gth181a

A PO171 code just popped up on my 08 TL-S. It said something about emissions. Does anyone know what exactly it is?

Will I be okay until next Saturday (2/21), when I could drop it off at the dealer?

Thanks!

acuraservice

p0171 is indicating a bank #1 Lean condition, meaning that the oxygen sensor has detected the exhaust on the #1 bank of cylinders has an abnormally high oxygen concentration. 1st question would be what fuel are you running? Could also be a faulty oxygen sensor, we have seen a handful of those but not very many.

gth181a

Thanks for your help acuraservice! Now that I think about it, I filled up with BP 93 octane gas before I drove about 45 miles for some shopping. I come back to start the car and this codes pops up.

Just made an appointment to have my car looked at on Tuesday at the dealer. Hopefully, I'll be fine till then.

RACINGHART03

iTrader: (2)

If its a Type S there is a TSB.

gth181a

Yeah, it's a Type S. BUT it went away this morning so I canceled the appt. Anyone know where the TSB is?

DasTeknoViking

Applies To: 2007–08 TL Type–S – ALL
MIL Comes On With DTC P0171 or P0174
SYMPTOM
The MIL is on with DTC P0171 (rear bank [bank 1] fuel
system too lean) or DTC P0174 (front bank [bank 2]
fuel system too lean).
PROBABLE CAUSE
The PCM misinterprets inputs as a lean condition.
CORRECTIVE ACTION
Update the PGM-FI software with the HDS.
SOFTWARE INFORMATION
HDS Software Version: 2.015.018 Sept 2008 (blue) or
later.
Control Module (CM) Update:
Application Version V6.13.09 or later.
Database Update 01-SEPT-2008 or later.
NOTE: If you use an earlier HDS software version, the
HDS may incorrectly indicate that the vehicle does not
need an update when it actually does.
The updated PGM-FI software program IDs and P/Ns
are shown below. If this, or a later program ID, is the
Current Program ID displayed during the update, the
software for this service bulletin is already installed.
ork.
REPAIR PROCEDURE
Update the PGM-FI software with the HDS. Refer to
Service Bulletin 01-026, Updating Control Units/
Modules.
Year/Model Program ID Program P/N
2007 with M/T DBA040 37805-RDB-A04 or later
2007 with A/T DBA550 37805-RDB-A55 or later
2008 with M/T DBA120 37805-RDB-A12 or later
2008 with A/T DBA620 37805-RDB-A62 or later

There ya go, just took this off the Acura Interactive Network

StYLeZz101

this happens to me but im an 04 5AT...it happen when im just idling or just drivin the car normal...it will come on and then come off...the codes that i throw is p0171 and p0174...since i have the procats can it be that the cats have deteriorated and is causing this to come on and off??

DasTeknoViking

No, you just need to inspect the intake plenum gasket between the lower intake and the upper. Gasket somehow forms corrosion and creates a leak in the intake manifold sealing area causing the MAP reading to go through the roof and cause LEAN codes.

I have replaced MANY A/F sensors for this problem also.... and I mean MANY ! So its either a gasket problem, or a bad 02 sensor. No ECU update for the TL unless its for these problems......

Applies To: 2004 TL – ALL
MIL Comes On With DTC P2195 or P2197
(Supersedes 04-016, dated May 21, 2004)
SYMPTOM
The MIL is on, and DTC P2195 (rear air fuel ratio
sensor signal stuck lean) or P2197 (front air fuel ratio
sensor signal stuck lean) is set.
PROBABLE CAUSE
The ECM/PCM software incorrectly interprets sensor
inputs, causing the codes to set.
CORRECTIVE ACTION
Using the HDS, update the ECM/PCM

OR....

the misfire update... which I have never done to any car..

StYLeZz101

So I need to inspect Gasket #2 or 7

thanks for the info

DasTeknoViking

usually its just #2.... but I have seen 7 go bad too.

Its a metal gasket and it tends to form corrosion from the touching aluminum plenum.

Majofo

Good to know.

RACINGHART03

iTrader: (2)

Before you pull it apart spray some carb cleaner on and around the gaskets to verify a leak. I havent heard this one yet. (corrosion causing a leak) so I am interested.

Majofo

Whatever you do.. don't use a graphite tube to listen for a leak.. lol.. I heard from my buddy that his friend did that and he touched a hot ground wire.. shocked the shit out of his ear.. lol..

StYLeZz101

i have the thermoblock spacer installed on the car...so assuming it is the plenum spacer...it means the spacer has failed..it was installed fall 05 i believe

http://www.outlawengineering.com/hondajframe.html

BxTrini_TL

Hey ive been getting the same code.. i just replaced my o2 sensor and it came back on with a fuel trim code i cleared the code... car seems to be running fine... only now its felling like im gettin a misfire.. im not really sure whats the next step i should take.. any advice? thanks

Majofo

Holy thread bump Batman

Majofo

Any other code?

BxTrini_TL

The CEL hasnt come back on.. but im still feeling the misfire.. but yes there was another code for fuel trim..

xmrgoodcatx

iTrader: (1)

What brand sensor did you buy? NGK, BOSCH..etc... Did you buy the one that was direct fit? or is universal where you have to splice it using the old connector?

I had this same problem for awhile. I would get a lean bank code for either side didn't matter. I was running oem style K&N filter since at the time no manufacture was carrying the 07-08 tl filter other then the dealer. I would reset the code and it would come back every 4-6 months then go away for another 4-6 months. I ended up removing the filter, going back to the stock filter and then cleaned the throttle body of any build up.

After cleaning the throttle body and MAP sensor, the CEL hasn't returned in over 40k. In your case I would start by checking the O2 sensor you replaced, the connections, check to see if all hoses and other connectors you removed are back where they should be. Make sure the sensor is not loose in bung. Clean the throttle body with throttle body cleaner. I could be wrong but I think a failing MAP sensor can cause a fuel trim CEL.

BxTrini_TL

thanks for the reply.. im not sure the brand of sensor it was but its a cali emmisions sensor and it was direct fit... my next step was to clean the throttle body etc.. i also have an aftermarket intake. my friend a tech at honda said i need to put back a stock air filter and see how it runs. now i gotta look for a stock one cuz i bought the car with the aftermarket one. Thanks again ill let u know how it goes..

F20

Hi Newbie here...please help me if possible!
Been searching a long time in the forums for an answer to why my '97 CL 3.0 is throwing the P0171 code.
It runs great but rough around 2000 RPM. Not always, but frequently it bogs around 2000 unless I punch it and get RPMs higher. Much better when warmed up, nearly undrivable cold unless operating temp has been reached. been going on for months and can't pass smog.
Here's what I have done:
Replaced air filter, cleaned throttle body & intake, plus ran Seafoam
Checked twice for vaccuum leaks and found none.
Gas cap is only 2 years old.
Car has 212K and runs perfect otherwise.
Car used to throw an Evap code but hasn't in months, code has gone away without being deleted, the persistant code now is P0171 "Too lean" bank 1.
Just can't afford to get burned at the local shop since I can fix most stuff, any advice anyone?
I can post freeze frame data if anyone needs it...
Many thanks.

Will Y.

IDK if your CL has 02 sensors like the 3G TL, which sometimes throws that code when there's a bad 02 sensor rather than a vacuum leak or fuel issue.

You might try a search in the 1st Gen CL forum at: https://acurazine.com/forums/1g-cl-1997-1999-56/.

Welcome to AZ, and G/L resolving the problem!

zubi23

how can you tell if your car "misfires"?

Will Y.

If you can't tell from a rough idle, misfires should result in a Check Engine Light and an error code read through the OBDII port.

F20

Thanks, Will--that actually is a help because I think that very well may be what is happening to me.
Had a Lexus doing something similar & made the mistake of taking it in to the shop and got stung for $400 total bill on a simple O2 sensor w/labor. On my CL I think I'm just going to bite the bullet & shell out the lousy $69 for the 02 sensor & throw it in myself, since I'm getting the reading of lean on upstream sensor, its never been changed so its worth a try rather than risking a hefty bill at the shop. Where I live almost all the shops charge diagnostic fees that are NOT credited back to labor costs. This one might be worth chancing. Also I read online somewhere that the overwhelming most common CEL code for any modern car is the O2 sensor, so that furthers the odds that that may be the culprit.

Now if I could just figure out how to view my own posts because it was really difficult to find my way back to this thread after a logoff...
thanks.

F20

Will Y, thanks very much because it was in fact the O2 sensor!

Right after replacing the upstream sensor (which is in an awkward spot), the car ran perfect, no more codes and passed emissions like a champ.
Also got my power and gas mileage back.
This solves a year-long problem of mine so I couldn't be happier.

To anyone else searching these forums, this was on a '97 CL which never once threw an O2 code, but rather was throwing lean codes and vacuum leak codes (Evap).
All checked out in the end with no vacuum leaks, just a simple O2 sensor and all is well. Recommend going the extra mile and getting a Denso (OEM) rather than Bosch that is so common at the local parts store.
Thanks.

Boogsephine

My check engine light came on last night and gave me the P0171 code. With this TSB do I just take it to the dealership and they'll update the software for free? Hopefully it's nothing else going on with it.

Boogsephine

Just called my local Acura dealership and they want $110 to reflash the computer. I thought it would be covered by them since it is a TSB for that issue.

Maybe I'll have to contact Acura corporate and let them know how I feel having an issue this soon being I just purchased the car a month ago.

Timstandupguy

Bullshit 110 to reflash thats pretty plugging out the pgm and computer thats it. I had my problems fixs after 3 trips to the dealer but one dealer was the problem solver. I got my pgm update and about 2 later computer trips P0171 , then a month around 57k i got my MAP sensor Change it was good for bout 3 months then boom it comes back. so i head to a Dealer in Queens by the Name of PARGON Acura mike my service rep knew what the problem was and it was basically it need the Valve Adjustment that i pretty been trying to avoid. but it work and now am at 81k and still doing good gas mileage when up. smooth idle

Boogsephine

I tightened the gas cap even though it was tight before, went into the navigation settings (map, cancel + setup?) using the 3 key press and cleared out the messages from the XM unit and it seems to be fine now. The light went off right when I started the car.

Maybe it had something to do with the weather changing so quickly (60's down to the teens) and having just filled up.

Lets just hope it stays off.

Timstandupguy

monitor it but you more then likely going to have to get a valve adjustment

Question my friend
1# did you have that tighten gas cap on ?
If so you going to have to get you Purge valve sensor change its a Defective part out of Mexico.

avtech1

Would, you happen to know the part # for this sensor? and its actual location?

alexinter

HELP.....what it means
All - Wheel Dr:77@409

Emission Sy: P0171@400

03max6spd

BUMP having this issue, took the car in for the update. CEL came back two days later, Acura has the car and is diagnosing it free of charge. Anyone else have and solved this issue?

Houston Jacobs

If there is a intake leak and I spray carb cleaner then what would happen to let me know there is a leak?