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PostPosted: Tue Oct 27, 2015 4:34 pm 
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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.

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PostPosted: Tue Oct 27, 2015 4:50 pm 
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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.

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PostPosted: Tue Oct 27, 2015 5:01 pm 
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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.

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PostPosted: Tue Oct 27, 2015 5:31 pm 
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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).

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2009 Chevrolet Impala SS: LS4 V8, Victory Red
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PostPosted: Thu Oct 29, 2015 5:26 pm 
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So whats the procedure? Should I replace the HO2s? How many and where are they located on this car?

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PostPosted: Thu Oct 29, 2015 5:54 pm 
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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.

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2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
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2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
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PostPosted: Fri Oct 30, 2015 9:29 am 
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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.

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PostPosted: Fri Oct 30, 2015 5:54 pm 
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That usually a constant issue though (any leak post MAF). HO2S's can be intermittent, which is what I believe he is having.

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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:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
2003 Chevrolet Suburban 2500: Doeskin Tan - new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Fri Oct 30, 2015 9:36 pm 
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CMNTMXR57 wrote:
HO2S's can be intermittent, which is what I believe he is having.


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

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