VAG-COM error detection

[dub6n2]

Hi, I have just scanned my polo with vag-com and under the engine module it found an error described as 'Random/Multiple Cylinder Misfire Detected' . Has anyone ever had this problem? What is the cause? HT leads maybe? Spark plugs are new so they are not the problem. tks . BTW does the software need to be registered to properly work?

[emma_88]

Hey up,

Yeah the most common cause of a misfire is the HT leads.. I also found this on the Ross-Tech Wiki website..

16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected
Possible Causes
Air Intake System leaking
Fuel Supply faulty
Injector(s) faulty
Ignition Cable(s) and/or Spark Plug(s) faulty
Ignition Coil(s) faulty
Exhaust Gas Recirculation (EGR) Valve (N18) stuck/open
Camshaft Position Sensor (G40) faulty
Possible Solutions
Check Misfire Recognition
Check Air Intake System
Check Fuel Supply
Check Injector(s) and Injector Sealing
Check Ignition Cable(s) and Spark Plug(s)
Check Ignition Coil(s)
Check Exhaust Gas Recirculation (EGR) Valve (N18)
Check Camshaft Position Sensor (G40)
Special Notes
This DTC indicates that one or multiple cylinders are misfiring, but the ECU fails to identify the cylinder.

And yes, you need a registered version of vag-com for it fully work properly.

[dub6n2]

ouchhh that's a very long list to trouble shoot!! I'll have a go with the HT leads first then. Tks very much for your reply

[dub6n2]

OK just narrowed down the problem to code 16685 which is "Cylinder 1 burn misfire recognized". Just to make sure cylinder one is the one on the left, looking from the front?

[emma_88]

OK just narrowed down the problem to code 16685 which is "Cylinder 1 burn misfire recognized". Just to make sure cylinder one is the one on the left, looking from the front?

Correctamundo. Cylinder 1-4 from left to right

So just go to VW or GSF and ask for the HT lead for cylinder one