In the last week or so my car has started to make strange beeping noises each time I lock it. It tends to happen after I've been out for a drive and not if I simply go out unlock it and then lock it again.

The first time (about 10 days ago), the stop/start technology didn't shut down the engine after a 20 mile drive, which is a little unusual, but not unique. I locked the car and there was a whining/screeching noise from under the bonnet for about 4/5 second and then it just stopped. The car worked fine the next time I used it, including the stop/start. However, although there is no screeching anymore, the car now beeps when I lock it.

The noises are around the driver's side power fold mirror and the dashboard. The only way I can describe them is that they sound like an old 56k modem. They last about 3/4 seconds and then stop. The next time I use the car, all seems to work okay; it's just this noise.

The car is 23 months old and has 5,300 on the clock and the only other strange issue at present is that fuel economy has improved, yes improved, by about 4mpg (8%). This started about 1 month ago, but could be due to the hot weather meaning the engine is not taking as long to warm up. Apart from adhoc 500 mile round trips to visit family 2/3 times per year, the car is only used once per week for about 2 hours in total with a round trip of about 35miles (17.5 there - stop and then 17.5 back).

Anybody have any ideas. Thanks in advance

The improvement in MPG is definitely down to the heat/time of year. One of the perks of summer!

I’m not sure what the beeping noise is tbh, I know that my own car makes a very high pitched constant beep (much like the tiny speakers you used to connect a 9v battery to when making circuits in school) and I was toldit is the cars ECU.

I remember when I had my ford focus (62 reg) it used to make strange beeps after locking, not constant like Jonro2009 described, but similar tone. Will have to listen out on my fiesta see if is does the same, it's probably a ford thing 🙂

I will try and get a wee clip of the noise, sometimes my descriptions are well off lol. Bit like my sense of direction, I got lost looking for change in my pocket the other day 😂

Thanks guys.  It's definitely not a single tone; just a random series of bleeps and blips.

I double check the doors to make sure they are being locked and they're okay (thinking of these scams that can remotely unlock your doors). Perhaps it's something to do with the ECU randomly coding the locking system. Perhaps I've have been targeted and the ECU is now confused. The car is not keyless start.

I'd not heard it before, but given the strange nature of the sound, probably would have done especially as it's heard on the drivers side. The sounds are something you'd relate to a computer, but no idea why it's started now and what it's supposed to be doing.

Are you sure it isn't just the motor on the mirror as they fold in & settle down?

1 hour ago, Mavroz said:

Are you sure it isn't just the motor on the mirror as they fold in & settle down?

It's not the folding of the mirror. That's a whirring sound and this noise comes after the mirrors have completely folded.

It may be the electronics of the mirror, but not the actual folding noise of the mirror. Alos, it's only recently started doing it

I was hoping to post a clip of the noise today (first time I've used the car since last week), but today there was no noise, so I'm at a loss at to what it was and hopefully it won't happen again.

The only thing I can think of is what I mentioned earlier and that is that I was the potential target of car park scammers. The only evidence I have of this is that before the noise was first heard I parked in Asda car park and there were two guys in a car nearby. They were looking around the car park and then at me, followed by looking down at something on their lap. Call me suspicious, but they didn't look like people who would do their weekly shop at 10am on a weekday morning in Asda. It was simply a feeling I had rather than anything else.

When I returned to my car, the guys were gone and my car looked okay, but when I unlocked it I was taken aback and thought "were my mirrors already unfolded?" Paused for a moment and then thought "No, they can't have been, I'm imagining it" When I arrived home the stop/start did not cut in when I parked on my drive - the first time it has failed to do so. Following that for the next few drives these noises were heard - was the ECU confused and constantly resetting? I don't know, I'm not an expert, but all very strange and as I say, hopefully it's worked it out now and is okay going forward.

Hi I need help got a Ford Mondeo duratec he petrol 2001reg changed the fuel pump it is working fine but the car won’t fire up now it’s got fuel it’s relays are ok it’s got spark need help and the head lights fuse carries on blowing 

3 hours ago, Joey 87 said:

Hi I need help got a Ford Mondeo duratec he petrol 2001reg changed the fuel pump it is working fine but the car won’t fire up now it’s got fuel it’s relays are ok it’s got spark need help and the head lights fuse carries on blowing 

You will need to post this in the Mondeo forum pal. Create your own post as this isnt the right place. If you’re not sure what to do maybe one of the mods ( @Stoney871 ) can move it for you. 

Please so sorry for that new to this sorry once again