[LaFuriaRoja]

Hi guys

I think the injector(s) on bank 1 of my 335i have gone. The codes suggest it's injector 1. Engine management light has come on and it misfires, even though it's ever so slight. Narrowed it down to injectors as the spark plugs and coil packs have been changed a few months ago.

I also got a code for bad oxygen sensor(s) on bank 1. I know a bad oxygen sensor won't cause the misfire, but I think the misfire may be damaging the oxygen sensor.

3 questions:

1) Is it worth getting the injectors cleaned instead of replacing them?

2) Would all 3 injectors on bank 1 need changing, or could I get away with just changing the 1 bad injector? I've read some things which suggest that mixing newer injectors with older injectors wouldn't allow them to work, but what if I installed the older version of the injectors, to match the ones already used, considering I've done 70K miles on originals anyway.

3) About the oxygen sensor, would it worth getting it cleaned, or is replacement necessary?

Any help/advice will be much appreciated.

[dghits26]

i would change them all. save yourself the headache later down the line.

[timsev]

The newer part #'s cannot be mixed with old injectors. You need to change the whole bank and get the car coded for the new injectors. Don't waste your time cleaning. It's not worth the trouble for the downtime, and it may or may not fix your issue.

Don't be so quick to change the O2 sensor. A code could also mean that the O2 sensor is working and detecting a problem with air/fuel. Fix the misfire first, then go down the line.

[Blackhawk36]

A bad O2 sensor can absolutely cause a misfire. Usually random though, not just on one specific cylinder. Don't clean it. Replace it.