- May 31, 2009
- Littlehampton, West Sussex
- Mercedes W124 300D/ S203 220cdi
Hi everyone, my problem is that sometimes glow plug light comes on when it shouldn't. before starting the engine it goes on and off as it should, but after starting sometimes it's on right away, or after some time ( like anything between 5-20min ) or is not coming on at all sometimes. well first thought glow plugs ( changed about 1 year ago) so checked them and they all pretty much at 1,3-1,5 Ohms, so they're ok. then i remembered i was playing with my temp sensor ( one with 2 pins in the head ) and I know that one of those pins goes to temp guage on dash ( it's showing ok about 85-90 after warm up) the other pin goes to glow plug relay and it's responsible for "afterglow" ( I presume if it's not good it might mess up and light is comming on when it not supoused to). so do you guys think I have a bad temp sensor? or is it glow plug relay? how do i check for both??