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| Idling revs, ignition timing and CO content cannot be adjusted. |
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| Idling revs are regulated to target values by the throttle valve drive in conjunction with the DIS function (digital idling stabilisation). |
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| CO content is adjusted to the target value by lambda regulation. Through self-diagnosis possible faults in lambda regulation are found and stored in the fault memory. |
| Special tools and workshop equipment required |
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| Fault reader -V.A.G. 1551- or vehicle systems checker -V.A.G. 1552- with lead -V.A.G. 1551/3B-. |
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