According to the readout from the code puller its listed as HISTORY and CURRENT from the ECU. So I'm gonna assume I need a transmission fluid+filter change?

I also have the Bank 1 + 2 Lean codes come up too. Since Its both banks and they are lean I'm going to assume its a vacuum leak downstream of the MAF or an O2 sensors issue. I cleaned the MAF, but who knows if that worked.

_________________
Forever Pontiac

1926 to 2010.
Gone.... but not forgotten.

Yes on the later, I will have to look up 897. It can be a history code and current code at the same time. Is it commanding your CEL on? If so, I'm not sure why.

_________________


Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

I don't know if its commanding the CEL. It comes on and goes off every few days. I assumed the CEL was being commanded by the lean codes, because that seems like an issue that wouldn't remain as constant depending on atmospheric and driving conditions. Thats just my reasoning behind the SES/CE light coming and going.

_________________
Forever Pontiac

1926 to 2010.
Gone.... but not forgotten.

Yes. That is driven by the lean codes (P0171 or P0174).

If it's intermittent with the change in weather, I'd lean towards dirty HO2S's. A leak post MAF is a leak regardless of temps outside (generally).

_________________


Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

So whats the procedure? Should I replace the HO2s? How many and where are they located on this car?

_________________
Forever Pontiac

1926 to 2010.
Gone.... but not forgotten.

Clean them first. Some electronics cleaner will work. Douse them good (the fluted/holed part that is in the exhaust stream), let them dry, put them back in.

How long that'll work before they flag again is anyones guess. I've had them never have issues again. I've had others like my Suburban that gave me a fit a month later. At which point, I then replaced them.

_________________


Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

Intake and throttle body gaskets that are leaking will also cause the lean
codes on both banks. There is also a PCV tube that runs under
(yes under) the intake manifold that breaks down from heat
and leaks.

_________________
Black 95 SSEi (original owner) 238K miles
Black 05 GXP (some idiot put the first 12K on it)186K miles
Black 04 Tahoe (original owner)310K miles
Black 16 Traverse (original owner)90K miles
Black 15 Lacrosse (some nice lady put first 15K on it)43K miles


"You can have one in any color as long as it's black" - H. Ford

That usually a constant issue though (any leak post MAF). HO2S's can be intermittent, which is what I believe he is having.

_________________


Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

Yep, SES light went off again today. Give it another day and It'll probably come back on lol.

_________________
Forever Pontiac

1926 to 2010.
Gone.... but not forgotten.