Check engine p2198 p2196
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From: Portland, OR
Check engine p2198 p2196
Hello everyone, I am getting check engine for p2198 and p2196 on an 06 s. I am suspecting it is the pre cat o2 sensors have gone bad but before going out and purchasing new ones thought best to see if I can get a definite answer to if it is the o2 sensors. This is my first time trying to diagnose bad o2 sensors so forgive me if I am ignorant with the information. I finally got a foxwell nt680 pro so I am able to read the values of the sensors. I am not sure what the proper values the o2 sensors should be reading but here is what I am seeing at idle
Lambda cont correct behind cat bank 1 value 1.95
Lambda cont correct behind cat bank 2 value 1.95
Actual lambda value bank 1 value 0.93
Actual lambda value bank 2 value 0.93
Lambda setpoint upstream of cat conv b1 value 1.0
Lambda setpoint upstream of cat conv b2 value 1.0
Oxy sensor volt behind cat bank 1 value 0.071
Oxy sensor volt behind cat bank 2 value 0.071
Corrected sens volt ah of cat bank 1 value 1.22-1.26
Corrected sens volt ah of cat bank 2 value 1.24-1.255
If anyone can help decipher these values I would very much appreciate it! Thank you in advance for all the help
Lambda cont correct behind cat bank 1 value 1.95
Lambda cont correct behind cat bank 2 value 1.95
Actual lambda value bank 1 value 0.93
Actual lambda value bank 2 value 0.93
Lambda setpoint upstream of cat conv b1 value 1.0
Lambda setpoint upstream of cat conv b2 value 1.0
Oxy sensor volt behind cat bank 1 value 0.071
Oxy sensor volt behind cat bank 2 value 0.071
Corrected sens volt ah of cat bank 1 value 1.22-1.26
Corrected sens volt ah of cat bank 2 value 1.24-1.255
If anyone can help decipher these values I would very much appreciate it! Thank you in advance for all the help
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From: Portland, OR
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Joined: Oct 2020
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From: Portland, OR
Ended up purchasing pre cat o2 sensors for each bank. Finally got them and just changed them the other day. Took the car on a long test drive and check engine didn't come back. Went to take the car out today and before I got to the end of the street check engine came back. Got the same codes as before p2198 and p2196. I made sure when installing the o2 sensors not to get them twisted so I don't think that is the issue. My only other thought is maybe a leak from the exhaust manifold? Anyone have any other ideas as to what could be checked or tested?
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From: Portland, OR
Went out and read the sensor values again. Not able to take the car on a test drive so was only able to read values at idle and low revs. Value for bank 1 sensor 1 and bank 2 sensor 1 current at cold start were between 0.55-0.75. When the idle came down the values were between negative 0.06-0.11. At 2k rpm the values were between 1-1.7. For the equivalence ratio the values at idle were between 0.972-0.986 and at 2k rpm they were 1-1.2. It seems that both sensors are functioning correct, only thing I am unsure of is at idle the current values went a bit negative not sure if that is normal. I also tested for exhaust leaks, found a small one at the clamp between the muffler and cat ordered new ones for each side to replace but not sure if that is going to be the solution to this check engine since those clamps are after the cats so I would think there would be a code for post cat o2's not just pre cat on both banks.
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I can’t remember the exact codes but I remember I had one on my 2012 as well with the 02 sensors. Turns out some part of the electrical wiring below got corroded somewhere and split. At least that’s what the mechanic said. There was a few videos on Speed Test YouTube I would check it out
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From: Portland, OR
I ended up checking for exhaust leaks and found some. Took the entire exhaust off, changed gaskets and clamps which seems to have taken away any leaks. Took the car out again after clearing the codes and of course the same two codes came back. I found something talking about the intake solenoids can cause these codes so I took out the one connected to the airbox and the one on the drivers side intake manifold out, checked resistance and both had resistance of 0.27. So aside from vacuum testing as I cannot find my vacuum pump it seems those are both good. I think at this point I may be throwing in the towel and taking it to the dealer or indy to get this figured out as I have no idea what else to check or look for lol hopefully it doesn't get expensive
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I made a makeshift smoke machine trying to see if there was a vacuum leak somewhere. After all the drilling and mineral oil later (good thing mineral oil is at least cheap) I didn't find any leaks. In my effort to continue to solve this problem without having to take it to a mechanic (seems to continue to not be working lol) I was reading around some forum and saw someone talking about having check engine (didn't say what codes they had) but they thought it was bad o2 sensors and ended up being the AOS went bad. The symptoms sounded similar to mine. There was a comment that said to test if the AOS was bad to remove the oil cap and if the engine stalls then the AOS is bad, if it is good the rpm's should increase. I just tried this and when I removed the oil cap the car started to stumble but didn't die. Not sure if this is what could be considered close enough to stalling and be the sign the AOS is bad. If anyone has experienced an AOS going out would be happy to hear your experience and symptoms. I think after the smoke test and this AOS test I did today I am out of options and need to just call and make an appointment with the mechanic. That is unless I continue to search and find something else to test
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From: Clemson, SC
I made a makeshift smoke machine trying to see if there was a vacuum leak somewhere. After all the drilling and mineral oil later (good thing mineral oil is at least cheap) I didn't find any leaks. In my effort to continue to solve this problem without having to take it to a mechanic (seems to continue to not be working lol) I was reading around some forum and saw someone talking about having check engine (didn't say what codes they had) but they thought it was bad o2 sensors and ended up being the AOS went bad. The symptoms sounded similar to mine. There was a comment that said to test if the AOS was bad to remove the oil cap and if the engine stalls then the AOS is bad, if it is good the rpm's should increase. I just tried this and when I removed the oil cap the car started to stumble but didn't die. Not sure if this is what could be considered close enough to stalling and be the sign the AOS is bad. If anyone has experienced an AOS going out would be happy to hear your experience and symptoms. I think after the smoke test and this AOS test I did today I am out of options and need to just call and make an appointment with the mechanic. That is unless I continue to search and find something else to test
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I too have the full Fabspeed set up, an also had those codes awhile back. They were prompted by the aftermarket 200 cell cats. It could be the cats are bad, in which case, Fabspeed will warrant them one time for rebuild. That wasn't the case with mine, as my file showed warranty work done previously on the hi-flow cats. The other thing my indy told me was that by adding a spacer/washers to the O2 sensor, it keeps the sensor from going too far into the fitting in the exhaust. He did that with mine, cleared the codes and it has been a couple of years now with no returned codes.
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From: Portland, OR
Ah ok I see, I guess I can rule out the AOS is bad then. It was not difficult to remove the cap for sure
Thread Starter
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Joined: Oct 2020
Posts: 71
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From: Portland, OR
I too have the full Fabspeed set up, an also had those codes awhile back. They were prompted by the aftermarket 200 cell cats. It could be the cats are bad, in which case, Fabspeed will warrant them one time for rebuild. That wasn't the case with mine, as my file showed warranty work done previously on the hi-flow cats. The other thing my indy told me was that by adding a spacer/washers to the O2 sensor, it keeps the sensor from going too far into the fitting in the exhaust. He did that with mine, cleared the codes and it has been a couple of years now with no returned codes.
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The warranty work happened with the prior owner, who was the one who also installed the cats. However, I think these warranties are transferrable - call Fabspeed and ask. You get one rebuild per cat, and may be life of the cat, not owner specific. I can't remember. Anyway, my indy added spacers to the sensors, and problem disappeared.
