BMW E46 ABS wheel speed sensor fault and code 49
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What does E46 ABS fault code 49 mean?
Code 49 indicates a signal fault in the left rear wheel speed sensor. The speedometer is connected to the same sensor, so it may stop working. Measure the sensor before replacing it.
Why is the ABS light still on after a new wheel sensor?
The cause can be a wire that the tyre has rubbed through, or a wire that is broken internally. The measurement must be done under load, not just with a continuity check. Dirt in the sensor hole, a dirty tone ring and a sensor mount that is too loose also cause the fault.
What is the E46 ABS wheel speed sensor part number?
The BMW part number is 34 52 6 752 682, and it fits the E46 and Z4. An aftermarket sensor may work, but the original is a safer choice. A rusted sensor can break off when removed.
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