Where is locate the abs speed sensor A in a bmw 528i 98?

left side abs, center: engine, right side all the intake crap,

The P0500 code indicates a problems with the ABS system. If you have recently replaced wheel sensors, it sounds like one or more may be disconnected or flaky.

From datsc.com:
What does this mean? OBD Code P0500refers to
Basically this means that the vehicle's speed as read by the Vehicle Speed Sensor (VSS) is not working properly.
Symptoms Possible sumptoms of OBD code P0500
loss of anti-lock brakes the "anti-lock" or "brake" warning lamps on the dash may be lit the speedometer or odometer may not work properly (or at all) your vehicle's RPM limiter may be decreased the shifting of an automatic transmission may become erratic other symptoms may also be present
Causes Possible causes of OBD code P0500
A code P0500 may mean that one or more of the following has happened: The Vehicle Speed Sensor (VSS) is not reading (functioning) properly There is a broken/frayed wire leading to the vehicle speed sensor The vehicle's PCM is not correctly configured for the actual tire size on the vehicle
Possible Solutions The simplest thing to do is to reset the code and see if it comes back. Next, check all wiring and connectors that lead to the speed sensor. The location of the sensor depends on your vehicle. The sensor could be on the rear axle, transmission, or perhaps the wheel hub (brake) assembly. If the wiring and connectors are OK, then check the voltage at the speed sensor. Again, the exact procedure will depend on your make and model of vehicle. If everything looks OK, replace the sensor.

On the ouside of the transmission case.

wheel speed sensor, believe the front right or driver rear, one of those two, they're different, and not interchangeable---the fronts and rears.....both fronts are the same and both rears are the same but the front are not the same as the rears. There is 4 of them btw.

This means the transmission has gone into safe mode. Usually happens if there is an ABS sensor that has gone, is the ABS light illuminated?

some transmission system has a feature that work with abs system.
when one of your wheel spind faster than the rest, the wheel speed sensor send signal to the onboard computer. the computer then reduce the vehicle speed for safety.

You have 4 wheel speed sensors. There is one at each wheel located just behind the hub. You can trace it by loacting the black insulated wire leading out from the wheel well and going behind the wheel.

hi the speed sensor is located on either the drivers wheel hub with the abs sensor, or the passenger wheel hub, but they normally are on the drivers side....hope this helps..ps you can get them off ebay lol..

ABS/ASC module is faulty
CLASSIC ABS FAILURE SYMPTOMS:
- Most of the time, the problem is the ABS module or one of the 4 wheel speed sensors (& sometimes the brake pressure sensor)
- In my 2002 BMW E39 DSC, three orange (warning) cluster display lights lit, ABS, Brake, & DSC
- The 3 warning lights reset when the ignition is turned off, only to repeatedly reappear within minutes of normal driving
- The fault is often intermittent leading you to falsely believe you've resolved the problem (proper diagnosis is important)
- Sometimes the fault only appears when the engine is hot; other times only at speeds over 40 mph
- Carsoft may erroneously show a rear speed sensor failure; but just replacing the speed sensor may make no difference.
- All the work is in correct diagnosis of the problem; parts replacement is trivial (from 1 to six bolts in a few minutes)
- Hence, this BMW E39 ABS 3-warning light DIY will concentrate on understanding and diagnosis of the problem

Hi samantha_230, the abs control unit will have to be coded to the car, but if this helps the speedo takes it's information from the rear left speed sensor, which also controls the abs for the same wheel so it may be worth getting this checked to make sure it is sending the right signal as this part is alot cheaper than a control unit, regards mark.