Another O2 sensor Problem! - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 09-07-2007
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Another O2 sensor Problem!

So I got a P0153 code. I removed the driver side sensor and replaced it. I hooked up an ODB scan tool and I got 0 volts for the sensor I changed. See below:



Does anybody have a wiring diagram so I can trace the wires to see if I can find a break?
If you guys have another way to go please let me know. Thanks for the help.
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Old 09-07-2007
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year make model engine size, 8th digit of the vin?

i have a diagram but seem to have forgoten how to do print screen
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Old 09-07-2007
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1998 Ranger XLT Vin Code X 4.0 eng
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Old 09-08-2007
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There are 2 wires for the front DS O2 sensor: orange (signal return) and red/black (signal).

Orange is a dedicated sensor ground from the PCM and it is used for several engine sensors including the other oxygen sensors. The orange O2 wire is spliced to a group of other orange wires inside the harness. Unless it is cut on the short branch to the DS O2 sensor, it is OK.

The red/black signal wire should be checked for open and short to ground - either can cause a 0v reading at the PCM. Disconnect the sensor and the PCM before running continuity checks.

It is a short run for both wires from the sensor directly to the PCM connector. The only intermediate plug connector is the one on the sensor itself.
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Old 09-08-2007
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I checked the wiring and it looks ok. I got a ground on the orange wire and I got continuity on the red/black wire to the PCM connector and no short to ground.

Now what?

Could it be that I got a bad O2 sensor?

Is there a way to test the sensor? Maybe I just will return it and get a new one.

Last edited by smallello; 09-08-2007 at 09:19 PM.
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Old 09-08-2007
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Any one have any other ideas?
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Old 09-09-2007
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If the wiring and connectors are OK, then the only things left are the PCM and the oxygen sensor. Chances of the PCM causing this are just about zero.
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Old 09-09-2007
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The new sensor is in and working fine! Guess I got a bad part after all.
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