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The BMW Range
5 Series
E39
Vanos Failure
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<blockquote data-quote="B33mEr" data-source="post: 402819" data-attributes="member: 13609"><p>Totally agree with bro pussy and bro jaleeks ... The main cause of early VANOS failure is due to long oil change interval (OCI) ... But i do have to say that diagnosing a worn out VANOS seal is very hard ...</p><p></p><p>A quote from Beisan regarding fault codes to look out for that may be due to worn out VANOS seal:</p><p></p><p><em>In some cases the engine computer will generate a fault code. The code is usually associated with the vanos exhaust side. This is due to the powerful spring in the vanos exhaust cylinder which forces the piston out. Fault codes include:</em></p><p><em>P1520 (BMW 104, 0x68): B (exhaust) Camshaft Position Actuator (faulty reference value).</em></p><p><em>P1523 (BMW 106, 0x6A): B (exhaust) Camshaft Position Actuator Tight or Jammed (mechanically stuck).</em></p><p><em>P1397 (BMW 18, 0x12): Camshaft Position Sensor B (exhaust) Circuit.</em></p><p><em>The exhaust camshaft position sensor (CPS) is a common failure. But if replacing the exhaust CPS (w/ OEM CPS) doesn’t work then it’s likely the vanos failure.</em></p><p><em>On 01+ M54 & M56 engine cars codes P1520 & P1523 were removed. Thus code P1397 appears.</em></p></blockquote><p></p>
[QUOTE="B33mEr, post: 402819, member: 13609"] Totally agree with bro pussy and bro jaleeks ... The main cause of early VANOS failure is due to long oil change interval (OCI) ... But i do have to say that diagnosing a worn out VANOS seal is very hard ... A quote from Beisan regarding fault codes to look out for that may be due to worn out VANOS seal: [I]In some cases the engine computer will generate a fault code. The code is usually associated with the vanos exhaust side. This is due to the powerful spring in the vanos exhaust cylinder which forces the piston out. Fault codes include: P1520 (BMW 104, 0x68): B (exhaust) Camshaft Position Actuator (faulty reference value). P1523 (BMW 106, 0x6A): B (exhaust) Camshaft Position Actuator Tight or Jammed (mechanically stuck). P1397 (BMW 18, 0x12): Camshaft Position Sensor B (exhaust) Circuit. The exhaust camshaft position sensor (CPS) is a common failure. But if replacing the exhaust CPS (w/ OEM CPS) doesn’t work then it’s likely the vanos failure. On 01+ M54 & M56 engine cars codes P1520 & P1523 were removed. Thus code P1397 appears.[/I] [/QUOTE]
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