355 5.2 OBD codes: 0422,0432,0153,1121

In the spirit of beating a dead horse until it is actually dead (LOL), here is a pic of the other pre cat sensor I received, again, directly from Bosch.
Both have the EXACT numbers on the case, identifying them as the correct 13819 pre cat sensor This is the one that looks correct:

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I guess mistakes happen.......I am glad I listened to you guys and removed them. Since the heater ohms were both at 3.7, I thought it wouldn't matter, and I threw them in.

^^^This explanation makes good sense.....and that's why I pulled them back out and ordered 2 new ones. Thank you.

 

Raise your hand if you are holding your breathe....LOL

Perhaps it sounds silly, but I am glad you were able to get open circuit reading. Allows you to move forward and get that sorted. Did it finally throw a permanent code?

 

^^^^^ LOL I read that one wrong....ha ha Just painted my heater shield: paint must be making me dizzy. At least, that excuse sounds better......

 

Installed new 13820 post cat sensors; both heater circuits ohm at 2.2. Waiting for another set of 13819 pre cat sensors.

FWIW: spoke with Bosch tech with 40 years experience who could not explain the different tips on my 13819 sensors that I have since removed;
here they are side by side:
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He was unable to explain the reason for this mistake, had never heard of this before, and was stumped. He also could not explain the specific reason for the different tip designs, but I think Ian gave the best explanation. I forwarded this pic to the Bosch tech who is going to send it higher up.......

He did say he would not use the mismatched set.

 

Agreed. Especially, since the ohms reading is correct. No idea how the sensor would behave with the wrong tip, but clearly there would have been a difference...

 

Replacing all 4 O2 sensors seems to have corrected my O2 codes. no more: -0153 -0159 -0133 -0139 -1121

Bosch sent me 2 additional pre cat sensors and they both have slits! ALL GOOD. Moving on,......

For the moment, I believe I have a good idea of what is happening with my current codes, but could use some more educated opinions:

My scanner has set all tests solid green, which means all tests are complete and in addition, it displayed freeze frame data, which I have never seen before. No idea how to analyze the FF data. Current codes are:
-1148 stored
-0422 stored
-0432 stored
-1148 pending??

how can a code be both stored and pending?? My bypass valve is working fine, and vacuum is not an issue, so I feel confident that swapping either the thermocouple and/or the TCU will correct this one. 0422 and 0432 must be present due to the fact that I have bypass pipes. Going to experiment with 90' spacers and see if that fixes the issue.

FWIW: here is my FF data for stored codes; looks fine to me?

Fuel sys 1 closed loop
Fuel sys 2 closed loop
Calc load 14.9%
Engine temp 189'
STFT bank 1 0.0%
LTFT bank 1 0.8%
STFT bank 2 -1.6%
LTFT bank 2 0.0%
Engine RPM 3125
Vehicle speed 17 mph

Appreciate any input.........thanks

 

OK got it.....just ordered the 90' units. should I install on top of the Big Daddies mini cats or take those off and install solo?

Egg on my face, i have 1448 (NOT 1148) which is for bypass flap. sorry about that.....

that's why I wrote this in post 87:

"My bypass valve is working fine, and vacuum is not an issue, so I feel confident that swapping either the thermocouple and/or the TCU will correct this one."

 

^^^^^thanks....will do....

any tips/tricks on access and removal of the 2 RH TCUs? Easier thru engine bay, or underside? They look a little buried.......

 

moving along......
in an attempt to clean up the 0422 and 0432 codes, I purchased a pair of 90' angled O2 spacers from Big Daddies and added those to the existing BD straight mini cat spacers. After clearing the codes, both came back after only a 2 minute drive.....?????? A few posts suggest a pre CAT exhaust leak, but I don't see any issues with my exhaust...can a vacuum leak be at issue? I mention this because when coming to a full stop, my car will surge about 200 RPM for about 3 seconds and then settle back.......not even sure if this is a problem, but reminds me of another car I have with a vacuum leak. That car would serge a good deal more than 200 RPM........grasping at straws...

Any other ideas? Seems like it is quite common for those that installed bypass pipes, but most report the issue goes away with spacers? I don't think I have any problem with my car; she runs great, but I would prefer to get this resolved properly........unless there are others that were never able to get rid of these codes????

 

Certainly willing to give that a try, but not comprehending the logic: With no spacers on the post O2 sensors codes 0422 and 432 (bank 1 and 2 CAT inefficiency) were present. Big Daddies marketing sold me on the straight mini cat extensions because they claimed to have a honey comb precious metal construction that mimic a full size CAT. After installing those, same codes came back. Now I have the angled units in first, next the straight mini cats, and finally the new post O2. Seems that the codes came back on much sooner than before.

If the main issue is the fact that the post sensors are looking for a cleaner sample of air that does not exist without CATs and a straight Fabspeed pipe, are you saying that the sensors are not tasting enough of that bad sample? So the optimum set up has to do with the proper distance away from the exhaust stream? I would assume that stacking the spacers wouldn't matter, but perhaps it does? The angled spacers alone solved your issue?

 

ok....will do. Thanks