Need advice.

[MartinR86]

So I picked up a 2011 320i, 86k miles and well looked after. Had a few age related repairs to do.

Main concern is the oil light keeps coming on after a good run. The timing chain and tensioners have been replaced, gasket has been replaced and injectors replaced. Ive had the oil pressure sensor replaced as that what was initially causing the light to come on in the first place.

Anyways it came back on, does it need to be plugged into a diagnostic to have the fault code cleared or is there something else that could be potentially causing this?

[helix402]

Maybe blocked oil pick up pipe. Worn/scored main bearings. Afraid it’s an N43 which are known for their problems.

[MartinR86]

I'm hoping its an oil pump issue, hard to get it looked at over the weekend and during the week cause I work.

I've found an independent bmw specialist, ill get them to give it a look over and see what they say.

[Touring442]

Probably worn out balance shaft bearings. This can be fixed by removing the unit, chucking the balance shafts in the bin and blocking the oil feed hole before refitting the housing. The engine runs just the same as before except you'll have proper oil pressure.

[Touring442]

It's this hole that is blocked off, normally by drilling, tapping and winding a bolt in with threadlock before cutting the head off. The 1.6 N43 and N45 engines don't have balance shafts and the 2.0 runs just the same with them removed.

[MartinR86]

Well checking I've been quoted £400 for an oil pump if it is that. The guy who i bought it off is adamant he was told it was the pressure sensor that was faulty and the code just needs clearing.

I've got an oil pressure gauge kit. Im struggling to find where the oil pressure sensor is located, any ideas?