Low oil pressure light while idling.

Dope Earth Alien · Sep 23, 2025

Redid the valve cover seal and replaced the ignition coils on my manual transmission 2014 GLI 30th Anniversary Edition. Since then, I have been getting the error listed below when idling once the engine is warm. No power loss. All 3 oil pressure switches were replaced without improvement. Changed the oil pump (which was all gunked up). Valve cover seal redone again with anaerobic seal. Changed the oil a few times (after every 6 days of daily driving) with Liqui Moly 5W50 preceded with a 15 min Liqui Moly ProLine Engine flush. Initially, there was a layer of white material floating on top of the oil. This has since resolved and the oil is coming out clean the last 2 oil changes. I changed to a magnetic oil plug to see if it would catch anything (see pic). Likely metal shavings from somewhere. Also again changed the brown oil switch after the last oil change. One shop was telling me to replace the balance shafts, a second that I need a new engine. Can anyone think of any less costly solutions? Thank you.

OBDeleven vehicle history log
Date: 2025-07-29 17:13:45

VIN: 3VW5S7AJ4EM293399
Car: VW GLI
Year: 2014
Body type: Saloon
Engine: CPLA
Mileage: 177370 mi

---------------------------------------------------------------

Faults:
P164B00 - Oil pressure switch
Malfunction
static
Priority - 2
Malfunction frequency counter - 2
Unlearning counter - 255
km-Mileage - 285352 km
Engine speed - 2584.00 1/min
Normed load value - 40.8 %
Vehicle speed - 107 km/h
Coolant temperature - 87 °C
Intake air temperature - 51 °C
Ambient air pressure - 980 mbar
Voltage terminal 30 - 13.847 V
Dynamic environmental data - 209628110E0311EC0211DC022011ED6010A6019311EE8311DB07BD

Dope Earth Alien · Sep 23, 2025

Also replaced the PCV when I replaced the valve cover seal the first time.

RichRios · 2025-10-01T13:10:53-0400

If the oil pump was all gunked up, and the LM ProLine engine flush didn't resolve the low pressure issue, there might be more sludge lurking inside. Try doing another oil flush, maybe with Seafoam?

Dope Earth Alien · 2025-10-01T15:19:27-0400

Thank you and good idea! Will try that. Need to do a follow-up oil change after the LM flush oil change anyway. I will pick up some Seafoam today and then change the oil again in a week or so. Nothing to lose as the only other option is a new engine. Interestingly enough, changing to an OEM VW low pressure oil vs aftermarket switch decreased the frequency of the oil pressure alerts. But still happening.

Low oil pressure light while idling.

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