Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1993 BMW 740iFACTORY OEM SERVICE PROCEDURE
Circuit Test
- Turn ignition off. Connect "T" plug with adapter "A" to ABS wiring harness connector. Connect lead from adapter "A" to cigarette lighter. Red light should come on. Switch to position No. 3 on adapter. Disconnect speed sensor connector. Speed sensor (DF) reading should be at least 999,000 ohms. If DF reading is less than specified, go to next step.
- For left front sensor, check electrical continuity in terminals No. 4 and 6. Place jumper wire across sensor terminals on wiring harness side. DF reading should be less than one ohm. If DF reading is more than one ohm, inspect wiring harness. If wiring harness is okay, replace speed sensor.
- For right front sensor, check continuity between terminals No. 11 and 21. Place jumper wire across sensor terminals on wiring harness side. DF reading should be less than one ohm. If DF reading is more than one ohm, inspect wiring harness. If wiring harness is okay, replace speed sensor.
- For left rear sensor, check continuity between terminals No. 7 and 9. Place jumper wire across sensor terminals on wiring harness side. DF reading should be less than one ohm. If DF reading is more than one ohm, inspect wiring harness. If wiring harness is okay, replace speed sensor.
- For right rear sensor, check continuity between terminals No. 24 and 26. Place jumper wire across sensor terminals on wiring harness side. DF reading should be less than one ohm. If DF reading is more than one ohm, inspect wiring harness. If wiring harness is okay, replace speed sensor.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.