Help. Where do these plugs go? 2006 C280 W203

[daveseavista2]

Hi.
I have just replaced my inlet manifold and can't find where the two plugs at the front of the engine at the right hand side go. The corrugated plastic cover goes behind the oil filter and under the secondary air pump but I can't see any sockets for them to go into. The car starts and runs but is idling rough like one cylinder is not firing. This may be due to another issue related to the reassembly.

Does anyone know where I plug these into?

Many thanks

 

[daveseavista2]

Found it. It's behind the serpentine belt on the right hand side of the top hose coming out of the block. Oddly it fixed the rough running but as I assume it's the engine temperature sensor I don't know why?

 

[Jobsworth]

Well done! Negative temperature coefficient sensor. Resistance goes down as temperature goes up. Therefore open circuit will read as really cold temperature, so mixture will be seriously rich, hence rough running.