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E60 525i N53 Cold Start Rough Idle - Fault Codes

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Hard to tell from picture but the lambda sensor cable suggests exhaust?

 

Or if that's a cable I guess we know where your 32amps went.

 

Edit to add if it's either exhaust or a cable I'd be very concerned indeed!

 

Edited by bmwmike

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No idea what that red thing is, looks like tape or something, very odd.

 

Since you have already replaced the injectors, it maybe worth checking if the CCV is functioning properly as these are know to cause fluctuating idle when they go bad.  A quick way to check this is to open the oil filler cap when idling there should not be much vacuum, if it's difficult to open the cap and there is a lots of suction then the CCV valve is knackered.

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These engines are not rock solid at idle in my experience. Not like m52tu/m54 anyway. With AC on and in D mine has a very slight flutter. Move it to P and AC off and it settles so that you'd almost not be able  to tell it's running. 

 

So I guess how bad is the uneven idle?  Rev needle should be rock solid and unfluctuating.

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