Question about 2003 Volkswagen Passat
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I have a 2003 Passat 6cyl 2.8l has a problem with misfires, Sec. Air Inj.
Sys., Bank 2 Flow too low and one Warm Up Catalyst: Bank 2: Efficiency Below
Threshold. The MIL light kept coming on and we took it to the dealer, battery
first time, 2 plug wires the second and fuel evaporator last time. Each time it
got better and then came back again. I
got the VAG software to check it myself and started getting multiple
misfires. Through different elimination
processes I ended up changing the plugs, plug wires and ignition coil. It kept coming back. Now I got the other codes P0431 and P1411
along with the misfires still. I logged some readings of the cyl misfires and oxy sen to see if the sensors are bad or if the catalylic converter is bad. How can I tell where the problem lies.
That souns like an airflow meter problem,you will need to sort the misfire out first as this will cause all sorts of fuelling issues,the secondary air flow is from the cold start pump but will only effect the emissions when cold.effiency below threshold could be the cat or rear lambda but pointless doing any further diagnostics untill the misfire has gone,check the air mass in measuring blocks or advanced measuring blocks this should give you actual and specified limits if its vag.com(vcds)
Posted on Jan 02, 2009
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Posted on Jan 02, 2017
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