passing emissions with catless downpipes etc. but at the same time i AM NOT willing to shell out 4k for 4 brand new genuine bmw cats

ideas ?

Could be the O2 sensors too which would be a lot cheaper and easier. If you need new cats and don't want aftermarket I would look for used because I bet there are quite a few people who went catless and would sell the oem dp pretty cheap.

[juicehound]

Originally Posted by PichaDis11

My first pick is you need to have the car scanned with a BMW software such INPA or Rheingold. That should give more details to the other codes.

i have inpa so what should i look to do ?

Originally Posted by Shotputted

Could be the O2 sensors too which would be a lot cheaper and easier. If you need new cats and don't want aftermarket I would look for used because I bet there are quite a few people who went catless and would sell the oem dp pretty cheap.

it "could" but i do NOT want to change the o2 sensors and still find out that it's the cats - i need a definitive way to determine this

[RocketSurgeon]

I think you might already have catless downpipes. All four of your current codes point towards that.
Pop open your hood and look down the left side of the engine, by the turbos. Just below the rear turbo wastegate actuator, you will see the downpipe. Is it big and bronze colored with a clearly visible BMW logo? You should be able to see it pretty easily just by opening the hood, though you might want a flashlight.

[BashShah]

Originally Posted by juicehound

i have inpa so what should i look to do ?

Scan your Car and see what INPA says and report it's findings.
what are you waiting for?

[nissubaru]

Originally Posted by juicehound

ok so my 09 335i has a TON of codes even after doing brand new injectors and plugs coded perfectly. also, all coils are seated properly.

if i know what the problem is, i'll just fix it.
problem is, i can't diagnose very well.

Codes from my cobb ap are:

P0420 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 1
P0430 - CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK 2
P0305 - CYL. 5 MISFIRE
P29F4 - CATALYTIC CONVERSION
P29F5 - CATALYTIC CONVERSION 2
P29D1 - CYL. 5 MISFIRE
P29CD - CYL. 1 MISFIRE
P29CC - MISFIRE MORE CYL.
P29D2 - CYL. 6 MISFIRE
P29CE - CYL. 2 MISFIRE
P29D9 - MISIFRE W/ LOW FUEL LEVEL
P29D0 - CYL. 4 MISFIRE

These are the codes that had no description:
H2DED
H2FCA
H2FDA
H29CF
H29D2
H29CE
H29CC
H29DB

PLEASE HELP !

I read the whole thread so pardon me if I missed it but how long have you had this car and what do you know about it in terms of modifications? Another poster above mentioned you might already have catless downpipes but if you've had the car for a while and didn't put on catless downpipes then we can rule that out.

If that's the case then I would suspect your O2 sensors are the problem. I know you said you need a definitive way to test this without replacing the O2 sensors first but that's the only way. However, there are 4 O2 sensors on these cars and you might only need to replace two. In order to figure that out you need to get yourself a better scan tool. If you can hook it up to MHD (free for reading codes) you can get the actual BMW codes instead of the OBDII codes. They don't help as much on these cars.

I had 29E0 and 2A2B when my upstream o2 sensors needed to be replaced. Swapped them out and my codes were gone. Super easy fix but you have to be willing to try to fix it first otherwise you'll never get it done.

[kfriceman]

Pretty easy to determine the problem, take it to a professional who does this work for a living.

-Kevin

[juicehound]

Originally Posted by RocketSurgeon

I think you might already have catless downpipes. All four of your current codes point towards that.
Pop open your hood and look down the left side of the engine, by the turbos. Just below the rear turbo wastegate actuator, you will see the downpipe. Is it big and bronze colored with a clearly visible BMW logo? You should be able to see it pretty easily just by opening the hood, though you might want a flashlight.

i def do not have catless downpipes but that would be a good idea

Originally Posted by DarkNemesis

Scan your Car and see what INPA says and report it's findings.
what are you waiting for?

um maybe i don't know how to do that ! LOL any help would be nice

Originally Posted by nissubaru

I read the whole thread so pardon me if I missed it but how long have you had this car and what do you know about it in terms of modifications? Another poster above mentioned you might already have catless downpipes but if you've had the car for a while and didn't put on catless downpipes then we can rule that out.

If that's the case then I would suspect your O2 sensors are the problem. I know you said you need a definitive way to test this without replacing the O2 sensors first but that's the only way. However, there are 4 O2 sensors on these cars and you might only need to replace two. In order to figure that out you need to get yourself a better scan tool. If you can hook it up to MHD (free for reading codes) you can get the actual BMW codes instead of the OBDII codes. They don't help as much on these cars.

I had 29E0 and 2A2B when my upstream o2 sensors needed to be replaced. Swapped them out and my codes were gone. Super easy fix but you have to be willing to try to fix it first otherwise you'll never get it done.

thanks for that - i can def change out the o2 sensors myself but i don't want to do that unless i know for certain that's the issue

the car is bone stock basically

i'm thinking its the cats b/c when i try to boost on power i don't get much - i think it's getting worse - feels bogged down

Originally Posted by kfriceman

Pretty easy to determine the problem, take it to a professional who does this work for a living.

-Kevin

well aren't you super helpful ! lol i am trying to avoid paying a diag fee here kevin

[youngstunt22]

I had just purchased this car its completely stock with 120k on it. From the start i had a tpm sensor light on, after driving like 2k miles i got a p027 code, then i got SES light. I did an oil change and tried to reset the oil service but it wouldnt work. After i did the oil change the car was fine. I then did the knock sensors and then got all these codes!!! The car starts and then immediately stalls. I also have a tremendous amount of lights of the dash and i cant use the odometer button (holding for 10 seconds) it will not work, i also can not press the BC button to scroll through service lights on dash! Tbh i am lost....
Codes recieved after replacing knock sensors
A6CF
93DO
9408
940A
93D1
5E3A
D359
5DD0
D36D
5F3A
5EBA
2E7C