Hi there,

 

I'm currently trying to solve a bit of an enigma―evolving around my 2009 Octavia Mk2―I'd like to share with you. The car is with 1.8TSI 118kW engine and 7-speed DSG gearbox (DQ200), currently around 110,000 km (68,000 miles) covered.

 

So the day before yesterday, while stopping at a read light (had already driven 20+ km), the red oil pressure warning light comes on (+ STOP ENGINE on the MFD accompanied by the horrible sound). Didn't hear any noises or feel anything out of ordinary before shutting down the engine. I checked the oil level, which appeared perfectly fine, and took the car to the service where the oil pressure was checked with a gauge (both on load and idle) - which was totally fine. OK, probably a faulty pressure switch, so I had that changed. Yesterday I collected my car and everything seemed fine for a few km, but then I stopped at a red light and the oil pressure warning light came on again. Before I could do anything, the light was off again and everything seemed normal. I had several several similar incidents that day - the red warning light going on 1-2 seconds after stopping the car and then going off again shortly after that. I also tried turning off and on the engine, which resulted in similar response - the warning light with the sound coming on for a moment and then going off again. Additionally, it only seemed to be occurring with a warm engine. Once the engine had cooled off and I started the engine, the warning light did not appear. However, today I started the car and drove around for a few hours (stopping multiple times along the way), but not a single time the light came on. Which is especially confusing (but somewhat comforting nonetheless).

 

The weather during the past few days has been significantly colder than before - currently around -5C. So I'm thinking maybe it's the cold that's affecting the switch and somehow making it send false positive signals on borderline cases? Or maybe the oil pressure actually does shortly drop after stopping the car (sadly I know nothing about oil pressure dynamics during engine operation)? If so, what the hell is causing it? Maybe the oil has thickened because of the cold temperatures? If so, why didn't it happen today? Or why does it happen only when the engine is warm?

 

I have read several threads on oil pressure failures, but haven't thus far found anything matching my peculiar case. Maybe someone has had similar issues or can give any hints on what to look for? Any help is really appreciated!

 

Cheers!

 

It may not prove anything, but get the fault codes read.

 

Also check the plug on the pressure transducer for signs of corrosion, and the wires for breaks where they're visible.

 

Basically, I'm trying to think of things that throw a false sensor reading that aren't a FUBAR sensor.

Read this thread...

 

http://www.briskoda.net/forums/topic/351629-18tsi-advice-if-you-have-it/

 

Anything oil or oil pressure related on the 1.8 TSI would make me extremely nervous.

 

Check this thread out too...

 

http://www.briskoda.net/forums/topic/266114-18tsi-and-20tsi-engine-failures/

Thanks. Here's an update. This is my 5th day without any warning lights (yay!). I haven't had chance to check the wiring (it's still bloody cold outside), but I did have the fault codes read.

 

So I here are the results (addresses without fault codes have been removed and the timestamps are off):

 

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

Address 01: Engine (CDA)       Labels: 06J-907-115-CDA.clb

   Part No SW: 3T0 907 115 G    HW: 1Z0 907 115 F

   Component: 1.8l R4/4V TFSI     0030  

   Revision: AAH03---    Serial number:               

   Coding: 0203000C24070160

   Shop #: WSC 24480 001 1048576

   VCID: 3561C75F5CB4ADB6775-8060

 

2 Faults Found:

000545 - Angle Sensor 2 for Throttle (G188) 

               P0221 - 000 - Implausible Signal - Intermittent

             Freeze Frame:

                    Fault Status: 00100000

                    Fault Priority: 0

                    Fault Frequency: 1

                    Reset counter: 255

                    Mileage: 110052 km

                    Time Indication: 0

                    Date: 2012.14.09

                    Time: 11:51:20

 

             Freeze Frame:

                    RPM: 1711 /min

                    Load: 29.4 %

                    Speed: 77.0 km/h

                    Temperature: 90.0°C

                    Temperature: 4.0°C

                    Absolute Pres.: 1010.0 mbar

                    Voltage: 14.224 V

 

005709 - Oil Pressure Switch for reduced Oil Pressure 

               P164D - 000 - Malfunction - Intermittent

             Freeze Frame:

                    Fault Status: 00100000

                    Fault Priority: 0

                    Fault Frequency: 20

                    Reset counter: 255

                    Mileage: 110104 km

                    Time Indication: 0

                    Date: 2012.14.10

                    Time: 15:57:51

 

             Freeze Frame:

                    RPM: 761 /min

                    Load: 12.5 %

                    Speed: 0.0 km/h

                    Temperature: 88.0°C

                    Temperature: 7.0°C

                    Absolute Pres.: 1030.0 mbar

                    Voltage: 14.224 V

 

Readiness: 0000 0000

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

Address 03: ABS Brakes (-----)       Labels: 1K0-907-379-60EC1F.clb

   Part No SW: 1K0 907 379 AE    HW: 1K0 907 379 AE

   Component: ESP MK60EC1   H35 0106  

   Revision: 00H35001    

   Coding: 113B401C09220003880C02E890210041E900

   Shop #: WSC 73430 790 00000

   VCID: 75E1075FDC34EDB6B75-8020

 

1 Fault Found:

01314 - Engine Control Module 

            013 - Check DTC Memory - Intermittent

             Freeze Frame:

                    Fault Status: 00101101

                    Fault Priority: 2

                    Fault Frequency: 1

                    Reset counter: 226

                    Mileage: 110052 km

                    Time Indication: 0

                    Date: 2012.14.09

                    Time: 11:51:21

 

             Freeze Frame:

                    Count: 0

                    Count: 32768

                    Count: 4608

                    Count: 8193

                    Count: 51789

                    Count: 2

                    Count: 0

                    Count: 0

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

Address 09: Cent. Elect. (J519)       Labels: 1K0-937-08x-09.clb

   Part No SW: 1K0 937 087     HW: 1K0 937 087 

   Component: BCM PQ35  H   020 0358  

   Revision: 00020000    

   Coding: 40180AB8D041B1C040080080110001E4057000AE62208D605C0440000000

   Shop #: WSC 73430 790 00000

   VCID: EED3A83339625E6EF6F-80BB

 

   Subsystem 1 - Part No: 1Z1 955 119 C  Labels: 1KX-955-119.CLB

   Component: Wischer 09100  22  0601 

   Coding: 00D7B7

 

   Subsystem 2 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB

   Component: RLS 080713 05  54  0403 

   Coding: 0330AD

 

   Subsystem 3 - Part No: 1Z0 951 171 A

   Component: Innenraumuebe  009 5103 

 

   Subsystem 4 - Part No: 1K0 951 605 C

   Component: LIN BACKUP HO  H05 1501 

 

1 Fault Found:

00446 - Function Limitation due to Under-Voltage 

            002 - Lower Limit Exceeded - Intermittent

             Freeze Frame:

                    Fault Status: 00100010

                    Fault Priority: 6

                    Fault Frequency: 1

                    Reset counter: 234

                    Mileage: 110251 km

                    Time Indication: 0

                    Date: 2012.14.16

                    Time: 14:19:50

 

             Freeze Frame:

                        Term 15 On

                    Voltage: 10.70 V

                        ON

                        ON

                        Term 50 On

                        ON

                        OFF

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

 

Digging in now.