Hi everyone,
Recently my 2003 1.0 MPI VW lupo gave me some problems, the engine started running on 3 cylinders with the consequences of the loss of power and the sh*t fuel economy
I connected the OBD2 scanner and these were the codes I found:
P0030, P0401, P0304
You know better than me what these mean.
So now I know cylinder 4 is not running, I decided to see the conditions of the spark plug and it was really wet, I switched the spark plug with one from another cylinder but the problem stayed on the fourth, so then I decided to see if there is spark and there is, guess how I know 🥲⚡. To be 100% sure I tried disconnecting the lead with the engine running and it stalled so I think it just misfires randomly. When cold started it makes a horrible noise that slowly gets quiter but doesn't disappear. Reading some data on my scanner I found that either the O2 sensor is reading and sending wrong values to the ECU or my engine is running too rich.
I don't know what else to say, please someone help me.