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hi i am assuming you mean heater or glow plugs first disconnect the negative battery lead & then disassemble the air filter & pipework now the ECU unit & other bits that obstruct access to the plugs underneath. carefully unscrew each glow plug after takeing off its electrical lead ,I stress carefully because they can snap off in the head & then its a very dear garage job on this engine they are very thin.Make sure the new plugs are a well none make Champion or NGK dont buy crap with these or you will be replacing them very soon I have done it after replacing the four plugs replace the electrical leads & ECU plus connecters plus air filter & pipework replace the battery lead & try it. The old plugs can be checked with a test meter on resistance, if there is no readings then that is 100% that it is no good, if there is a reading it could still be bad ie only opens up in use.When one of these is down it usually shows on the display as a yellow maintenance engine cymbal hope this helps.
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