Bank 2 sensor 2

[bigryry]

I did the Isolator/plentum fix last year. I also replaced the MAS, all the O2 sensors, and even one more today being sensor 2 bank 2 for a lean code.

What could be causing this? I hate these freaking lean codes with this windstar, they are so broad and could be so many things??

Check engine light is still on after erasing it from the shop..
Any suggestions?? Inspection is due this month

[serge_saati]

The O2 sensor 2 bank 2 is a dowstream sensor (after the catalytic converters no 2). It's the cat converter connected to front exhaust manifold. This sensor monitors catalyst efficiency.
It could be the O2 sensor, the wiring or the catalytic converter of front exhaust manifold.
Depending of which specific code for the sensor.
Do you have water drip under the exhaust system?

[bigryry]

Haven't noticed any dripping water, well it is snowing everyday so there is driping slush everywhere when we park.. But did not notice anthing dripping before it was snowing.

I put a new O2 sensor in today...

[bigryry]

The code is P0161, the sensor i think is fine, i checked #19 fuse, that was fine.. I put a new one in just becasue i had it out and had new ones..

Called a few mechanics and they have no clue, so i quess the last straw is chek the wiring.. I will have to have a shop do it.. It is supposed to be -25 tongiht, and it is 3 degrees right now...

Any other suggestion!!!!

[serge_saati]

Have you cleared the code after replacing the sensor?

If code come back, disconnect the O2 sensor harness, turn on engine and test the harness by checking for ~14V on two pins of supply voltage. There's 4 pins, so you should find them by luck. This electric supply is used to heat the sensor. It's important that the engine is running, otherwise you will not have negative supply from PCM.You may have another code because of disconnect, so you should clear it.

[bigryry]

I did clear the codes, 3 times now!! I will check that tomorrow, well my mechanic. I try to do all my work but it is 2 degrees and i'm not playing around in the cold and get frost bite.

[danielsatur]

Need to perform a Smoke Test to check for unmetered air leaks.

Bad upstream H02 sensors could cause lean codes, but not downstream H02 sensors.

[serge_saati]

Of course it's not a lean code.
P0161 is : Downstream Oxygen sensor bank 2 HEATER circuit malfuntion/low voltage
It's not a lean code.
But when O2 sensors are not enough hot, because a bad heater supply, they don't produce sufficient voltage, so a scan tool (not a simple code reader) detects a lean output. PCM don't like to see high oxygen after cat converter.

[bigryry]

We checked the wires yesterday and we have the correct power going to the sensor, so it is not a bad wire there.

I went to a different mechanic, it is my buddys girl friend's dad. I usually don't go there because of the distance 30 miles 1 way but he is good, I went there yesterday but ran out of time so i have to go back.

They check the connection to the sensor and hooke it up to a meter and it was in specs. they were thinking that maybe it was a bad line going from the sensor to the PCM, Could it be a bad PCM?

I don't know where to go, the stupid OBD will not link so it is shoot in the dark.

They did find a second code, i beleive it was a p0460. They said it was a sendor in the fuel tank.

[serge_saati]

No it's not a bad line going to PCM nor a bad PCM. Because you don't need a good line to carry the power, only for the signal. It's not the PCM, because PCM is sending supply voltage to the sensor.
I think you have a false code. Which scanner brand and model are you using?
Often, cheap scanner pull false codes. I know many Windstar drivers (me include) that pulled P0180, P0181, P0182, P0161 and find out after scanning with another scan tool that the actual code is P0171 and/or P0174.

For the P0460, it could be the fuel sender unit or the instrument cluster if your fuel gauge don't operate properly. Or it's a false code.

[bigryry]

Between 2 different shops they have tried 5 different scanners. The snap-on (large red scanner with handles on the side) read it and a cheap small one also read the code and the scanner at autozone. 3 different scanners all came with the same code.
I see ford has a TSB for the 460 code

My check engine light is on and the inspection is due. The codes have been cleared and the engine light always comes back on..

I wonder if i just need to bring this to the dealer

[bigryry]

I did do the isolator bolt fix last year, could they be bad again? Last year it was scanning the 171/174

[serge_saati]

I recommend you to have the live O2 data stream monitored with the pro scan tool. Ideally with a graph scanner. So you will know what output voltage you have after each four O2 sensors. With the four graphs data comparison, you'll have a clue of the problem.

[wiswind]

I know this is a LONG shot, but in your other thread, it was mentioned about a ABS module causing a issue with reading the code(s).
Wonder if you might disconnect the ABS module and see what you get with a scan?

Another thing, again a long shot.
When you changed "all the oxygen sensors" did you have more than 1 unplugged at the same time?
It is possible to plug them into the wrong connector down there, and I recall reading how crossing the plugs can send the best of mechanics in circles.
On my '96, I recall different color plugs, but they were identical, and could be plugged into the wrong sensor.

[bigryry]

Originally Posted by wiswind

I know this is a LONG shot, but in your other thread, it was mentioned about a ABS module causing a issue with reading the code(s).
Wonder if you might disconnect the ABS module and see what you get with a scan?

Another thing, again a long shot.
When you changed "all the oxygen sensors" did you have more than 1 unplugged at the same time?
It is possible to plug them into the wrong connector down there, and I recall reading how crossing the plugs can send the best of mechanics in circles.
On my '96, I recall different color plugs, but they were identical, and could be plugged into the wrong sensor.

I am going to try the ABS module (disconnecting)

When i changed all the O2 sensors last year was reccomneded by a local shop to fix the 171/174 code.. Then i found out about the isolator bolt fix.. There were no codes for about 7 months and then the P0161 code came on. We replaced the bank 2 sensor 2 sensor 3 weeks ago with no luck getting rid of the code.
So if it was a sensor in the wrong plug it wouldve shown up before and i asked the new mechanic to double check the connections on saturday and they said it looked correct.

I am wishing it was something simple..this is killing me