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Registered
Join Date: Sep 2000
Location: Grand Rapids, MI , USA
Posts: 380
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From reading the O2 sensor info at work (NAPA Auto Parts) I found out that the heater on the O2 sensor is supposed to bring it up to operating temperature, so it shouldn't really need exhaust heat to operate fully. The O2 sensor is installed in the #4 exhaust runner.
I have the stock 1.7 D-Jet with a rebuilt MPS which was tested by Jeff Bowlsby and he found it to be fully functional.
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