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code reader says glow plug #2 is out.

I was going to replace all the glow plugs, but didn't have time to do so tonight. So I figured I'd replace #2 so that the engine light would go off. I did 2 and 4 because they are very easy.. Got in the jeep, cleared the code, started it up and everything looked normal. Check engine light didn't come back on. Turned off jeep, but the engine cover back on and drove it from the garage back the house, about 50 feet. When I pulled up, the engine light was back on and the code reader still says #2 glow plug is out.

Just to be sure, the #2 glow plug is the closest one to the rad on the drivers side correct?
 
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