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Old 10-07-2008
Thread Starter
Join Date: Sep 2008
Location: Holt, Missouri
Posts: 4
HO2S resistance specification

Last week, my 99 Ranger gave me the check engine light with 4 codes, 1409, 1451, 0135 and 0141. After a little searching through this forum and other web resources, I found the fuse that supplies power to these items (EGR regulator solenoid, EVAP control solenoid and both O2 sensors) and found it was blown. I replaced the fuse and it blew shortly afterward.

Both solenoids show resistance readings within specifications, so now I suspect one of the O2 sensors may have a shorted heater. What should the resistance reading be for these and does anyone know what pins on the connector are for the heater elements?

Any assistance in troubleshooting this would be greatly appreciated. My gas mileage is suffering from this issue.


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Old 10-21-2008
Thread Starter
Join Date: Sep 2008
Location: Holt, Missouri
Posts: 4
I finally determined which component was blowing the fuse by process of elimination and going through several fuses. Disconnecting one item at a time then starting the vehicle. O2 sensor before the converter was blowing the fuse.
Now comes the fun part, getting the old sensor removed. 186K miles on this truck and it's not wanting to let loose.
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Old 10-21-2008
Join Date: Nov 2005
Location: Elizabeth City, NC
Posts: 767
Rent/borrow the O2 sensor socket at the AP store.

Try removing it cold, then various degrees hotter (run the engine to heat it up).

Mine are remarkably accessible with the fenderwell liner removed.
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