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  #1  
Old 01-30-2017, 07:50 PM
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O2 sensor problems

Is it even possible for an OBD-II sensor to give high and low voltage reading on the same bank and sensor?
If so, what's the problem and how do I fix it???

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  #2  
Old 01-31-2017, 08:42 AM
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Re: O2 sensor problems

Welcome to the garage.
What are the fault codes you have?
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Old 01-31-2017, 09:30 AM
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Re: O2 sensor problems

I have codes:
152
135
141
155
161
158
876
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Old 01-31-2017, 01:20 PM
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Re: O2 sensor problems

Quite a bit of codes. I would first have a look at the wires of the O2 sensors, especially where they run close to the exhaust. When the wire touches the hot exhaust, the isolation will melt and it could cause a short. This could first generate a high voltage (due to the heater wire feeding the sensor wire) and then probably causing the fuse to blow, giving the low voltage message. If the wiring seems to be ok, then check the fuse #16 in the PDC under the hood. If this one is ok as well, then errase all DTC´s and test drive, to see if some or all come back.
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Old 01-31-2017, 03:57 PM
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Re: O2 sensor problems

Thank you, sir. I'll do just that. I appreciate it!!!
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Old 02-12-2017, 07:29 PM
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Re: O2 sensor problems

Well, I finally got under it and found out that even though it HAD Cali emissions, (4 O2 sensors), obviously, the person I bought it from replaced some exhaust lines and only left 2 of the O2 sensors! I'm not sure exactly where the 2 missing sensors are supposed to be located, or I would just drill out the holes and insert the missing sensors.
Any thoughts???
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Old 02-13-2017, 05:37 AM
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Re: O2 sensor problems

Is it a 4.0 or 4.7?
Either way, they both should have two sensors before the mini cats and two sensors after the mini cats. Or did they remove the mini cats?
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