N43 injector coding

W111JLA · 08-14-2019, 08:22 AM

Hi everyone.

I have a 318i N43B20 engine and it misfires in the morning cold start after about 20 mins to 30 mins it then goes off, I fear this is a fuel injector issue as I've replaced the spark plugs and swapped the ignition coils and it misfired the same cylinder.

After doing a bit of digging I've heard you have to re-code the injectors if you replace them but what about if you just take one out to inspect it and put it back or swap two around? Do you need to code them then?

I'm slightly reluctant to take it to a garage immediately because they'll charge and arm and a leg prefer to know that the issue is with the injectors before I get them replaced and coded.

david in germany · 08-14-2019, 09:49 AM

Yes, you will need to code them AND replace the injector seals. My 118i also has the n43 and there was a recall done on the injectors a few years back, check with your dealer and see if your car was also on the list.

08-14-2019, 08:22 AM	#1
W111JLA New Member 0 Rep 5 Posts Drives: F30 BMW 320i M Sport xDrive Join Date: Jun 2019 Location: leeds iTrader: (0) Garage List 2013 bmw 320i xdrive [0.00]	N43 injector coding Hi everyone. I have a 318i N43B20 engine and it misfires in the morning cold start after about 20 mins to 30 mins it then goes off, I fear this is a fuel injector issue as I've replaced the spark plugs and swapped the ignition coils and it misfired the same cylinder. After doing a bit of digging I've heard you have to re-code the injectors if you replace them but what about if you just take one out to inspect it and put it back or swap two around? Do you need to code them then? I'm slightly reluctant to take it to a garage immediately because they'll charge and arm and a leg prefer to know that the issue is with the injectors before I get them replaced and coded.
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08-14-2019, 09:49 AM	#2
david in germany Lieutenant Colonel 729 Rep 1,815 Posts Drives: 118i, 335i and 328i Join Date: Nov 2011 Location: Mannheim Germany iTrader: (2)	Yes, you will need to code them AND replace the injector seals. My 118i also has the n43 and there was a recall done on the injectors a few years back, check with your dealer and see if your car was also on the list. __________________ 2009 118i Monaco Blue "Maximillion" 2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car
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