It started throwing P0676 out of the blue one morning which indicates that the glow plug on the #6 cyl is open. The last digit in the code indicates the cylinder number. I know you're supposed to replace all 8, but at $20 a piece, I'm going to chance replacing only the bad one. On the Dmax, the cylinders are numbered starting from the passenger front 1-3-5-7 and the driver's front 2-4-6-8. The number 6 cylinder is the third one from the front on the driver's side. First, disconnect the batteries. Remove the inner fender liner which is the biggest PITA of the whole process. I didn't show pics of that because it's not hard to figure out, just that there are about 10 clips holding it in and it's got a couple of big harnesses clipped to it from inside also. You can get a good view of all 4 glow plugs this way- they're right on top of the exhaust manifold and slightly angled towards the back of the engine. There will be one wire with an 8 mm nut holding it on. Next, remove the 8 mm nut from the offending glow plug. Next, using a 12 mm deep well socket, carefully remove the glow plug. I'm not in the salt belt so corrosion isn't an issue here, but I imagine these things could get pretty nasty over time... penetrating oil is probably a good idea. New and old. The tip isn't broken off the old one THANK GOD! :hurray: They're supposed to have 1 ohm or less resistance; this one might be a little over. I put some anti-sieze on the threads and started the new glow plug in the head by hand making sure not to cross the threads. Tighten to 18 ft/lb. Reinstall the connector and put the 8 mm nut back on the connector. Put the fender liner back in, clear the codes and you're done.