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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > 2C3D and 30F1 Codes



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      03-29-2021, 01:11 PM   #1
Willygbr66
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Drives: E92 335i M Sport
Join Date: Jun 2020
Location: Essex

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2C3D and 30F1 Codes

Just done replacing a leaky injector on cylinder 1 today. Fitting a second hand index 11 was a breeze following some great advice on this forum. Also replaced all spark plugs as a maintenance precaution. A few things I have noticed.

Firstly my other injectors are index 9 and the one I replaced was index 3 which I found very strange.

Secondly on scanning for codes I have a 2C3D code come up on MHD and the yellow CEL lights up. On searching the internet I am unsure on where to go with this. I previously had a JB4 which I uninstalled to go directly to MHD. I have previously also done a valve cover gasket replacement which I know I snagged the bank 1 lambda sensor cable when replacing though this code never showed until now. On checking my AFR’s, bank 1 definitely seems the issue as it rises to 26 whilst bank 2 is steady at 14. Am contemplating whether to replace the sensor.

Lastly on low rpm to wot I had a slight shudder on acceleration and again reading the codes I have a 30F1 in cylinder 5. This has scared me a little as it’s a super knocking code. Never had this before. Wondering if I may have a dodgy spark plug. I am hesitant to run the car at wot again until I can gather further information.

Any advice/suggestions, ways forward would be much appreciated as always.
Appreciate 0
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