1998 Ford Taurus Oxygen sensors

Tiny
RDELE
  • MEMBER
  • 1998 FORD TAURUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 78,000 MILES
I replaced two oxygen sensors due to fault codes.
Replaced Bank 1 sensor 1 and Bank 2 sensor 1.
Now I am getting fault codes on all 4 oxygen sensors.

What now?
Clean MAF sensor?

I replaced the PCV valve and hose connected to it.
I checked for vaccuum leaks with propane and found none.

Any other ideas?

Thanks
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Tuesday, October 20th, 2009 AT 7:48 PM

5 Replies

Tiny
BMRFIXIT
  • EXPERT
What is it you have for codes
check fuses
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Wednesday, October 21st, 2009 AT 6:26 AM
Tiny
RDELE
  • MEMBER
I got the oxygen sensor circuit malfunction codes.
P0155 P0161 and I erased the other two. I'm sure they will come back on when I drive the car.
How do you troubleshoot the circuit?
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Monday, October 26th, 2009 AT 4:12 PM
Tiny
RDELE
  • MEMBER
P0155
P0161
P0135
P0141
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Friday, October 30th, 2009 AT 9:16 PM
Tiny
BMRFIXIT
  • EXPERT
Check fuses and check for missing fuses

DTC P0135, P0141, P0155 Or P0161

DTCs received separately indicate a short to ground or open circuit in HO2S heater circuit. DTCs received in pairs, such as P0135 and P0155 or P0141 and P0161, indicate HO2S heater circuit is shorted to a power source of more than 2 volts.
DTC P0135 is for HO2S 11.
DTC P0155 for HO2S 12.
DTC P0141 for HO2S 21.
DTC P0161 for HO2S 22.
Possible causes are:
Signal shorted in wiring harness or HO2S.
Water in connectors.
Cut or pulled wires.
Open in GND or VPWR circuit.
Corroded terminals.
Faulty HO2S heater.
Inspect HO2S connectors for loose, damaged or corroded terminals. Repair as necessary
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Friday, October 30th, 2009 AT 10:19 PM
Tiny
RDELE
  • MEMBER
This is all good advice and I am still checking things. I can't find any place where wires are burnt or melted. I have checked the connectors for water, bent terminals, bad wires, etc. No corroded terminals.

How do you check for a short or a bad ground?
How do you check for a faulty H02S heater?
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Tuesday, November 3rd, 2009 AT 11:57 AM

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