[kern417]

Making this thread to hold a series of videos I'm making in regards to common B58 issues. Click on the respective links to go straight to the post with the video. If you have any particular requests, please list them below

Youtube Playlist:
https://www.youtube.com/playlist?lis...aDh_Jmy5UAHeOn



20A201 Charge air, cooling system: Dry-running detected - Post
20E120 Crankcase Ventilation Hose Disconnected - Post
CDB309 - Post
A/C Blowing Warm - Post
Cam Ledge Broken - Post
"HPFP Crashing" - Post
Injectors - Post
Low Coolant Warning - Post
O2 Sensor Issues - Post

Hope this helps!

[kern417]

20E120 Crankcase Ventilation Hose Disconnected

[kern417]

Low Coolant Warning

[luca10]

Subscribed 👍🏽 is it a common issue to get the emergency call malfunction code or is that only me?

[F30REAPER]

I follow you on YouTube man. Super great, and more importantly, relevant content. Thanks for all that you do and keep it all coming!

[cfm56d7b]

Subscribed. Nice videos!

[MTWO]

Sub

[jackstrath]

Originally Posted by luca10

Subscribed 👍🏽 is it a common issue to get the emergency call malfunction code or is that only me?

Not really a B58 issue

[kern417]

Originally Posted by luca10

Subscribed 👍🏽 is it a common issue to get the emergency call malfunction code or is that only me?

Not something I'll be covering in this group of videos but I've heard of it on BMW before. Search around, even on e-series forums to see how people are fixing it.

[luca10]

Originally Posted by kern417

Not something I'll be covering in this group of videos but I've heard of it on BMW before. Search around, even on e-series forums to see how people are fixing it.

Will do thanks

[kern417]

20A201 Charge air, cooling system: Dry-running detected

[BMWILUVU]

Originally Posted by kern417

20E120 Crankcase Ventilation Hose Disconnected

It looks like the flimsy diaphragm is the control valve and also governs the non-return to the intake and combustion chamber. I don't see any other part which could be the non-return valves. So if you replace it with a breather, aren't you introducing lean conditions into combustion?

[kern417]

Originally Posted by BMWILUVU

It looks like the flimsy diaphragm is the control valve and also governs the non-return to the intake and combustion chamber. I don't see any other part which could be the non-return valves. So if you replace it with a breather, aren't you introducing lean conditions into combustion?

It always recirculates. If it's not going back to the intake, it's recirculating back down the cylinder head. As long as the recirculating portion is blocked off, then it won't cause any issues with air metering.

[kern417]

"HPFP Crashing" or Rail Pressure Dipping

[john_f30]

Subscribed. Thanks!

[kern417]

Failed O2 sensors

[BMWILUVU]

Originally Posted by kern417

Failed O2 sensors

I woud like to know where you have the reference information that the downstream sensor is at all used to adjust AFR. If this is true, all with catless are in trouble.

[kern417]

Originally Posted by BMWILUVU

I woud like to know where you have the reference information that the downstream sensor is at all used to adjust AFR. If this is true, all with catless are in trouble.

I'll see what I can find, but it has been confirmed for some time now. Search around and see for yourself. It affects fuel trims.

If you have a catless downpipe then it's not typically an issue, because the car can adjust accordingly. But it can still throw a CEL if you're not tuned.

[BMWILUVU]

Originally Posted by kern417

I'll see what I can find, but it has been confirmed for some time now. Search around and see for yourself. It affects fuel trims.

If you have a catless downpipe then it's not typically an issue, because the car can adjust accordingly. But it can still throw a CEL if you're not tuned.

I've looked around and ISTA explicitly says the secondary O2 has no role in AFR. From an engineering perspective, you do not want a secondary O2 fail to affect AFR as well since its primarily monitoring catalyst O2 capacitance. If it has some minor role, it would be good to know what its exact role is pertaining to AFR as secondary O2 are neg'ed or messed with by many catless users.

[kern417]

Originally Posted by BMWILUVU

I've looked around and ISTA explicitly says the secondary O2 has no role in AFR. From an engineering perspective, you do not want a secondary O2 fail to affect AFR as well since its primarily monitoring catalyst O2 capacitance. If it has some minor role, it would be good to know what its exact role is pertaining to AFR as secondary O2 are neg'ed or messed with by many catless users.

Like I said, it still throws a CEL if it's bad. Search around for how secondary 02 controls fuel trims to keep fueling in check.

[Skyhigh]

The secondary O2 is typically just a cat-function check and therefore often a simplified (cheaper) variant.

It should NOT have any effect on the engine, although it throws a CEL (bad emissions or lack of emissions control is per definition a CEL event). Not every CEL event has an impact on the engine.

[kern417]

Originally Posted by Skyhigh

The secondary O2 is typically just a cat-function check and therefore often a simplified (cheaper) variant.

It should NOT have any effect on the engine, although it throws a CEL (bad emissions or lack of emissions control is per definition a CEL event). Not every CEL event has an impact on the engine.

You guys can believe what you want, but there are plenty of discussions around the secondary O2 controlling fuel trims. Here are a bunch of threads discussing the topic across various platforms. Again, feel free to do your own research and search around.

https://www.e90post.com/forums/showthread.php?t=930267
https://www.bimmerforums.com/forum/s...fect-fuel-trim
https://www.m5board.com/threads/func...ensors.162711/