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Originally Posted by LouLou
Hi
When the light it on it seems a bit sluggish acceleration wise but I may be imagining this I suppose. It definitely uses more petrol.
I was told the o2 sensor manages something to do with the o2/fuel ratio and this is why it may use more petrol. But It would not do the car any damage at all.
I hope you get your problem diagnosed soon.
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If the O2 sensor fails then the ECU uses a "limp Home" value for the fuel /air ratio, which is rich.
This would make the car sluggish and use more fuel.
A rich mixture and a lean mixture cause damage, with the rich mixture being the lesser of the two evils.
Lean mixtures burn valves and pistons, whereas a rich mixture causes soot that gets into the piston rings and cause cylinder and piston wear.
Some fuel additives can cause problems with the O2 sensor.