BMW E46 VANOS seal replacement and VANOS faults
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Should E46 VANOS seals be replaced in advance?
No. There is no replacement interval for the seals in the service schedule. They are replaced only when VANOS performance weakens or a fault appears.
What parts are needed for an E46 VANOS seal kit?
On the M52TU you need the VANOS seals, a valve cover gasket, two torx bolts for the VANOS unit, the unit's profile gasket and two washers for the banjo hose.
Does a VANOS fault code 104 or 106 go away after replacing the seals?
Not always. The exhaust-side solenoid can be dirty and stuck, and cleaning can restore operation. Code 106 was cleared by replacing it with a used solenoid. Also look for intake leaks with smoke.
Do the VANOS units on the N42 and N46 have seals?
No. The VANOS cam gears of the N42 and N46 adjust themselves, and there is no seal kit for the unit. The seal kit belongs to the solenoid valves.
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