Date registered: Jan 2004
Vehicle: 1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
Location: Ocean Isle Beach, NC
Mentioned: 0 Post(s)
Quoted: 32 Post(s)
When one glow plug went bad on mine, I got an idiot light. Others have said that they did not get one with only one bad plug. It is very easy to test your plugs using an ohm meter. Disconnect the glow plug connector at the relay and check each terminal. Good plugs will read about 0.7 ohms. Another common issue might be an air leak from bad O-rings. Both well covered in the 210 section below.