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Old March 15th, 2019, 09:27   #1
Veteran Member
Join Date: Apr 2015
Location: Ohio
Fuel Economy: ~42
Default Replace bad glow plug or all?

Hello all. Got a CEL last night, scanned for codes and it was P0673 for cylinder 3 glow plug. My question is, should I replace just that single glowplug that is bad or all 4? Iím not sure when, if they even were replaced before. Thanks!
2006 Jetta TDI - 190k - EGR & Cooler Delete - ECS Dog Bone Insert - Frank06 Cam - Muffler & Resonator Delete - VCDS mods
2013 Passat TDI - 15k - VCDS Mods
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Old March 15th, 2019, 09:34   #2
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Personally I’d do just the one, check the rest , and motor on.
2001 golf auto to 5 speed manual swap,G60/VR6 clutch setup,coolant migration mod.
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Old March 15th, 2019, 10:01   #3
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Join Date: Apr 2010
Location: Mid MI
Fuel Economy: 47'ish

Personally, I'd look at the wiring harness before doing anything.
The only thing I can pass is a fuel stop, but I'm OK with that.
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Old March 15th, 2019, 10:13   #4
Join Date: May 2004
Location: central Ohio
Fuel Economy: 50/45/35

Good advice. You can also check the plug with an ohm meter to verify it is in fact bad, then do all 4.
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