B58

imy · 03-02-2024, 11:59 AM

Hi all,

Hoping for some help.

My m140i (b58) recently developed a CEL. The car runs lumpy especially when cold. Even when warmed up, it hesitates a lot when cruising or giving throttle.
Sometimes it even stalls and I have to restart the car.

I had an error code for one of the lambda sensors which I changed but the issue is still there.

I am left with the error codes in the picture. I googled these but couldn't really find anything specific. Has anyone experienced this or have any ideas on where to start with this?

Thank you 👍

Aldor27 · 03-04-2024, 02:21 PM

The 21A02D is software “glitch” that can only be fixed via an ISTA update. I got mine done for $500-600 at a dealer. They locked my DME afterwards.

https://static.nhtsa.gov/odi/tsbs/20...38380-9999.pdf

DreamerJoe · 03-04-2024, 03:38 PM

Any other recent work done or modifications?

cfm56d7b · 03-04-2024, 04:54 PM

Quote:

Originally Posted by DreamerJoe

Any other recent work done or modifications?

... and how many miles?

cfm56d7b · 03-04-2024, 04:57 PM

Quote:

Originally Posted by Aldor27

The 21A02D is software “glitch” that can only be fixed via an ISTA update. I got mine done for $500-600 at a dealer. They locked my DME afterwards.

https://static.nhtsa.gov/odi/tsbs/20...38380-9999.pdf

Yes - upgrading the software is the first step.

Another possible root cause: intake vanos solenoid actuator needs to be examined and replaced.

Aldor27 · 03-05-2024, 11:41 PM

Quote:

Originally Posted by cfm56d7b

Yes - upgrading the software is the first step.

Another possible root cause: intake vanos solenoid actuator needs to be examined and replaced.

Taking it to the dealer was my last ditch effort. I replaced both vanos solenoids with the hope it would fix the issue. It didn't, the exhaust side was a pita to remove and install. The intake side was cake.

imy · 04-29-2024, 03:36 PM

Sorry for the late reply. Been trying to chase the issue.
Car has a map and downpipes but was done before I purchased.

I will be changing the vanos actuators shortly but I'm not so sure it's connected. Would that really result in fuel too lean?

I am considering the software update however not keen on it wiping my map and possibly locking the dme...

03-02-2024, 11:59 AM	#1
imy Captain 84 Rep 972 Posts Drives: M140i Join Date: Jul 2015 Location: London iTrader: (1)	B58 - 118001 and 21A02D, car runs bad Hi all, Hoping for some help. My m140i (b58) recently developed a CEL. The car runs lumpy especially when cold. Even when warmed up, it hesitates a lot when cruising or giving throttle. Sometimes it even stalls and I have to restart the car. I had an error code for one of the lambda sensors which I changed but the issue is still there. I am left with the error codes in the picture. I googled these but couldn't really find anything specific. Has anyone experienced this or have any ideas on where to start with this? Thank you 👍 Attached Images __________________ 2016 M140i 07 E90 335i: JB4, Trebila BEF, BMS DCI, VRSF DPs, Scoops, 19" CSL Reps, 5" ETS FMIC, VTT Inlets, BMS CP, HKS BOV, BMS Meth Injection - sold
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03-04-2024, 02:21 PM	#2
Aldor27 Second Lieutenant 88 Rep 284 Posts Drives: 2016 EB 340i Join Date: Feb 2018 Location: Napa Valley iTrader: (1) Garage List 2016 BMW 340i [0.00]	The 21A02D is software “glitch” that can only be fixed via an ISTA update. I got mine done for $500-600 at a dealer. They locked my DME afterwards. https://static.nhtsa.gov/odi/tsbs/20...38380-9999.pdf
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03-04-2024, 03:38 PM	#3
DreamerJoe Captain 250 Rep 784 Posts Drives: 2017 340i M.G. w red interior Join Date: Dec 2018 Location: SoCal iTrader: (0)	Any other recent work done or modifications? __________________ MG F30 M-Sport 6mt FBO w/ MHD stage 2 plus (PWG), ST XA Coilovers, 19" VMR V804.
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04-29-2024, 03:36 PM	#7
imy Captain 84 Rep 972 Posts Drives: M140i Join Date: Jul 2015 Location: London iTrader: (1)	Sorry for the late reply. Been trying to chase the issue. Car has a map and downpipes but was done before I purchased. I will be changing the vanos actuators shortly but I'm not so sure it's connected. Would that really result in fuel too lean? I am considering the software update however not keen on it wiping my map and possibly locking the dme...
	Appreciate 0 Quote