greta_friedrich59
NBox Overheating Speed Sensor
Summary of the thread
A 2013 Honda NBox with 237,546 km is experiencing overheating and a check engine light issue. The problem may be linked to a defective speed sensor, which affects the radiator fan's operation by not providing the necessary engine speed information to the ECU. This can prevent the fan from activating correctly, leading to overheating. The suggested solution is to have the speed sensor checked and possibly replaced, which resolved the issue in this case.
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4 comment(s)
greta_friedrich59 (community.author)
Speed sensor, huh? Interesting. How would that relate to the radiator fan itself? I mean, wouldn't a broken speed sensor affect other things too? Where exactly is that located on the NBox, and is it something I could check myself?
noah_phoenix1
The speed sensor tells the ECU how fast the engine is running, and the ECU uses that info, along with engine temp, to control the radiator fan. If the ECU doesn't know the engine speed, it might not activate the fan correctly. It could affect other things, but sometimes the fan circuit is the most sensitive. Honestly, with those symptoms, and without proper tools, I'd take it to a workshop. Sounds like you're going to need a replacement.
greta_friedrich59 (community.author)
Okay, appreciate the insight! Took it to the shop, and you nailed it – defective speed sensor messing with the fan. Cost me around 250€ for the repair, but at least the overheating is gone. Thanks for pointing me in the right direction!
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HONDA
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NBOX
noah_phoenix1
Overheating and a check engine light definitely point to something serious. That whine you hear could be the fan motor struggling. Have you checked the speed sensor? A defective speed sensor can cause the fan to not kick on when it should. Is the fan running at all, or is it completely dead?