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Old 04-14-2015, 07:10 AM   #1
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Q about O2 sensors

I have a 2006 V10 6.8L 30V, I had a P2195/P2197 code, I read somewhere it may be caused by the full banks power I have.

I checked the O2 sensors with an app, it loks like this while idling:


Note that it idles fine at a stable RPM and I do not hear anything special.

Is it normal that the O2 sensors swing like this?

Thanks!
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Old 04-14-2015, 09:03 AM   #2
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How long have you had the Banks installed?

Is the bottom line the time in seconds?


The O2 sensor is there to tell the engine if a lean or rich condition exists and has it add fuel or defuel respectively. I would expect that the curve would flatten out eventually.
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Old 04-14-2015, 09:21 AM   #3
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Quote:
Originally Posted by Magister54 View Post
I have a 2006 V10 6.8L 30V, I had a P2195/P2197 code, I read somewhere it may be caused by the full banks power I have.

I checked the O2 sensors with an app, it loks like this while idling:
Note that it idles fine at a stable RPM and I do not hear anything special.

Is it normal that the O2 sensors swing like this?

Thanks!
This is the normal output of a Narrow Band O2 sensor. when operated in Closed Loop fuel control.

Narrow Band are the traditional ones and are cheaper than Wide Band.

Wide Band can tell you how much richer or leaner than the ideal fuel mix you are.

Narrow Band can only tell you you're rich or you're lean, and not by how much.

So the mixture is intentionally made progressively richer until the Narrow Band O2 says RICH, and then ramped progressively leaner until the sensor says LEAN and so on.
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Old 04-14-2015, 09:50 AM   #4
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They have been installed in 2008 or something like this, I bought the MH last year, I did have a P2195/P2197 last year, one time, I cleared them and made 5000 miles without them appearing again.

Yes the bottom line is in second.

When I pressed the throttle to go at around 2000RPM, it flattens out yes!
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Old 04-14-2015, 10:08 AM   #5
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Normal dithering response of the sensors, as was stated above.

Remember, these codes are not O2 codes. The O2 sensors are working, they are stuck lean at some point when it's commanded to be rich. Could be an air leak. Being that it's both banks, I'd be looking around the throttle. A leak in an exhaust manifold or an intake gasket would show up in one bank, not both. Change the air filter or anything on top of the engine that may have disturbed a vacuum line?

You can probably see the leanness in the long term fuel trims too.
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Old 04-14-2015, 02:02 PM   #6
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^^ x2 you have a lean condition, check for vacuum leaks. It still could be a leak in the intake gaskets if it has failed on both sides, unlikely but still possible.
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Old 04-14-2015, 03:20 PM   #7
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Quote:
Originally Posted by mpaton View Post
This is the normal output of a Narrow Band O2 sensor. when operated in Closed Loop fuel control.

Narrow Band are the traditional ones and are cheaper than Wide Band.

Wide Band can tell you how much richer or leaner than the ideal fuel mix you are.

Narrow Band can only tell you you're rich or you're lean, and not by how much.

So the mixture is intentionally made progressively richer until the Narrow Band O2 says RICH, and then ramped progressively leaner until the sensor says LEAN and so on.
This is SPOT ON!

I've been tuning for years. I think this guy has too.
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Old 04-23-2015, 01:11 PM   #8
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While in a garage for oil/lub, a mechanic checked from header to exhaust and found no leaks... As it happens once a year, meh? Also yes I cleaned/oiled my K&N filter, maybe I wiggled something during the process but I started the engine maybe 20 times since I cleared the code and they didn't reappear. I will monitor with my OBD2 tool.
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Old 04-23-2015, 09:24 PM   #9
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Could you post a picture of your long term fuel trims?
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Old 04-24-2015, 06:18 AM   #10
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Originally Posted by mrt_1111 View Post
Could you post a picture of your long term fuel trims?
Ok, will do (may be later!)
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