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International Automotive Technicians Network
Re: Can an O2 sensor cause poor fuel economy?
Posted to Technical Theory Forum on 8/14/2007

Yep. OBDI had much more limited lambda sensor capabilities, so I believe you. The OBDII system is much better in detecting poor fuel control, and that was what my response was directed toward.

I just have a hard time believing that an OBDII equipped vehicle ... Login to read more.