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How often to replace O2 sensors?

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Old 10-24-2013, 07:21 AM
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ML 430
How often to replace O2 sensors?
2000 ML430 196,000km
averages 17 liters / 100km driving around town & towing a caravan!
Without caravan 14.5 litres / 100 km & 20 litres / 100 kms towing!

How often do the exhaust O2 Sensors need to be replaced?

I have all the service records but I cant find any record of them being replaced!

Will it help my fuel consumption when they are replaced?
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