P0174 (corrected)

infj23

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#1
Make
Lexus
Model
ES 330
Year
2005
Miles
374000
Engine
V6
05 Lexus ES330
After my recent, long-running Saga of eventually needing to replace my oxygen sensor on bank 2 Sensor 2, I now getting code p0147. Looking on the internet tells me that has something to do with bank 2 sensor 3, but I don't see that my car has a sensor 3 on either Bank. Car is running a little rough at idle and performing well at cruising speeds. I am losing about 4 miles per gallon in fuel economy. Any ideas?
 
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#2
Confirm that is P0147? could this be P0174?

I do not remember a p0147 at all any model IDK advise
 
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#5
vacuum leaks use the old school carb spray trick, bank 2 is front bank.
 

infj23

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#7
Just drove another three hundred miles and check the codes again. Now I'm getting code P 2231.
Could I have caused this problem when I was using piercing probes to check the continuity of the wires going to the ECM?
 

grcauto

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#8
Spray carb cleaner or use a propane torch (unlit with gas on) and go around the area of the intake where it seals and see if the idle changes. If so, you found your vacuum leak. Propane is a little safer than carb cleaner. P2231 is for a shorted O2 for bank one. Are you sure your code is correct? A bank two code would make more sense. But then again we are talking automotive technology....YIKES
 

infj23

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#9
Update!
I do enjoy a good cigar. I did not particularly enjoy using the cigar smoke method to try to find a vacuum leak. Too much puffing too fast! And, to make it worse, the smoke did not help me find a leak.
However, in the process of doing this, I saw two things. First, a hose I removed to check had a crack in it. I probably made that crack while removing the hose, so that may not have been the problem, but I replaced the hose with new. Second, there appeared to be a little wiggle/play in the oil filler cap, so I replaced that. The new cap fits much more snuggly. Could that have been my problem (I think so!).
A few days ago, I watched the O2 sensor readings as I drove. Cruising at 55mph on level ground, the downstream sensor on Bank 1 stayed at about .5 volts. The Bank 2 sensor (the problem identified by the code) stayed in the mid .8 range (fluctuating only a little between 8.2 and 8.6ish).
After today's two changes, the Bank 1 downstream sensor numbers were about the same. the Bank 2 downstream number fluctuated as low as .15 and as high as .65, usually close to .55. So this appears to be a big difference in performance of the Bank 2 downstream numbers.
I have only driven about 12 miles but no CEL.
You can watch a thrilling, 21-second video of my scan tool here:
Can I claim victory? Does this sound like a fix?
Thanks to all!
Doc
 

infj23

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#12
Mode 6 is new to me. I looked around on my scanner and found this. Is this the Mode 6 you were asking about? I'm not sure what any of this means.
Thanks!
Lexus Mode 6.jpg Lexus Mode 6.jpg
 

grcauto

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#13
That's a hexadecimal and the tool shows Test $06 which would be mode 6 data. You need to decipher the codes.
 

infj23

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#15
Update: either that weren't it (as Curly on the 3 Stooges used to say), or something changed. I am still getting the same P0174. Now, unlike my recent video, the B2S2 oxygen sensor is now saying about .9 all the time. If cruising at highway speed and I come off the throttle to slow down, it will go to 0. Otherwise, it pretty much stays at about .9 now.
I looked and could not find a vacuum leak. Any other ideas?
Thanks!
David