I have ran the codes on my 1995 Ford 3.8 GL Taurus. The codes said: (oxygen sensors). I then found out there are two oxygen sensors, how do I know which one I need to replace or do I need to replace both of them at once?
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bank 1 exhaust is the rear manifold towards the windshield side. Follow the exhaust down. There should be one oxygen sensor before the catalytic converter and a monitor after the catalytic converter. Be Careful.. they look the same.
Whenever I get a vehicle in that "sputters" the first things we check is the fuel filter and pressure on the fuel pump. With the 1995 and newer cars the computer will kick out error codes if the oxygen sensors are defective.
The heading says2000 taurus and 1999 taurus. I looked up the wiring for a 1999 taurus. Fuse #28 goes to the heated oxygen sensors and the canister vent solenoid. You have 2 oxygen sensors (green connectors)and 2 catalist monitors(blue connectors) that use this fuse for the heaters that are in the sensors. I would check these sensors to see if any of their wiring is shorted. I have seen in the past where oxygen sensor wiring would rub on a front drive axel and wear thru the wire insulation causing a short. You really need to look at all 4 sensors and their wiring closely for shorts. If they look ok then disconnect all of them and reconnect 1 by 1 until fuse blows again. Fuse #28 also powers the canister vent solenoid which is located under the trunk (under the car) in a black plastic housing (approx 1ft by 1ft). It is the only item with wires going to it. If you disconnect this and the fuse stops blowing then it is shorted. Also check the wiring to see if it rubs or is shorted anywhere.
Hope this helps
On you engine there are 4 Oxygen sensors. 2 Pre cat sensors( upstream) and 2 post sensors (down stream). There are 1 pre and 1 post sensors for each side of the engine. If further assistance is needed, please leave me a message here. Craig
What was the letter in front of the 0420 (i.e. P or B) if it was a P then the code is for a catalytic effenciency code. this usually caused by a lazy or an O2 sensor that is going out, or the catalytic converter itself is going out. The only way to really find the problem is to hook it up to a diagnostic code reader and monitor the O2 sensors for their flucuations and see if one is not lazy or not reading at all, if the sensors are flucuating then i would lean towards a catalytic converter. Hope this helps you out.
you need to borrow the oxygen sensor wrench from autozone or whereever you bought the sensor.
Section 03-14: Engine Controls, Electronic 1996 Taurus, Sable Workshop Manual
REMOVAL AND INSTALLATION
Heated Oxygen Sensor (HO2S)
SPECIAL SERVICE TOOL(S) REQUIRED Description Tool Number
Oxygen Sensor Wrench T94P-9472-A
Removal and Installation
Disconnect battery ground cable (14301). Refer to Section 14-01 .
On 3.0L (4V) engine remove cowl extension and right side of leaf screen.
Disconnect engine control sensor wiring (12A581) from heated oxygen sensors (HO2S) (9F472). Do not remove harness connectors from the brackets.
Raise vehicle on hoist. Refer to Section 00-02 .
NOTE: If excessive force is needed to remove a heated oxygen sensor, lubricate the heated oxygen sensor with penetrating oil prior to removal.
Remove heated oxygen sensors from exhaust manifolds (9430) using Oxygen Sensor Wrench T94P-9472-A.
To install, reverse Removal procedure. Apply a coating of anti-sieze compound to threads of heated oxygen sensor. Tighten heated oxygen sensors to 34-46 Nm (26-34 lb-ft).
there are two O2 sensors on this engine. Both are mounted in the exhaust just past the exhaust manifolds. You will be able to replace them without a lift. You will probably need an O2 socket to remove them. They usually are in pretty tight.