u/AthleteNew6832

Hello. So my 2011 audi a3 has started to misfire during engine warm up, specifically at around 45-70°c and its at its worst at 60°c. Also i have noticed trough veds logging that the misfiring starts exactly when lambda control comes active, so when it switches to closed loop operation? On startup it starts perfect and idle is stable when I start to drive it shows 0-2 misfires per 1000 revolutions then when lambda control comes active it shows 20-30 misfires per 1000 revolutions then at 60°c it might go as high as 70 per 1k revolutions and afterwards the number starts dropping and upon reaching operating temp its at 0-3 misfires per 1k also if I continue to drive like 10mins on a warm engine the misfires disappear completely. Cylinder two is the worst but the other three might show a misfire amount of 0-3 sometimes during warm up. The engine is the 1.4tfsi at 187k kms and i already have switched ignition coils and spark plugs around different cylinders but it didn't help. The misfires lessen under light acceleration and never ever happen on idle speed. The car has never shown me the check engine light, it only triggers p0300 and p0302 maybe 1 out of 4 days. I have been monitoring oil and coolant levels and neither have dropped at all. What should i do or check next?

Hello. So my 2011 audi a3 has started to misfire during engine warm up, specifically at around 45-70°c and its at its worst at 60°c. Also i have noticed trough vcds logging that the misfiring starts exactly when lambda control comes active, so when it switches to closed loop operation? On startup it starts perfect and idle is stable when I start to drive it shows 0-2 misfires per 1000 revolutions then when lambda control comes active it shows 20-30 misfires per 1000 revolutions then at 60°c it might go as high as 70 per 1k revolutions and afterwards the number starts dropping and upon reaching operating temp its at 0-3 misfires per 1k also if I continue to drive like 10mins on a warm engine the misfires disappear completely. Cylinder two is the worst but the other three might show a misfire amount of 0-3 sometimes during warm up. The engine is the 1.4tfsi at 187k kms and i already have switched ignition coils and spark plugs around different cylinders but it didn’t help. The misfires lessen under light acceleration and never ever happen on idle speed. The car has never shown me the check engine light, it only triggers p0300 and p0302 maybe 1 out of 4 days. What should i do or check next? Also I have been monitoring oil and coolant levels and neither have dropped at all.

Hello everyone. So i just changed the battery on my 2011 audi a3 and was wondering if I did the BMS reset correctly. The old coding was 068 VA0 0670620250 Format: AAA BBB NNNNNNNNNN

AAA = Battery Size (e.g. 68 Ah = 068 / 3 Digits)

BBB = Battery Vendor (3 Digits)

NNNNNNNNN - Battery Serial Number (10 Alphanumeric Digits)(copied from vcds)

I only changed the first three digits to 070 and from the serial number I changed the last number from 0 to a 1. New battery was a 70Ah varta so I think i got the first part right but I didn’t buy the battery from Audi so I didn’t get the bem code so I don’t know the correct serial number for it. Was changing the 0 to a 1 enough to get the bms to reset or should i have done something else? Everything works correctly and there’s no codes saved after a test drive