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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Codes 29F5, 29F4



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      07-07-2011, 07:30 PM   #1
cezary
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Codes 29F5, 29F4

I get fault codes 29F5, 29F4 every 500km after I delete them.
My car currently has 6,104km on it.
I've cleared it multiple times but they come back.
After resetting the adaptation values they came back after 180km.
I've Cleared all codes. Turned the battery off for 15min. And check all the connection but everything seems to be good.
I haven't yet pulled the O2 sensors out yet.

What available actual values should I be looking for in the BT tool to torubleshoot the problem. What voltage or other values should i be looking for to see which O2 Sensor it is or even worse which Catalytic converter it is.

Codes 29F5, 29F4 with Service Engine Soon light on.
No Warranty, I bought it on Auction it was hit in the back quarter panel.
It's a brand new car.
Thanks,
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      07-08-2011, 05:55 AM   #2
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29F4/F5

Bentley's 3-series Service manual for 06-09 shows the
29F4 (P0420) - Catalyst System Effeciency Below Threshold (Bank 1)
29F5 (P0430) - Catalyst System Effeciency Below Threshold (Bank 2)

Not sure if they are the same for your '11.

Good Luck.
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      07-08-2011, 07:19 AM   #3
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Does it say what the threshold values should be?
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      07-08-2011, 08:37 AM   #4
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Nope, no values.
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      07-08-2011, 08:44 AM   #5
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Are these codes usually because of bad catalytic converters or bad O2 sensors.
The car wasn't driven for 6 months before i bought it.
Can new catalytic converters go bad so quickly?

Last edited by cezary; 07-08-2011 at 09:16 AM.
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      07-08-2011, 09:46 AM   #6
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I guess the first thing I should to is get an emissions test done.
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      07-08-2011, 09:55 AM   #7
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I get those codes now after going catless dps. Not sure if that helps.
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      07-08-2011, 10:23 AM   #8
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Do you get the Service Engine Soon light?

Last edited by cezary; 07-08-2011 at 10:31 AM.
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      07-08-2011, 10:49 AM   #9
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If i remember correctly bank 1 is the front 3 cylinders and bank 2 is the rear 3 so this would imply that both something is not working correctly in both exhaust pipes/both cats/both O2 sensors.

Check the rear O2 sensors for both pipes as these are the ones that measure emissions.

mithiral67 will always have these codes because he has no cats...

Does the vehicle have a completely stock exhaust system?

And what do you mean when you say brand new cats? As in the car is brand new, or it has had cats replaced?
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      07-08-2011, 11:03 AM   #10
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It has a completely stock exhaust.
They were never replaced.

I check the Actual Values for
"Voltage lambda probe front catalyst 1" 1.98 V
"Voltage lambda probe front catalyst 2" 2.00 V

"Voltage lambda probe rear catalyst 1" 0.74 V
"Voltage lambda probe rear catalyst 2" 0.73 V
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Last edited by cezary; 07-08-2011 at 12:01 PM.
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      07-08-2011, 01:30 PM   #11
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Quote:
Originally Posted by cezary View Post
I get fault codes 29F5, 29F4 every 500km after I delete them.
My car currently has 6,104km on it.
I've cleared it multiple times but they come back.
After resetting the adaptation values they came back after 180km.
I've Cleared all codes. Turned the battery off for 15min. And check all the connection but everything seems to be good.
I haven't yet pulled the O2 sensors out yet.

What available actual values should I be looking for in the BT tool to torubleshoot the problem. What voltage or other values should i be looking for to see which O2 Sensor it is or even worse which Catalytic converter it is.

Codes 29F5, 29F4 with Service Engine Soon light on.
No Warranty, I bought it on Auction it was hit in the back quarter panel.
It's a brand new car.
Thanks,
No warranty? Its essentially still new?
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      07-08-2011, 02:11 PM   #12
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I don't know how BMW warranty works but I am the second owner and the car was bought from insurance auction so I am assuming that there is no warranty.
6,000 km seems almost new to me.

That's why it hard for me to believe that the cats are bad.

I know i can fix this problem myself with some help from the users on this forum.
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      08-15-2011, 09:27 AM   #13
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I changed the post-cat O2 Sensors.

I reset the light. Drove 120km. Stopped filled the tank then drove another 5km then the light turned on.

Could this error be caused the Activated carbon filter which filters the gas tank vent. It's the oldest part of the car. I installed a used on because the original was damaged when I bought the car.

The error doesn't suggest that it has anything to do with it.
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      08-15-2011, 09:34 AM   #14
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I would check with BMW first just to be sure its still under warranty and ask the dealer to work on it.

Insurance auction or not, i'm pretty sure its still covered.
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      08-15-2011, 10:40 AM   #15
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Its a Rebuilt Title.
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      08-16-2011, 06:46 AM   #16
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PM me your VIN and i'll tell you if it has warranty or not. I know a Service advisor through family he'll be able to tell me for sure if you want.
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      08-16-2011, 01:03 PM   #17
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Maybe the cats are clogged? Floor it a few times to get clean then out. If a bunch of black smoke flys out of the exhaust then you have some carbon buildup in the exhaust.
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      09-12-2011, 09:04 AM   #18
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I get these codes on my e89 N54 Z4 35i. Codes 29F4 29F5.

I have not seen a warning light on the dash/idrive and when I check the idrive it says no faults. Car drives fantastic.

I believe it could be caused by BAD FUEL since both cats give the fault code.

BTW my car is brand new - only 3500km done - so chance for BOTH cats to have gone bad at the exact same time is very slim.
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      07-13-2012, 06:01 PM   #19
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I get the same codes on my e89 35i z4,

I think it might be the E85 mix I am running.
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      08-18-2012, 09:35 PM   #20
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If you went with a catless Down pipe then you need to get the Permanent DP Fix (Simulates the cat for the car so it doesn't toss the readiness error code).

You will not be able to pass emissions test without the Permanent DP Fix. While you are at it, might as well get the JB4 at the same time to put the catless DP to good use (The install is in the same location)


JB4: http://www.burgertuning.com/jb4_pnp_...nce_tuner.html
JB4 Install Guide: http://www.burgertuning.com/instructions/JB4PnP.pdf

Permanent DP Fix: http://www.burgertuning.com/dpfix.html
DP Fix install guide: http://burgertuning.com/instructions/BMSdownpipefix.pdf
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      08-19-2012, 06:52 AM   #21
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These codes appear with no aftermarket hardware (ie downpipes). I noticed they happen only on certain brands of fuel. BP seems to be the best so far for not triggering the codes.

Again no loss of performance/idle/odd smells etc noticed.
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      10-03-2012, 11:06 PM   #22
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Anyone know the exact cause of these codes for cars without catless dp's or exhaust mods (ie stock)?
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