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Experience:  BMW Master Technician over 20 years BMW Dealership Experience. BMW Auto Repair Shop Business Owner
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BMW 525i Fault code 4F92 EGS ratio monitoring,clutch A-C

Customer Question

I already overhauled auto gear box. fault code come out as follow: - 4F92 EGS:Ratio monitoring,clutch A-C. What does that mean? Where does the part located...in which part of the gear box or other part of the vehicle?
Submitted: 3 years ago.
Category: BMW
Expert:  George replied 3 years ago.

George :

This is for the speed sensors in the transmission, you have one sensor that monitors the input shaft and one that moitors the output shaft of the transmission.

George :

These are to detect any slippage inside the transmission, it is possible they were not hooked up properly, or they were damaged, or the transmission was not assembled correctly.

George :

This is the torque converter side sensor location.

George : BMW TIS - 24 35 550 Replacing pulse generator (turbine speed) (A5S 360R / 390R, A4S 200R)
24 35 550 Replacing pulse generator (turbine speed) (A5S 360R / 390R, A4S 200R)
Full Size Image
Important!
After completion of work, check transmission fluid level .
Use only the approved transmission fluid .
Failure to comply with this requirement will result in serious damage to the automatic transmission!
Full Size Image
Necessary preliminary tasks:
· Remove transmission oil sump .
Full Size Image
Pull off plug ①.
Release screw ②.
Tightening torque Shift Valves, Parking LockShift Valves, Parking Lock24 34 4AZ .
Withdraw pulse generator ③.
Read out fault memory of EGS control unit. Check stored fault messages, eliminate faults and then clear fault memory.
George :

This is the output shaft speed sensor and location.

George : BMW TIS - 24 35 551 Replacing pulse generator (output speed) (A5S 360R / 390R, A4S 200R)
24 35 551 Replacing pulse generator (output speed) (A5S 360R / 390R, A4S 200R)
Full Size Image
Important!
After completion of work, check transmission oil level .
Use only the approved transmission fluid in this automatic transmission.
Failure to comply with this requirement will result in serious damage to the automatic transmission!
Full Size Image
Necessary preliminary tasks:
· Remove transmission oil sump .
Full Size Image
Pull off plug ①.
Unscrew bolt (2).
Tightening torque Shift Valves, Parking LockShift Valves, Parking Lock24 34 4AZ .
Withdraw pulse generator ③.
Read out fault memory of EGS control unit. Check stored fault messages, eliminate faults and then clear fault memory.

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