2021 Ford Focus Pricing and Specs

This all depends on whether the 2005 Focus is a Mark 1 or Mark 2 version of the Focus. So that's the first thing to ascertain. If they're both Mark 2 cars, then there's a very good chance that the boot release will be the same in either (and, therefore, interchangeable) as we're talking about the same car.

But even if the 2005 Focus is a Mark 1 model, it would still be worth physically checking to see if the release latches are the same. That's because even though the Mark 1 and Mark 2 Focuses were different cars, many manufacturers (Ford included) carried over some mechanical parts (such as latches and cables) from previous models to save on development costs. A good example of Ford doing this was the succession of 1980s Falcons including the XD, XE and XF models which all used the same exterior door handles. So compare the latch you have with the latch on offer and make sure it operates in the same way and direction, uses the same mounting points and will connect to the same cable. If so, you might just be lucky.

Just for starters, the ZX4 is a four-door sedan, while the ZX3 body is the three-door hatchback. At the very least, that will mean differences in the wiring loom as regards door-courtesy and boot/tailgate lights. Cars will have different wiring looms depending on their transmission, too, so even if the engine is the same in both cars, the loom might not be.

Then there's the more basic question of whether they're actually the same model of Ford Focus. Ford Australia switched to the all-new second-gen Focus in April 2005, and if your 2005 Focus is that newer version, the wiring will not be compatible with the 2001 model. But even if they're from the same generation of Focus, swapping a wiring loom from one car to another involves many, many hours of work.

They might both be Ford Focuses, but they're a couple of generations apart meaning that they are not only physically different, they also used different transmissions to each other. Even if, by some miracle, the older gearbox would bolt to the newer engine, the car still wouldn't have the correct electronics to make the transmission work properly.

Even if the transmission in question was a manual which requires much less in the way of electronic control, the unit in the 2008 Focus was a five-speed, while the later car used a completely different six-speed. Even things like the clutch and flywheel would be incompatible. You'd probably even find the gear-shifter for each transmission enters the cabin in a physically different spot, meaning the interior trim would no longer fit.