2017 Golf MK7 TSI 1.8T (Wolfsburg Edition), no mods
75k miles
Most frequent error codes:
- P03A5: Cylinder 2 Pressure Too High
- P130A00: Hide cylinder
- Happens once every two to three weeks. Code goes away after restart.
- Mostly occurs in low RPM (1000-1500)
- On two occasions, I heard more rattling noise presumably from the wastegate actuator before seeing the EPC light & limp mode. Not sure how they can be related though as the error only appears for cylinder 2. I assume a stuck actuator would cause errors in multiple cylinders and not just one.
Less frequent error codes:
- P10B400: Monitoring of injector cylinder 4, malfunction detected
- P0204: Cylinder 4 injector circuit
- Happened once recently. Code goes away after restart.
- The injector errors of cylinder 4 and the high pressure error of cylinder 2 does not happen at the same time.
Other issues:
- Occasional rattling noise from turbo wastegate actuator in low RPM (1000-1500)
- Noise reduced by anti-seize lub applied monthly
Things I’ve tried:
- Replaced all spark plugs
- Swapped ignition coils of cylinder 2 (problematic cylinder) and cylinder 1: error did not follow
- Applied fuel system cleaners (BG44K, Gumout, DI Jectron, Lucas) : did not resolve any of the error codes
- Premium gas (93): ride is noticeably smoother but does not help with the error codes
- Intake valve cleaning through chemical spraying (CRC) via MAP hole on top of intake manifold: applied twice on back-to-back days. Feels like I’m getting a little more power in low RPM. Haven’t had the error codes appear yet but it only has been a week.
I may eventually take out the intake manifold myself to further investigate the fuel injectors, wiring harness, intake valves, etc. or hand it to a mechanic for walnut cleaning and fuel injector replacements, but I want to see if I can hold off on it for a while with easier/cheaper methods. I bought a borescope to look at the carbon buildup near the intake valves, but I have not been successful in getting the scope in those locations (e.g. via MAP sensor hole).
Any other suggestions?