coug66

see the problem code here, I am wondering if I have a bad 02 sensor?

Symptoms,

car starts and drives fine, the occasional coil failure but then the constant

P0430 code.

I then do a test and the

TID 01 CID 02
rich to lean sensor threshold voltage ( constant)
max 128
current 161

I have put a spacer on the secondary O2 sensor under the passenger seat. I replaced the catalytic converters about 15K ago.

I replaced the passenger side upstream O2 sensor above the Cat 1K ago.

Do I need to replace the downstream O2 sensor?

does the report reveal its failing?

It cant be the cat its too new and I put a spacer in?

The below screen shots were taken before and after spacer, and upstream O2 sensor? same readings just a little different?

It looks to me like a sensor is bad?

I can reset and drive for a while but It after some time comes back with codes.







solved this with this

coug66

sorry this is essentially the same post as before


https://www.clublexus.com/forums/ls-...o2-sensor.html


what I am after is what does this mean and which 02 sensor is it reporting?

its too rich or too lean? Can it be an 02 sensor failure since I spaced the secondary 02 sensor away from the stream?

coug66

The numbers seem to be similar , I went from 178 to 161 with the spacer.

The P0430 came on before and after the spacer install.

I realize it could be a bad cat but I was hoping the spacer would take it out of the mix?

Can this readout come up with a spacer and a good O2 sensor?

I want to make sure I don't have something like coils or EGR valve causing the problem and I am not looking in the right location.

Is this code to do with the back 02 sensor? which would be OK because it wouldn't affect drivability.

I have replaced the other bank coils with non denso coils recently. The bank two is all denso.

I did have a code pop up for coil 1 bad, I reset and it went away? runs fine except for PO430.

coug66

I AM IN THE PROCESS OF DRIVING AND TAKING SCREEN SHOTS.

thank you so much opening up my Torque understanding. I had no idea how to access the displays before you posted that picture.

Thank you!!!!!!!

coug66

coug66

do I have the spacer on the correct side? Passenger?

I also stopped and replaced the cyl 1 coil and then immediately afterwards the cyl 8 coil signal tripped when running a scan.

I think cyl has a brand new denso but for sure it ha a brand new coil from napa.

the coils are acting really strange. I am going to see how many non denso coils I have and buy new denso coils to eliminate the issues.

just spent over $200 on three coils from NAPA. ANd yet I am still getting these coil codes popping one after another not at the same time.

I erased the codes and all I have is the P0430 again.

coug66

coil codes are constant coil failure. I have replaced 14 coils in my car in the past couple of months.

4 never worked return the 8 to ebay seller. I had 8 medium priced coils fail within a little over a month Ebay.

I replaced with 3 coild from Napa and also been putting in denso for all future coil failures.

example, coil 1 failed or gave bad reading. immediately after replacing up pops coil 8?

I think 8 was replaced about 2 months ago but not with a Denso. I will have to look at coil 8.

I just don't know why a coil doesn't show up until another coil is replaced?

I went through 4 failures in one day. So yes I am trying to get to the bottom of the P0430 but the coil issues have been constant.

I am going to buy 3 more Denso coils for when the non Denso fail from here on out.

coug66

Bank two on the original cats was bad missing big chunks? from the look at my readouts I have no active cat working on bank two.

I was hoping the extender with the second O2 sensor would fool the computer.

I wonder if I have issues with my fuel trims? or too little air or something like that? I didnt have codes for a while after changing the cats.

I am going for a drive to heat the cats and o2 sensors up and will do a engine warm idle test.

coug66

my read outs on the O@ sensors look bad on both sides so I don't know why only one bank is ready bad?

I think my cheap failing coils have run too much unburnt fuel through the cat or cats and prematurely burned them out.

I am just going to drive it as is as the cat cods don't affect performance.

I am a little surprised the spacer didnt work? I also could have a air leak but nothing has shown up yet.

I am going to order a few more coils for the trunk and replace when the codes pop up.

My guess is going cheap on the coils was the last thing I ever should have done.

Aus430

those positive ltfts suggest the computer is adjusting for excess air. a leak perhaps but could be other things, possibly vvt solenoids playing up, masquerading as misfires.

basic checks.
How does the MAF reading look?
Also key on engine off, does the tps reading opperate as expected?

if those are working, it can you record a trip with tps, temp maf, ltfts and the voltage readouts from all the o2 sensors

before condeming coils, did you move them to another cylinder to see if the miss moved with it?

coug66

of course I bought super cheap vvt solenoids. buying cheap sucks because then you cant rule out relatively recent replaced parts.

I appreciate the followup I have been busy and will check these issues soon.
thanks again
Ian

coug66

Well its all fixed and working now. no check engine codes.

I had issues with my passenger side catalytic converter due to bad cheap coils.

I installed spacer and it didnt work but then I installed a spacer with a mini CAT in it.

https://www.ebay.com/itm/90-O2-Oxyge...t/183907893717

car runs great no codes and no issues when I pull O2 tests.