E92 320i n43 code 29CD

kaieversden · 02-18-2026, 10:13 AM

Bought this 320i with the n43 engine from a friend for super cheap knowing it had a misfire problem which only happens under load and at medium to full throttle. I started with replacing ignition coils and spark plugs which I thought fixed it cuz wasn’t misfiring anymore for about 200-300 miles then came back so scanned the codes which was 29CD on cylinder 1, I’m going to switch injectors from 1 and 2 and see if it moves just waiting for seals and decouples to be delivered. I have read these engines have bad injectors I just wanna know is there a good aftermarket option or can I buy used refurbished ones and do I have to only replace cylinder 1 or am I going to have to do all 4.

Bony6777 · 03-12-2026, 04:55 PM

You can do only 1, but better to do at least in pairs. I would not recommend to go for second hand as you don't know how good they are. I recently replaced 2 for 2 brand new ones. New from BMW is 600£. I brought Continental (Vitesco) brand new injectors for 260 each while they were on sale, now they for 354£. Already did over 1k miles and all good.

02-18-2026, 10:13 AM	#1
kaieversden Registered 0 Rep 1 Posts Drives: e92 2008 320i Join Date: Feb 2026 Location: Suffolk iTrader: (0)	E92 320i n43 code 29CD Bought this 320i with the n43 engine from a friend for super cheap knowing it had a misfire problem which only happens under load and at medium to full throttle. I started with replacing ignition coils and spark plugs which I thought fixed it cuz wasn’t misfiring anymore for about 200-300 miles then came back so scanned the codes which was 29CD on cylinder 1, I’m going to switch injectors from 1 and 2 and see if it moves just waiting for seals and decouples to be delivered. I have read these engines have bad injectors I just wanna know is there a good aftermarket option or can I buy used refurbished ones and do I have to only replace cylinder 1 or am I going to have to do all 4.
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03-12-2026, 04:55 PM	#2
Bony6777 New Member 9 Rep 11 Posts Drives: E90 Join Date: Feb 2026 Location: London iTrader: (0)	You can do only 1, but better to do at least in pairs. I would not recommend to go for second hand as you don't know how good they are. I recently replaced 2 for 2 brand new ones. New from BMW is 600£. I brought Continental (Vitesco) brand new injectors for 260 each while they were on sale, now they for 354£. Already did over 1k miles and all good.
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