Check Engine light came on while idle in a parking lot…I turned off my car with no light when i turned it back on check engine light turned on too. Very next morning showed only p0171 then after getting back from mechanic with no leaks, changed spark plugs and both front o2 sensors both p0171 and p0174 now.

I Didn't turn it back on for 2 days and it misfires on startup. Took to infiniti dealership and they said its a front o2 sensor… which i changed already. They refused to do any further inspection till that was changed I obviously didnt do that again and even switched the new o2 sensor with the warranty and now car wont stay running at all. last time it was on driving was from the dealership back home felt like the car was stuck in first gear and wanted to turn off

Car starts up then about .5-2 seconds rpm start dancing between 500 -300 and hearing knocking sound when it goes down to 300, all while battery and Brake lights flash simultaneously then car dies and the SES, brake, oil & battery light stay on