Thanks Larry..

My MPG had dropped pretty low in recent weeks, down to about 16mpg and I figured it was my O2 sensor going bad even though check engine light didn't come on. I replaced the O2 sensor and mileage appears to be back to normal but I won't know for sure until the whole tank is used.

I checked other sensors (temp sensor, coolant temp sensor) and they checked out ok. Lambda is next, and I'll adjust it if it needs to be, then EHA. I figure I should be getting at least 20/21 mpg in city/hwy mixed driving.

I'm just now getting the hang of using this handy multimeter -- great tool to keep your fuel system optimized

Take care,

~Paul

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'91 300E, 215K miles