codes p0141 and p0161
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codes p0141 and p0161
I know these codes have threads on them already but the question that i have relates to the pcm. the codes refer to the o2 sensor heater circuit. I was checking the sensors yesterday and the voltages going to the sensors i checked the bank 2 front and found the wire that is supposed to provied ground from the pcm was supplying 12 volts thereby not completing the circuit. i ohmed the wire to the pcm and it was good. am i looking at a pcm replacement? anything else that i could look at?
thanks
1998 F150 4x4 4.2 v6 manual 5 spd standard cab 6.5 ft box XL no AC
thanks
1998 F150 4x4 4.2 v6 manual 5 spd standard cab 6.5 ft box XL no AC
Logistics Pro
Joined: Jan 2001
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From: Central NYS
the question that i have relates to the pcm. the codes refer to the o2 sensor heater circuit. I was checking the sensors yesterday and the voltages going to the sensors i checked the bank 2 front and found the wire that is supposed to provied ground from the pcm was supplying 12 volts thereby not completing the circuit. i ohmed the wire to the pcm and it was good. am i looking at a pcm replacement?
And ditto what bluegrass said. Those codes pertain to the downstream sensors.
Lead Driver
Joined: Sep 2006
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Again, both codes are for the rear sensors not the fronts.
There is 'no' 12 volts from the PCM.
The voltage is supplied through fuse#23.
The PCM only supplies a ground then monitors the voltage and current for a fault. This is how those codes were set.
If the circuit were grounded 'ahead' of the heater it would blow the fuse and you would have a long list of codes.
The circuit is either grounded 'after' the sensor or the circuit is open at some point from the sensor toward the PCM..
You must see that in the design of the system you would never want the PCM to supply 12 volts because a short would risk damaging the PCM un-necessarily where a ground out or open will only generate a code.
My long guess is the leads are cut/open at some point since it is affecting both sides.
Let us know what you find.
Good luck.
There is 'no' 12 volts from the PCM.
The voltage is supplied through fuse#23.
The PCM only supplies a ground then monitors the voltage and current for a fault. This is how those codes were set.
If the circuit were grounded 'ahead' of the heater it would blow the fuse and you would have a long list of codes.
The circuit is either grounded 'after' the sensor or the circuit is open at some point from the sensor toward the PCM..
You must see that in the design of the system you would never want the PCM to supply 12 volts because a short would risk damaging the PCM un-necessarily where a ground out or open will only generate a code.
My long guess is the leads are cut/open at some point since it is affecting both sides.
Let us know what you find.
Good luck.
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