Oil Pressure Light On? Check Oil Level & Sensor

Hello,

I drive a Seat Toledo 1M PD with 81 kW (85,162 km). Since the last oil change, the oil warning light has been acting up. I've been to the workshop three times already, but they supposedly can't find any errors anymore. The oil pressure sensor has already been replaced.
As soon as the engine warms up and I reach the (magical) speed of 1500 RPM, it starts blinking and beeping. If I go above or below that speed, everything is okay.
Oil level is also okay.

Does anyone have a guess or know of a solution?

Regards,
Andy.

Such an engine has multiple oil pressure sensors for different engine speeds.

The first gear (with low pressure, e.g., 0.6 bar) needs to be shifted even at idle speed, which seems to be working for you.

The second one (for slightly more pressure, e.g., 0.8 bar) needs to switch at a slightly higher RPM (e.g., 1500...). That's likely where your problem lies. Your engine only reaches the 0.8 bar mentioned in the example at, for example, 1550 RPM. Therefore, the control unit detects that between 1500 and 1550 RPM, the required 0.8 bar of oil pressure is not present.

The cause could be oil that is too thick, which should be noticeable especially during cold starts. Another possibility is a blockage in the oil circulation system. Was the filter changed? (It should be, but you never know...) Were ALL the oil pressure sensors replaced, or at least the one for 1500 RPM, or was ANY oil pressure sensor replaced...? (That would be typical of a VW/Seat workshop...)

Since the problem started exactly after the last oil change, a faulty switch is less likely than improper work during the oil change or even the wrong type of oil. The PD system has relatively high requirements in that regard...

PS: The numerical values provided are only examples and should be understood as such. I'm not sure where those values apply to your specific engine.

Regards,
Private.

Hi,

I don't know about a PD-TDI with 81 kW!

Furthermore, at least the ALH, ASV, AJM, and ATD engines only have one oil pressure switch.

However, the alarm would also trigger in the event of a cable break, because this oil pressure switch CLOSES when there is sufficient oil pressure.


CU Gremlin.

Hello!

I had a similar problem, and here's a simple solution (AFN):

Around 4200 RPM, the oil light started flashing, and a warning sound was emitted.

Solution:

The cable lug on the oil pressure sensor (not the one on the head) had come loose. After the cable lug was tightened, the problem was resolved.

So, your problem could also be caused by a faulty connection to the oil pressure sensor (a broken wire or a damaged connector).

Regards,

mild, gentle, soft, pleasant