DB9 Top Gear Track
AO Silver Member
Join Date: Jan 2007
Location: United Kingdom
County: East Sussex
Right behind the brake disc is the ABS sensor mounted into the upright (they're sided so you have to get the right one). I'd read in the forum they can easily be broken when removing... so decided to leave mine in when I had the front wheel bearings replaced.
I took the uprights to my local garage, they had to use a lot of heat to get the bearing housing bolts undone and, yep, one of the sensors came back knackered.
The sensor wires pass under the wheel arch lining and up into the engine bay right in the corners near the wing mirror, if you remove the triangular lumps of rubber in the corner you'll see them, there's a connector for each side in the engine bay right next to the suspension mounts.
It's easy enough to unplug the connector but the end you want (off to the sensor) is stubbornly fixed on its mount. Finally noticed a small plastic 'pin' just sticking out on the underside, use a small screwdriver to move this pin sideways (can't rememeber which way, try both) and the connector will slide of its mount.
If you have a multimeter measure the resistance at the pins, you'll need long delicate probes to get in there, should be around 6 Meg Ohms one way, reverse the polarity and it's about 4 Meg Ohms.
Mine was reading open circuit and the failed sensor was confirmed by FES. Have to say the alarm was permanent not intermittent.
I removed the old sensor from the hub fairly easily, the retaining bolt was very easy and gave the sensor a good soak with plusgas. A 14mm spanner fitted nicely over the bit of the sensor where the bolt goes and managed to turn the sensor in its hole... athough it turned back-and-forth it wasn't coming out. So with the sensor turned, the bit I put the spanner on now gave and edge to work with. I layed a long screwdriver from the front round the back of the hub, located it on the sensor and through gritted teeth gave the screwdriver a tap with a hammer....and out popped the sensor.
Thought I'd broken it at first but no, it came out in one piece. Being plastic they're easy enough to drill out but I didn't fancy having debris back there that could damage the new sensor.
What makes you think it's front right, is there obvious damage? I also managed to shear one of the locating studs, had to drill it out, they're only a couple of quid from a dealer.
Loose - not close, compact, or tight in structure or arrangement
Lose - to part with or come to be without, as through theft, accident, negligence, etc.