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Old 08-28-2012, 08:26 AM
jjpumphrey jjpumphrey is offline
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Default O2 Sensor monitoring

Hello,
I have a 2001 Ram 1500 that I am having some problems with resolving a O2 sensor reading. I have a OBD2 scanner that I am using to watch the live data stream and in watching the O2 signal I see it flatten out and hold around .6 volts, this seems to happen once I am on the freeway. I have seen the signal resume normal switching on its own and also when letting up off the gas pedal. When sitting in the driveway I rev'd up the engine to 1800 RPM and watched the O2 signal, it switches but the waveform is a bit eratic and the rpm's fluctuate +-100 rpm. Does anyone have any ideas as to what I can look for that would cause this?

Thank you in advance for any assistance on this.
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Old 08-28-2012, 12:07 PM
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Could be a sensor about to fail, bad pig tail, short in harness. Any one of those could be a possability. Espesely a short or a melted spot in wires. Not located in a cool spot next to trans and going into a hot pipe.
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