Hello,

 

The car in question is a december 2013 Octavia 2 FL 2.0tdi CFHC engine. On a recent vcds scan, i got 2 errors  - photos attached: Engine oil temp. Sensor P0196 00 47 - implausible signal and oil level thermal sensor B1041 35 009 - signal high time - maximum.

 

Yesterday, during the oil change, i also replaced the oil sensor with a new Hella sensor. Unfortunately, the errors are still there, after clearing and rescanning. The 5A fuse of the oil sensor circuit is fine and the connector seemed fine. I think there is a wiring issue and would like to further investigate but i do not know where the wire from the connector goes. It's about 30cm visible and after that it is hidden. Can you help me with the path of the wiring and new ideas?

 

Thank you and have a nice day.

Look for a black 6-way connector in the front left (as viewed from sitting in the car facing forward) of the engine bay.

The black/red power wire for the level/temp sensor goes to pin 4 of that connector. This one changes colour at the connection, to be black/yellow beyond.

The brown 0V wire from the sensor goes to pin 5

The grey/yellow signal wire goes to pin 6

 

I can't help with the path of the wiring between the point you can see up to , and the 6-way connector, sorry.

 

If none of that makes sense, then I probably don't have a recent enough wiring diagram to help any better.

Edited 20 November, 20196 yr by Wino

Thank you wino, will try and come back with a result in the following days, regardless of the result. 

JThank you wino, will try and come back with a result in the following days, regardless of the result. 

 

Update: a quick question:do i need to remobe the battery to get access to the connecto ? Took a quick look this morning but couldn't find the connector.

 

Thank you

Don't know, sorry.

I have found the connector but, unfortunately, everything seems fine, visually. I will try to measure the wires with a multimeter. 

 

Any other ideas in case the measures turns out fine?

Measure them for continuity end to end with the 6-way and sensor plugs disconnected, then measure each to each of the others (for wire-to-wire shorts, unlikely but possible), then from each to chassis (more likely, but can be intermittent so tricky to spot).  

I seem to recall someone on here finding a bit where the loom had crossed some suspension or steering rack metalwork or some such and had chafed through to bare wire.  Can't remember which model of Skoda unfortunately.

 

If that all checks out OK, I can tell you where they go after the 6-way.

Maybe it's a stupid question, but the the male part of the connector comes from the sensor right?

Ok, so measured the wires today, it seems that i have no voltage on the power wire but the connector from the engine bay an the one from the sensor seem good. I guess i should check the integrity of the wires underneath the car but i don't know the route.

22 hours ago, Mircae said:

Maybe it's a stupid question, but the the male part of the connector comes from the sensor right?

Not sure, the section going to the sensor has the black/red power wire, instead of the black/yellow, which goes back all the way to a connection in the interior wiring harness, then continues to cabin fuse no.4 still as black/yellow.

 

Two questions:

Was the ignition switched on when you were testing for voltage on that wire? (It needs to be).

Have you definitely checked the correct fuse? (Third one from the left, top row, if your car is RHD, fourth from the left if LHD)

 

Ok so bear with me, i am an absolute incompetent when it comes to electrics and measuremenrs. Maybe i measured using the wrong methods:

 

First time, i measured  with the contact off and also tried after with it on. The way i measured was:

 

For power wire: measured between the wire and the - of the battery

 

For ground: measured between the wire and the + of the battery, got 7V

 

For continuity i unclipped the connector and measured between the pin in the male and the one in the female. I'm pretty sure this method for continuity is wrong because the multimeter didn't beep for any of the 6 pairs of wires.

Sorry, forgot to answer the question regarding the fuse: yes, the fuse is fine.

I will draw you a little picture later to show you what I would do.

The very simplest check of power is to measure voltage with everything connected normally except the 3-pin connector for the sensor. Switch  on ignition and then measure between the pins that the black/red wire, and brown wire are connected to; pins 1 and 2 respectively. If this reads approx. 12V then you have checked both power and earth wires.

Does the level sensor go through the bonnet catch like it does with my C6? It’s so it senses you’ve opened the bonnet to check the level of the oil before trying to cancel the dash message.

I don'y have any dash messages/MILs. The errors appear only when scanning with vcds.