Hi everyone,

I'm struggling with a persistent but intermittent issue on my 2018 Skoda Superb (1.8 TSI). I would appreciate some expert insight before I spend more money on unnecessary parts.

The Symptom:

Randomly, I get the orange "Oil Sensor: Service Vehicle" warning with a beep.

What I've observed (The "Smoking Gun"):

I’ve been monitoring the Oil Temperature on the Maxi-Dot display.

• When everything is fine: Oil temperature reads normally (between 96° and 104°).

• When the warning pops up: The oil temperature immediately disappears and shows three dashes (---).

• After a while (sometimes minutes, sometimes days), the warning disappears and the temperature reading returns.

What has been checked/done:

1. Sensor: The oil level/temp sensor has been replaced twice with a Genuine OEM sensor.

2. Oil Level: Manually checked via dipstick, it is at the MAX line.

3. Hood Latch Sensor: Confirmed working (I get the "Hood Open" notification on the dashboard).

Since the oil temperature vanishes exactly when the error occurs, I suspect a wiring harness issue or a loose pin in the connector rather than a faulty sensor.

Has anyone encountered this specific behavior? Are there known "rub points" in the wiring loom for the 1.8 TSI engine that could cause such an intermittent communication drop?

I am attaching two photos: one showing the normal temp reading and one showing the "---" with the warning light.

Thanks in advance!

Edited 2 January2 Jan by AviWrx

How old is the battery?

11 hours ago, AviWrx said:

Oil Sensor: Service Vehicle"

How old is the oil?

22 hours ago, defsix said:

How old is the battery?

Battery replaced by previous owner in January 2025

16 hours ago, BlueWagon said:

How old is the oil?

Oil changed in September 2025

Id be going down a diagnostic route. Check fault codes and report. May give an indication if it's a decide fault, wiring issue or something else causing it.

Have you added anything or changed anything on the car recently? Bulbs etc.

12 hours ago, defsix said:

Id be going down a diagnostic route. Check fault codes and report. May give an indication if it's a decide fault, wiring issue or something else causing it.

Have you added anything or changed anything on the car recently? Bulbs etc.

I will be at the garage again tomorrow and ask them to scan the fault codes again if there are any.

And I haven't changed anything in the car.