Code P1171

[snowtrooper1966]

Thanks, gentelmen!
No symtoms at all.
I changed the fuel filter last summer, as well as trated the fuel system with seafoam.
I am also getting codes:
P0137 02 sensor circuit low voltage (bank 1 Sensor 2)
&
P0157 02 sensor circuit low voltage (bank 2 sensor 2)
I am guessing I need to replace the post cat 02 sensors?

I have cleared the codes, and they come back pretty quick.
I will clean the MAF and see what happens with the P1171 code.
Best,

[Jolly Roger VX'er]

Thanks, gentelmen!
No symtoms at all.
I changed the fuel filter last summer, as well as trated the fuel system with seafoam.
I am also getting codes:
P0137 02 sensor circuit low voltage (bank 1 Sensor 2)
&
P0157 02 sensor circuit low voltage (bank 2 sensor 2)
I am guessing I need to replace the post cat 02 sensors?

I have cleared the codes, and they come back pretty quick.
I will clean the MAF and see what happens with the P1171 code.
Best,

I got one of these oxygen sensor codes too when I had the previously mentioned problem. Autozone wanted to sell me an oxygen sensor but I tried cleaning the MAF first. When that didn't help I opted to replace it (nobody tests them.) That wound up clearing up "both" of my trouble codes of "Lean under acceleration" and "P0157".

[snowtrooper1966]

Oh, and many thanks to Tone for the PDF! Invaluable info for all!

Jolly Roger VX'er, so based on your experience, changing the 02 sensor cleared both codes?

Am I correct in thinking the 2nd sensor in both banks is the post cat?

Best,

[Jolly Roger VX'er]

Oh, and many thanks to Tone for the PDF! Invaluable info for all!

Jolly Roger VX'er, so based on your experience, changing the 02 sensor cleared both codes?

Am I correct in thinking the 2nd sensor in both banks is the post cat?

Best,

no...i never had to fool with the oxygen sensors. I just had to try cleaning the MAF...then when it didn't help...I replaced the MAF.

My MAF turned out to be bad so cleaning didn't help. But, at $150 for a MAF..why not try cleaning it first using some CRC MAF spray for like $4.

It was explained to me that sometimes a "real" problem will spawn some other codes that really are not the problem.

In this case..the "real" problem was the MAF sensor....which spawned a "false" code of P0157 too.

[snowtrooper1966]

Got it!
You replaced the MAF after cleaning did not clear the codes.
That throws a curve in my plans. 150 for a MAF (if cleaning does not do it) or 50 to 100 for 2 oxygen sensors....
What milage where you at when this happened?

[Jolly Roger VX'er]

Got it!
You replaced the MAF after cleaning did not clear the codes.
That throws a curve in my plans. 150 for a MAF (if cleaning does not do it) or 50 to 100 for 2 oxygen sensors....
What milage where you at when this happened?

I'd say to the best of my memory it was around 40,000 miles. I remember getting my Supercharger on at 36,000 miles and it was about a few months later that I started having this problem.

[snowtrooper1966]

Nice!
I Will clean the MAF tomorrow and see what happens...