Hi! Don't know how many of you have aftermarket heaters installed but I do and it's causing me problems.

Couple of months ago my check engine-light appeared to the dash. I read the fault codes with VCDS and it showed like this:

1 Fault Found:

5551 - Engine Coolant Temp. Sensor (G62)

P0116 00 [237] - Implausible Signal

MIL ON - Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Status: 00000001

Fault Priority: 2

Fault Frequency: 1

Mileage: 150399 km

Date: 2016.01.22

Time: 17:09:51

Readiness: 1 1 0 0 0

I cleared the code and everything was ok. After couple of days I did a random check with VCDS and the fault code was back.

I replaced the sensor and cleared the code.

Today the check engine-light came back. Same result with VCDS. Implausible signal...

Every time this has happened after using the aftermarket Webasto heater.

I use the heater every day during the winter here in Finland.

Some one told me that the use of the heater may cause this kind of a problem.

The heater heats up the coolant and after the engine is running it starts to cool down.

Has any one a solution for this?

I like to go in a warm car with a clear windows...

Hi there.
Not many on here using Webasto or Eberspächer I think.
I installed the Webasto ThermoTop C nearly 3 years ago.
The heater has worked flawlessly, but I have had a few snags with the ThermoCall3.  But I think this was either an App-bug or related to the mobile network provider.
Problem was I could only start via SMS, not the dial-up option.

But of course, I could also use the onboard start-stop button.
I have never had any issues with warning lamps so I think the system is OK.
Sorry for not being able to help you, but there are some really experieced Webasto guys around. Try the Webasto importer.

Just got touch with RossTech. Waiting for a response.