I have a 97 taurus 3.0 ohv. Check engine light came on then it went out, I had it coded, a error code of po161 o2 sensor bank 2 sensor 2 is what it says. I replaced the sensor with a new one and the light has now came on again and will not go off. I had it coded again and it still has po161 code. I know this car has 4 sensors. I want to make sure which one it is. So could someone help me on this issue.
Thanks

 

Hello and good day to you:

Lets reset the OBDII codes....Disconect the Neg (-) Cable to the Battery...Leave it off for 5 to 10 min's...This resets the PCM module.....Start car...Drive it for a few.....it should stay off...

If it comes back on please advise...good luck

 

Ok I removed the negetive cable and cleared the error message. Drove the car about 5 miles no problem. After couple of hours drove the car around about 10 miles and check engine light is now back on. Had engine coded again it comes back PO 161. Which according to the people at autozone is o2 sensor bank2 sensor 2. So I'm back where I started.

 

that oxygen sensor would be located upstream from the catalytic converter (on the exaust manifold front side of the engine)

http://www.fordforums.com/f138/diffi...sensor-162445/

 

That sensor(number 2) is behind the converter. It will be on the exhaust that is coming from the front of the engine.(Bank 2) Look for bad wires or connections also.

 

 

Ok guys I have now replace both front and rear sensor. I will check for bad wiring and connector. But from my first inspection they looked ok. Since I'm an electrician by trade I believe I'm qualified to tell if the wiring or connector is bad.Will double check again just in case I missed something. The other thing I failed to state was I replaced the engine with a remanufactured engine. The check engine light came on after driving the new engine afew miles. Then in a day or so it went out. That's when I had it coded the first time andthe code po161 came up.

 

Hi Did you ever find out what caused your problem?
I have a similar situation. replaced mey engine with a salvage unit and now have codes 141 and 161. No codes before engine replacement. Checked wiring, no broken or disconnected wires. runs fine otherwise.

Thanks for your help.

 

No offence meant, but this is microvolt electronics. An electrician is a specialist in electrical, not electronic. They are separate areas with some overlap. An electrician is not usually an expert on micro-volt technology nor on digital technology. You are trained to work on a 20 amp 240 volt sine wave line, but not a 5 miliamp, half volt sensor that uses pulse modulation.

If this were mine, I would obtain a code reader than gives real-time readouts of all the sensors. I would then check those readings at idle and at 2-3K engine speed. I especially would look at all four 02 sensor readings and at all four fuel trim readings.

FYI, if the fuel trim is over 20, combined fast and slow, at idle and it is closer to 10 at 2-3K, you have a vacuum leak. My 2004 was 25-30 at idle and 10-15 at speed. My problem was a vacuum leak. Bank 2 is the front of the car. I used four code readers. The first wouldn't even link. The second read only one code. The third read that same one code. The fourth one read two codes.

The intake manifold gaskets are also prone to leaking air on the Vulcan engine. I found a LOT of people who claimed to be big experts on this subject that were totally off base. They assumed that the part that they usually found was defective was the cause in every case.

I got my information from a couple of TSBs and a white paper written on the subject of fuel trim. The shop that did the work that resulted in the loose vaccum hose wouldn't even diagnose the problem because of the electronics involved. They recommended a shop down the street because the owner there has a college degree in electronic engineering.

 

The error code Error Code=20998 comes up on my treo 650 when trying to sync the calendar. Contacts and everything else syncs great any help?