MidnightMarauder Posted March 7 Share Posted March 7 Greetings, everyone. The glow plug light on my daughter's 2016 A-Class remains illuminated after starting the vehicle and continues to stay on while driving. The glow plugs were changed because she believed they were faulty. However, there was no alteration or modification seen. When initiating the automobile in the morning, it exhibits a little delay in the process of turning over, but ultimately starts up satisfactorily within a span of 5 seconds. The technician, who just performed a repair on the vehicle, used a code reader but was unable to identify the issue. It is possible that a defective sensor is causing the problem. I would much appreciate any guidance or recommendations.Thank you in advance Quote Link to comment Share on other sites More sharing options...
BENZE220AMG Posted March 7 Share Posted March 7 The glow plugs have been replaced, and the next step is to replace the relay/control module. Prevalent malfunction Quote Link to comment Share on other sites More sharing options...
xsports Posted March 7 Share Posted March 7 Alter the mechanism as well. Quote Link to comment Share on other sites More sharing options...
MidnightMarauder Posted March 7 Author Share Posted March 7 Thank you. Is it feasible to do a test on this item or just get a flyer and substitute it. Quote Link to comment Share on other sites More sharing options...
paulh2602601 Posted March 7 Share Posted March 7 While it may not be applicable to your specific model, based on my personal experience, if a vehicle continues to have difficulty starting on chilly mornings even after replacing the glow plugs, the issue is often with the glow plug relay. It is worth noting that this problem does not typically trigger a failure code. My recommendation is to choose for an original replacement rather than a cheaper alternative. While there are many inexpensive options available, they are not likely to have the same longevity. I speak from personal experience. Quote Link to comment Share on other sites More sharing options...
colinallcars Posted March 7 Share Posted March 7 One might do a voltage test on the glow plugs. Quote Link to comment Share on other sites More sharing options...
markjay Posted March 7 Share Posted March 7 Do not waste time, just purchase a motherboard component and replace the controller. This will resolve the issue, provided that you have not replaced the glow plugs with cheap Chinese components. Quote Link to comment Share on other sites More sharing options...
norbury.brook Posted March 7 Share Posted March 7 Based on the information provided, I recommend purchasing a relay. Although you have already replaced all the glow plugs, it would have been sufficient to just replace the broken one. Additionally, I suggest checking the charging rate of the battery and the battery itself, independent of the glow plug light. The A class engine is rather small and should start immediately. Quote Link to comment Share on other sites More sharing options...
DreamCatcher88 Posted March 7 Share Posted March 7 Oh, this evokes nostalgic recollections! The problem occurred on my W211 vehicle. I replaced the glow plugs, but the light remained on. Modified the module, however the light remained on. Examined the wiring and found no problems. Examined the just placed glow plugs - success! One of the plugs had inexplicably had a catastrophic failure and deformed significantly! Repaired malfunctioning glow plug - issue resolved! Quote Link to comment Share on other sites More sharing options...
MidnightMarauder Posted March 7 Author Share Posted March 7 Latest information... The glow plugs that were replaced with a relay are functioning well. Are there any further factors that might cause the glow plug light to remain illuminated? Quote Link to comment Share on other sites More sharing options...
norbury.brook Posted March 7 Share Posted March 7 Based on my previous post, I typically only replace the malfunctioning glow plug. In your case, since you have already replaced the relay and the light is still on, you will need a multimeter to measure the power going into each glow plug. To do this, connect one lead of the multimeter to the engine's ground and the other lead to the power source of the glow plug. The reading should be less than 6 ohms. It is possible that one of the new plugs has failed. Quote Link to comment Share on other sites More sharing options...
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