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lambda probe / 02 sensor 900

This morning my 'Lambda probe' dash light came on, just when the car automatically changed from unleaded fuel to LPG. When it does this fuel swap, the RPM drops for a split second because it has no fuel, but the engine does not stall. This is normal. But today the 'Lambda probe' signal came on when the RPM dropped. The engine still runs perfectly, but the light stays on. Can it be a faulty warning?

(By the way, I just had one power stage replaced because of a dead cylinder)

Uturn. 1992 965 LPi 285.000km.






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