P1647, Any Help it's not the O2 Sensor
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Joined: Oct 2005
Posts: 199
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From: Southwest Pennsylvania, U.S.A.
RE: P1647, Any Help it's not the O2 Sensor
Here are the other two options for the P1647 code.
The HO2 sensor 2/1 sensing circuit: short circuit to ground, short circuit to high voltage, open circuit.
ECM failure.
The HO2 sensor 2/1 sensing circuit: short circuit to ground, short circuit to high voltage, open circuit.
ECM failure.
Senior Member
Joined: Oct 2005
Posts: 199
Likes: 11
From: Southwest Pennsylvania, U.S.A.
RE: P1647, Any Help it's not the O2 Sensor
Tony,
H/W is the answer from a tech as to checking the HO2 sensor.
Hope this helps....
H/W is the answer from a tech as to checking the HO2 sensor.
As the O2 sensors have been changed, next step is to test the connection to the ECM (he should measure the wire impedance*), and if this is ok, then I'm afraid the ECM may have a problem, which is rare but happens some times...
*Don't know precisely the wire impedance, but there's no need to finely analyse the values: it's just to see if the signal can be distorted by a problem on the cable or if the cable is ok.
*Don't know precisely the wire impedance, but there's no need to finely analyse the values: it's just to see if the signal can be distorted by a problem on the cable or if the cable is ok.
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RE: P1647, Any Help it's not the O2 Sensor
Ey up,
I have P1646 fault which is sensor 2 bank 1 so you may have changed the wrong sensor if yours is P1647 ?
(Linear O2 sensor control chip for bank 1 was other fault which was caused by same faulty sensor).
Good luck with it.
I have P1646 fault which is sensor 2 bank 1 so you may have changed the wrong sensor if yours is P1647 ?
(Linear O2 sensor control chip for bank 1 was other fault which was caused by same faulty sensor).
Good luck with it.
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