UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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If this is the glow plug light that has come on again after the glow plugs were replaced this can be due to a fault with the glow plug wiring leading from either the glow plug relay or ecu (whichever one this model uses here as some are different) or an issue with the relay or ECU itself needing replaced to correct this.I have seen both cause this issue here.The first check is to check over the wiring for any shorts or damage needing repaired and if found to be o.k. and if this is the glow plug light coming on this can be an internal fault in the glow plug control relay or ECU itself needing replaced.I would also make sure there are no blown or damaged fuses at all needing replaced.
If this is not what is occuring here let me know so we can continue.
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O.k.,if the relay is new and the glow plugs are new this can be a fault with the wiring from the relay to the glow plugs themselves or wiring leading to the relay to activate the relay for proper operation.I have seen wiring issues cause this before.If you have not inspected the wiring for any issues this is what I would check next to see if you locate any issues needing repaired with the wiring.
The only other component I have seen cause this is the engine computer.If it isn't sending the correct signal to activate the relay I have had to replace the engine computer in some cases.