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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

TFSI engine GEN 3, check engine, misfire between 3000 ~ 4000 RPM.

  • georges92
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2 years 3 months ago #61774 by georges92
Hello, my name is George, I'm from Moldova, sorry for my bad English, I need your help, I own a European model car "Skoda Octavia", production year 2014, engine 1.8 TFSI GEN3, code "CJSB", AWD, gearbox DSG DQ-250, I can't find the solution to my problem for almost a year. The problem appears mostly in the "Sport" or "Tronic" driving style, accelerating slowly, most often between 3000-4000 RPM, the car starts to vibrate and loses power, after restart ignition check engine disappears until the following conditions are repeated, fixing the following errors:
P030300 Cyl.3 Misfire Detected
P030200 Cyl.2 Misfire Detected
Sometimes these are fixed :
P039B00 Cylinder 1 Pressure Too High
P03B900 Cylinder 4 Pressure Too High
P233800 Cylinder #3 Above Knock Threshold
P233900 Cylinder #4 Above Knock Threshold.
How could I understand the error with too high pressure? physically it is not a pressure sensor in the cylinders. Most often is fixed misfire on cyl. 2 & 3. I changed almost half of this engine but without success. I went to the dealer with this problem, but this did not give anything positive result, I even replaced the cylinder head and engine wiring harness with their recommendation. What I have already discovered by testing the car in different driving styles, "short term adaptation" is mostly has a negative value as well as "long term adaptation", and close to the moment when it fixes misfire these values ​​exceed -26 % on "short & long term adaptation" and a different engine sound is heard. I replaced new magnets N205 & N318 for camshaft control valve, all the injectors TSI + MPI, the high pressure pump, all exhaust valve lift and many more parts but is the same issue. The only method I discovered to make this problem disappear is to unplug connector from magnet camshaft control valve (N205 or N318). I also checked the oil pressure, it is fine in both working stages, from what I understand this problem can be caused by timing issue, I replaced the distribution chain same result. I recorded my screen values if this is needed I can upload. Help me please to solve this problem, I appreciate every answer, thanks. :)
@Tom Wolfe from "Positive Lead Diagnostics" maybe you can help me, given your experience on VAG model cars.

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9 months 2 weeks ago #67912 by sompse
Hello

Old story, but i have GEN3 and done pretty much same as you but still similar misfire issues. Did you find root cause ever?

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5 months 1 week ago #86828 by sompse
Has anyone info about this case, was it fixed somehow?

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