A Class intermittent sticking thermostat

[pp.1998]

Is there such a thing as an intermittent sticking thermostat?

I brought a 2013 A Class from an approved dealership two weeks ago. The next day the engine management light appeared. Sent car back to dealership to be looked at. The engine management light didn’t appear with the garage until a few days of them road testing, they’ve come back to me telling me “We have carried out further tests and we believe the issue is being caused by an intermittent sticking thermostat. Which would be the reason why it took awhile for the fault to reappear”

They have replaced the thermostat and temp sensor, and have road tested 50 miles without fault coming back on.

My question is, is there such a thing as it being intermittent? Someone I spoke to seems to think it ether works or doesn’t.

 

[Blobcat]

Hello and welcome,

Sounds like they're telling porkie pies to me. The EML will log a code, a lot are related to emissions related sensors and equipment

 

[pp.1998]

Hello and welcome,

Sounds like they're telling porkie pies to me. The EML will log a code, a lot are related to emissions related sensors and equipment

Thanks for the reply. I had someone get the code for me, before the car was sent back. It was P0128.

 

[mioba]

Stat wont trigger the EML as its purely mechanical

Possible the temp sensor, triggered the EML and to be on the safe side they replaced both.

Stats do wear down and do need replacing

 

[star]

Stat WILL trigger the eml. We have replaced loads for this. On a rare occasion it will clear without replacement but the norm is to replace v