I am getting a code for O2 sensor bank one sensor 1; which one is it? The car is a 1999 C43

thanks

Right front...

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drivers side or passengers side?

The steering wheel is on the left.

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John Shellenberg
1998 C230 "Black Betty" 240K

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You never use driver/passenger for chassis orientation...what if a guy had a RHD car???

Anyway.....the rule is right/left taken from the driver/operators position.