Well lads, before you rush off and purchase, are you sure you have fully researched all your options? I say this because it might have become apparent to some members on the forum that I research the @rse of any product before I buy it.
There is another option, I installed it [front and rear] on a Volvo S40 in February 2009. It cost me £99.95 delivered back then, and it did what is said on the tin.
But the Wife nattered to go back to a Focus, so nine months on I traded the S40 in for a Focus. During negotiations the dealer said they would offer me the same price for the S40 with or without the parking aids on the car.
Why one might ask? Well a potential purchaser comparing like for like 2004 reg S40's elsewhere, would not expect it to have parking aids on it. Besides if a potential customer did indeed want parking aids, the garage could sell them that option at an extra cost.
So I asked the wife if she wanted front and rear parking aids on the replacement Focus? Because we did not have them on the Focus that was replaced by the Volvo S40. To right she did as she loved the security they gave her parking the car, or doing three point turns on narrow country lanes flanked by stone walls on either side.
So I just whipped the two parking aids ECU's of the car [a five minuet job] I then ordered up replacement wiring, sounder, and antenna packs. Back then in October 2009 they cost me £23.89 delivered. And installed them on our present Focus, been on for over two and a half years now..............so all told an excellent buy, being that it's transferable to another vehicle at minimal cost.
I did the rear antenna in situ, but I had to take the front bumper off to install the front antenna.
I did tests sheets on both the Volvo and Focus installations [cannot upload the results for some reason] But here are the results for the rear sensors on the Focus.
Reversed towards a stone wall: Detected by repeating quickening alarm @ 67cm. First Solid Tone Alarm @ 29cm. Second Higher Pitched Alarm @ 16cm from the wall.
Reverse towards a parked car: Detected by repeating quickening alarm @ 42cm. First Solid Tone Alarm @ 14cm. Second Higher Pitched Alarm @ 6cm away from the other car.
Reversed towards a 25mm square pole [edge on, to make it harder to detect] Pole in question is used to deter peeps parking in an private allocated parking space. Detected by repeating quickening alarm @ 30cm. First Solid Tone Alarm @ 9cm. Second Higher Pitched Alarm 4cm.
Once the parking sensor is activated by selecting reverse gear, or flicking the switch for the front sensor. You hear a beep which tells you the system is armed and working. No beep means the system is not receiving a signal back from the antenna. I've never experienced this not armed fault signal in over three and a half years of use. But I tested it works by disconnecting the connection to the sensing antenna, and yes I did not get the armed and working signal beep. I don't know if this is the case with the ultrasonic type, so cannot comment in that regard.
[url="http://www.which.co.uk/cars/choosing-a-car/car-features/parking-systems-explained/parking-sensors/"]Which Report: Ultrasonic V Electromagnetic[/url]
OK they have gone up in price, and am not saying you should install these instead of the Ultrasonic ones available, as any purchase is as always a personal choice. I know they fit perfectly on the MK2 Focus bumpers, but cannot swear they are compatible with the bumpers on the MK2.5 of Mk3 models...........so do your own research in that regard.
For anybody deciding to go the electromagnetic route, one tip given on the installation sheet. Having affixed the self adhesive antenna is to the inside of the bumper. To give it added protection from road debris and ensure the antenna does not come lose, over cover it with duck tape.
No photo's of them fitted on the car, you will just have to take my word for it that they look great