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If it is a Bosch LH 3.2 Jetronic System 221 =long term fuel mixture too weak in part load stage

If it is a Fenix 5.2 System 221=Lambda Operation; also Heated oxygen sensor (mixture too rich under part throttle)

/ long term fuel mixture too weak in part load stage

depending on the type of Volvo (model) can be caused by various problems

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