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I have an OBDII code of P0380 (Glow Plug/Heater Malfunction Circuit "A")

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I have an OBDII code of P0380 (Glow Plug/Heater Malfunction Circuit "A"). How do I know which Glow Plug it is?

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Take off the glow plug harness. Use a voltmeter, set on Ohms. Black on battery negative. red on top of glow plug. All glow plugs should give back the same reading within a small margin.

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