2021 Honda CB125F Engine Management Light Cause Overfilling Fuel Tank!

[PeteOnArt]

Hi I purchased the Honda 125F 3 months ago and the engine mngt light has come on three times in that time frame. The first time it came on it went into get home safe mode until the bike was stopped and restarted. The Eng Mngt light stays on until the bike has been restarted a few times and then it goes out. The second time it came on I took the bike to the dealer (still under manufacturers warranty), who stated that the fault code suggests intermittent fault multiple missfires caused by petrol having got into the Eco chamber (i think that is correct), as a result of somebody overfilling the fueltank. They said there is no fault with the bike and wanted to charge me for the time spent investigating and resetting the system. The third time the light came on, same scenario as before, the dealership are still adament that it is being caused by fuel in the Ecochamber and it will take time to clear / dry out. As long as the bike runs correctly after restart and the Engine Mngt light goes out after a few cold restarts can I continue as is. That is what I am doing but am very sceptical about this being caused by someone, (previous owner as I have still only filled the tank once after the first occurence took place), having overfilled the fuel tank. Does anyone else have experience / knowledge of this issue. Is there another more likely cause? My neighbour has a older Honda 125 and always fills the tank to top and has not had an issue. Thanks..

[PeteOnArt]

The light came back on today. I had a look under the seat to investigate the On Board Diagnostics Connector (OBD) but could not find one. I suspect Honda have done something naughty for the 2021 model as the garage where I bought the bike said they do not have the correct connector socket for checking the fault on this bike and directed me to the main dealer. I was going to buy a OBD2 module but wish to know where the connector is situated and if I can get a connector that fits this model Honda. Can anyone help with this?

[Bender]

44 minutes ago, PeteOnArt said:

The light came back on today. I had a look under the seat to investigate the On Board Diagnostics Connector (OBD) but could not find one. I suspect Honda have done something naughty for the 2021 model as the garage where I bought the bike said they do not have the correct connector socket for checking the fault on this bike and directed me to the main dealer. I was going to buy a OBD2 module but wish to know where the connector is situated and if I can get a connector that fits this model Honda. Can anyone help with this?

No idea is the following any help 

 

https://bikesandtravels.com/biker.aspx?ride=7235

[PeteOnArt]

Thanks this looks hopefull. Pete

[Bender]

11 minutes ago, PeteOnArt said:

Thanks this looks hopefull. Pete

Lets know what it says, good luck

[onesea]

Having been tempted by one of these for my commuter it makes me question the bike.

 

I would :

1. Read manual for any warnings regarding over filling fuel tank,
2. I would take symptoms to another dealer,
3. Get an exact explanation from current dealer,

 

If it happens again question if bike is fit for purpose.  Most biker brim the tank so I don’t see why this would be any different.

EDIT:

Manual states “Do not fill with fuel above the lower edge of the filler neck.”  Although I suspect that is standard..

https://www.honda.co.uk/motorcycles/my-bike/honda-motorcycles-owners-manuals/_jcr_content/par1/textcolumnwithimagem_495872239/textColumn/richtextdownload_90f/file.res/CBF125M-21-OWNERS.pdf

Also if bought from Honda do they not check there vehicles before they sell them?  They should rectify fault, don’t be pushed over by a dealer.

Edited July 15, 2022 by onesea