I have an 06 Evo 9 MR.
I recently had a Buschar TBE with HFC and Magnaflow Muffler installer as well as a Buschar Evo Filter, Upgraded Fuel Pump, Forge MBC and a Flash. All in all the car is now a monster, what a difference, I can't believe I ever drove this thing stock.
After having the above on for about 2 days all of a sudden my SES light came on so off to Autozone I went and had the code pulled. The code reads P2195 - Oxygen sensor or A/F sensor stuck lean-Bank 1 sensor 1 - I am assuming this is somewhat minor so I had the code re-set so I don't have to see that annoying light however I am sure it'll be comming back if I don't get it fixed so onto my question, what exactly is the problem, how can I fix it and is it anything to worry about ? ? ?

Thanks in advance,
MarK.

 

Well one of your 02 sensors are bad. Im thinking the front one. But not positive. Maybe it got damaged during the installs. If it doesn't come back on dont worry about it.

If it is the front one, its important unlike the rear one. The rear one only makes sure the cat is working and the front one actually is a narrow band so its there to keep your air fuels in check.

--Josh

 

Much appreciated. With the error code message stating "Bank 1 sensor 1" is this refering to one of the O2 sensors specifically or do I have to work out which one it is myself ?
Any further help on this would be much appreciated as these little things really **** me off. When I went to bed last night all I could see when my eyes were shut was the ****ing SEL light and although it has now been re set, I am guessing if I don't resolve the problem that light will be back on.

Thanks again,
MarK.

 

I'm pretty sure bank 1 sensor 1 is the front one. The rear one gives a different code. Its always for the cat inefficient or something along those lines. If it comes back on I would change the front o2. You can find them for around 80 bucks i think. Just dont buy them from the dealer.

--Josh

 

Ok so if it does come back on it looks like it's faulty sensor ? When you refer to the front and back one does front mean before cat and rear is after cat ? Also I started looking and there are 1,2,3 and 4 wire oxygen sensors available, which would be the correct one for my 06 Evo 9 MR ?

Thanks again,
MarK.

 

Yea exactly. Front one is in your o2 housing on the turbo. You will need the the 4 wire i think. Just look down by your turbo and you can see the sensor. Just look and see how many wires are coming out of it. I think it has 2 blacks a blue and a white wire.

--Josh

 

Thanks Josh, much appreciated. I'll have a look and see. In a best case the light wont come up again but in the event it does, which it probably will I'll get a new sensor if this is really the problem. Also if there is anyone who can confirm for sure what the particular reading means in terms of which sensor, front or back I would appreciate it.

MarK.

 

Ok the light just came back on as aspected so there is def. an error somewhere. Can you confirm exactly what I will need to do to fix the issue as I don't quite understand. Thanks to anyone for any insight.

MarK.

 

i had the same problem it is the 02 in the turbo outlet the sensor is not bad you are running to lean at idle richen it up do you have a a/f wide band gauge

 

See I am getting a lot of mixed opinions, some are saying it's a faulty front 02 sensor, some are saying I need an extender for the rear and now you are suggesting I am running to lean. I genuinly don't have a clue I just wish everyone was saying the same thing so I could go to a local mechanic and get exactly was was needed to be done done if you know what I mean. In response to your Qu I do not have an a/f wide band gauge but I did get a custom tune and am positive they adjusted the a/f properly so it was running just right ? ? ?

Thanks for all the input so far guys and keep it coming, I really want to know what the cause is and get it fixed as it's pissing me off - LOL

MarK.

 

i just went through the same thing and i guarantee that your running to lean. I took everyones advice that it was a bad sensor and had it replaced. The same code came up again. My car was running good it just needed to be richened up at idle.

 

So in your opinion if my tuner just richens up the A/F at idle and resets the code it will not come up again ? ? ?

 

And correct me if I am wrong but from what I am reading an O2 sensor measures the A/F ration in the exhaust and if it's running too rich or too lean it sends a signal back to the ECU to adjust it properly so should the O2 sensor and ECU not compensate for this in the event it's running one way or the other ? I am a little confused.

MarK.

 

i would put money on it and do your self a favor get a a/f gauge to monitor it could save your motor

 

i dont know where you read that but it doesn't work that way