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Ford Focus 2008 (58) Titanium Diesel Electrical Issues

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Hello all,

I am after abit of help, a few days ago I went to lock the car via the central locking and it would not lock, upon further inspection I found the following had just grown a mind of its own,

Central locking not working although the indicators are still showing when key clicked.

Internal lights stay on unless manually turned off.

Parking light and engine light permanently on.

Indicators not showing up/sounding on dash-although they are still visually working thankfully.

Heated windscreen no longer working, the button no longer lights up.rear still works.

The temperature gauge no longer registers, just two blank lines which then shows the red snow flake.

So not too good, moments before the car was working like a dream as always so no idea what has prompted all these issues. I have this morning gone through the fuse box under the glove compartment inspecting every fuse, apart from my rear number plate lights wery fuse was fine. I then had a look in the fuse box in the engine, again the fuses I could look at were fine, although the small black square plug ins I am unable to say if they are ok or not as I am not sure what the indicator is.

When I press the key inside the car I can hear a sort of clicking coming from the fuse box area under the glove box but there is nothing visual to help.

Any help would be really really appreciated, to make the timing of this even worse I am test driving a new ST this afternoon and I am planning to trade my car in!!!!

Thanks everyone


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Thanks mate,

Had a good look at the earth cable and nothing appeared out of shape. I have spoken to a friend who suggested it may be a relay within the engine fuse box. Only way to check that out is get it hooked up and check the ECU.

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disconnect the battery for a few hours, reconnect and reattempt to start. that might clear the U0140 temporarily.

It sounds like a communication error, which a restart should be able to help.

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Thanks guys. I have detached the battery today and hopefully when I hook it all back up this evening I have some luck.

With regard to what you said stones, I have checked every fuse and inspected the wiring as best I can, it all looks in good order. How do I go about testing the relays or finding out of they are broken?


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You can run a 12v charge through the low power legs of the relays and should hear the high voltage relay click.

Use a circuit tester set to voltage.

TBH, even if the relay clicks it doesn't necessarily mean it's working properly.

Sometimes a swap is needed to be sure.

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