Re: Code 91, O2's again??? WTF???
Few things to consider. (1) Don't try to do resistance tests to check for O2 health. You'll short the O2's out with the high impedence. (2) Common things will shorten their longevity....RTV, antifreeze, and leaded gas are just a few. (3) Poor grounding will increase the resistance of the heater circuit and kill them quicker. (4) Exhaust leaks near the reference source will lead to near zero voltages.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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