Help me with my first code please 2b42

[Time Lord]

code details

misfire with emissions deterioration cyl 1/ engine misfire with emissions deterioration cyl 1

code 2b42

I get an occasional hesitation, like a misfire. ordered new plugs, you guys think i need a new coil?

i was going to get in there and switch coils to see if it follows. any other help is appreciated.

[stevens]

I dont know tbh but looking at the sticky above:

2B41 - P0300 (one less)

http://www.m3post.com/forums/showpos...8&postcount=29

2B41 - P0300
Information saved in DME
Fault code 2B41 - P0300
Fault text Misfire with cutout, several cylinders
Fault description Random/Multiple Cylinder Misfire Detected
Condition for fault identification Test condition: Miss capable of damaging cat on multiple cylinders
Terminal condition: Terminal 15
Voltage condition: none
Condition for fault memory entry Varies according to load and rpm
Action in service Note selective logged error codes related to individual cylinders
Fault effect and breakdown warning CC message
Engine speed limited
Reduced power
MIL after engine runs 2x
Rough idle
Driver information Warning light: MIL, EML, CC message, backup program
Service instruction None

[Time Lord]

engine runs perfect just get a slight hiccup sometimes. like a coil/plug is bad

[stevens]

ok perhaps attempt2 simple google:

2B42 Combustion misfire with emissions deterioration cyl 1

if its just 1 cylinder could be spark, if multiple could be ICV (inlet control valve).

but ill let the more experienced members confirm/deny.

[stevens]

could also be injector if one cylinder.

[regular guy]

2B42 - P0301, Post-33

It looks like P0301 maps to multiple BMW codes. That makes sense because I would expect BMW codes to be more specific than a generic "misfire cylinder 1" P0301 error.

2B42 - P0301
Information saved in	DME
Fault code	2B42 - P0301
Fault text	Misfire impairing exhaust emission, cyl. 1
Fault description	Cylinder 1 Misfire Detected
Condition for fault identification	Test condition: No spark detected in ionic current signal
	Terminal condition: Terminal 15
	Voltage condition: none
Condition for fault memory entry	Varies according to load and rpm
Action in service	1. Check spark plug, interchange with other plug or replace to localize fault
	2. Exchange ignition coil with another coil to localize fault, replace as indicated.
	3. Check plug and wiring harness to ignition coil.
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
	Rough idle
Driver information	Warning light: MIL
Service instruction	None

[Time Lord]

changing out coil and plug tomorrow. ill keep you guys updated

[BPMSport]

Originally Posted by Giorgia

changing out coil and plug tomorrow. ill keep you guys updated

I would first move the coil to see if the fault moves.

[Time Lord]

Originally Posted by Mike Benvo

I would first move the coil to see if the fault moves.

Okay so i moved the coil and also inspected the spark plug. i really dont know what im looking at anyway lol. So i turned the car and and checked for any codes and nothing was present

When i removed the coil it was on there tight and the spark plug also, so there wasent anything loose that i could see. im going to assume the coil is going bad but why would it work in anther port....... anyway im going to change all the plugs and replace that coil.

Anyway lets see if anything comes back

I should have added that no codes came up on the car itself. i ran the BMWHAT APP with the bluetooth scanner and it found it. was also able to code the car. thing is awesome

[Time Lord]

drove around all day with no codes or hesitations/misfires. im going to go ahead and change the plugs and that one coil anyway. So we now know that code is either a coil or plug and nothing else.

[///mawana]

See this thread http://www.m3post.com/forums/showthr...=ignition+coil.

Just do the plugs, I wouldn't bother with the coil as it should throw its own specific code - at least that was the case for me when coil #8 went and I used the above thread as reference.

[Time Lord]

Originally Posted by ///mawana

See this thread http://www.m3post.com/forums/showthr...=ignition+coil.

Just do the plugs, I wouldn't bother with the coil as it should throw its own specific code - at least that was the case for me when coil #8 went and I used the above thread as reference.

Nice!!! thanks for posting that.

[///mawana]

Originally Posted by Giorgia

Nice!!! thanks for posting that. guess my code could be just the spark plug then.

If you are over 37k miles on the same plugs, most likely they are the culprit.

[Time Lord]

So all my parts came in and for some reason i decide to check the glove compartment and i find all the service history........

So look what i find.... my code said cyl. 1 misfire because the dealer took it out of 2 and put it in one to see if the problem followed hahahhaah. so it turned out to be a failing coil. All the spark plugs were just replaced.

Spark plugs will go for sale lol. can belive the lazy dealer didnt just change that coil.....

[MilehighM3]

Apparently the fault never returned after they replaced the spark plugs and swapped them at the same time. The customer never brought the car back for the warning, and them appears to have sold it. Unless you just don't remember having the issue with your own car, but that doesn't seem to be the case. Ironically this appears to be the same diagnostic path you were going to take here. Speaking of lazy, who isn't familiar with their own service history?

[Time Lord]

Originally Posted by MilehighM3

Apparently the fault never returned after they replaced the spark plugs and swapped them at the same time. The customer never brought the car back for the warning, and them appears to have sold it. Unless you just don't remember having the issue with your own car, but that doesn't seem to be the case. Ironically this appears to be the same diagnostic path you were going to take here. Speaking of lazy, who isn't familiar with their own service history?

Word