[geebra]

I need some help here guys, currently I have replaced the secondary O2 sensor 3 times, my spark plugs and my fuel injectors. And the code P2271 keeps coming back(running rich), I am out of ideas of where to look.

Any advice?

Thanks

 

[din9lebeRrY]

Replace the primary one. It's reading wrong but not out of spec to trigger a code.

I speak this because I had a pesky p0139 secondary o2 slow response and it didn't fix with an oem/Bosch/or rock auto sensor.

Replaced the primary. Code gone. Lol

 

[geebra]

Ya I am tempted to replace that but should it throw a code?

Sent from AutoGuide.com Free App

 

[CalgaryTSX]

DTC P2271 is an error from the rear O2 sensor, I'm not sure why replacing the front O2 sensor would help.

Do you still have the stock catalytic convertor in place?
If yes, perhaps your convertor is done. If not, are you using O2 sensor extender or defouler for the rear O2 sensor?


Since you have a 2007 TSX, FlashPro will fix your rear O2 sensor nicely!

 

[geebra]

Yup still a stock cat, how can I test if the cat is done?

Sent from AutoGuide.com Free App

 

[CalgaryTSX]

There is no precise way to test a catalytic convertor.
Since you have changed the secondary O2 sensor 3 times I would imagine that if you took your car to the dealer they would recommend to replace the cat.

Tests for the cat converter include a back pressure test, measuring the back pressure pre-cat with a pressure gauge.
Perhaps a wideband O2 sensor in the tailpipe could be used to test a cat also.

Perhaps you should try installing an O2 sensor extender or defouler. They are cheap & easy to install.

 

[geebra]

Not to sure, the Acura mech said if it was the catalytic converter then there will be a code also.........so he recommended replacing the ECU........

 

[geebra]

So it looks like I found the problem. While I was install my his fogs and hella Supertones, I took off my front bumper to do so. I noticed the extremely dirty ground point.

I basically cleaned it up with some rubbing alcohol. And I am not getting the code anymore.....so far so good.

Been trying to research what is connected to those grounds which is behind the air box on the driver side.

I'll attach some Supertones pics as well. looks more prominent in person.



Sent from AutoGuide.com Free App

 

[Rideorange]

That same ground point got dirty on my car like that as well, just not as extreme!

 

[geebra]

^^ I have no idea how it got that dirty

 

[din9lebeRrY]

That looks like excess dielectric grease was applied to that ground point during the assembly of the car, and overtime the dust/dirt/grime stuck onto it.

And to the posted who asked how the primary o2 causes the secondary to throw a cel? I am telling you what the new owner of my car did to fix his slow circuit response. I sold it to him with the code appearing intermittently. I sold it to him with a replacement secondary o2. He installed that, it came back. He put in a bosch, then an oem one, still had the code. It was P0139.

On long highway drives it would go away. Car was otherwise stock minus an intake and catback.

He took a shot, replaced the primary and it never came back.

 

[geebra]

^^ I assumed it was dielectric grease, but there was none on the other grounding locations.......I ordered a primary O2 last week and most likely return it now

knock on wood that its fixed

In any case, I had the fuel injectors replaced, replaced secondary O2 3 times, replaced spark plugs, had a valve adjustment. Took it to a Acura mechanic, couldn't find anything wrong.

Next on the list was cat, primary O2, and ecu........................hopefully not.

 

[geebra]

Turns out what I did above did not fix it. But what did fix the issue was replacing the primary O2 sensor. Even though the code suggested otherwise, it has been 3 months since and no code.

 

[din9lebeRrY]

DTC P2271 is an error from the rear O2 sensor, I'm not sure why replacing the front O2 sensor would help.

Do you still have the stock catalytic convertor in place?
If yes, perhaps your convertor is done. If not, are you using O2 sensor extender or defouler for the rear O2 sensor?


Since you have a 2007 TSX, FlashPro will fix your rear O2 sensor nicely!

Turns out what I did above did not fix it. But what did fix the issue was replacing the primary O2 sensor. Even though the code suggested otherwise, it has been 3 months since and no code.

:grinfawk: