ABS light

[griston64]

Received my snazzy new code reader today so I thought I would give it a go

All fuel and ignition codes ok as I thought

ABS light is on and it gave me this code 1-5-2 Right front wheel sensor: open circuit or short-circuit to battery voltage

Being a novice at this does it mean I need a new sensor ?

[Laird Scooby]

Originally Posted by griston64

Received my snazzy new code reader today so I thought I would give it a go

All fuel and ignition codes ok as I thought

ABS light is on and it gave me this code 1-5-2 Right front wheel sensor: open circuit or short-circuit to battery voltage

Being a novice at this does it mean I need a new sensor ?

Is the ABS warning light on on the dash Mark? If a sensor is duff, it usually comes on about 10km/h or 6mph in real money.

Before that it should do the normal on for about 5-6 seconds with the ignition then go out - if it stays on at that point then the sensor is open circuit.

Rearranging those words, if the ABS light is behaving as it should, i would assume it's an old, uncleared fault. If your reader has the facility to clear the fault codes, use it, if not i think it's fuse #1 (like clearing the engine management ECU fault codes, pull it for 30-60 seconds and refit) to clear the memory then recheck with the reader.

If all is good, take it for a drive and then check again.

If all is still good, put the tester away and have your choice of beverage and forget about it.

If it does prove to be the sensor, you're in for a lot of fun with a drill, blowtorch and die grinder - unless you're very, very, very lucky!

[griston64]

Hi Dave

The ABS light is on all the time. I've pulled fuse and it's still on

[griston64]

On the dash

[Laird Scooby]

New sensor it is then Mark!

The old one is held in by a 10mm hex-headed bolt if memory serves and should, in theory, just pull out of the lower arm.

Only had to do them on my last 740 but ended up drilling, blowtorching and then die-grinding the remains of the old ones out!

Once out, i used the die-grinder to slightly enlarge then polish the hole to a mirror finish and generously smeared the body of the replacements with silicone grease before fitting.

What happens is the holes in the lower arm corrodes and the rust crystals grow, crushing the sensor. By enlarging the hole and mirror polishing it, then packing round the sensor with waterproof grease, it minimises the chance of the same happening again.

Despite the fact the same sensor (albeit with different plugs) is used on the Mk3 Cavalier on the front and the Rover 800 range on the rear, they still ain't cheap!

Cheapest on Rock Auto is £141, not sure about other sources as yet but if you can find good secondhand ones that have come out intact, that would be the way i'd go.

[Laird Scooby]

Just found these NEW on fleabay :

https://www.ebay.co.uk/itm/ABS-Senso...1/263202894244

At that price, i might even buy a pair myself for "stock"!

[griston64]

Cheers Dave

They are almost too cheep

I'm going to see a chap who is supplying me with strut rods and control arms for my front suspension re build ( I'm getting them shotblasted, painting with POR15 and then re bushing ) I will see if he has a good secondhand sensor