Fault Codes P0171 and P0174

[JTO24]

Hey guys,

I'm getting a CEL that's showing the following codes:

P0171 (right bank too lean)
P0174 (left bank too lean)

The CEL originally came on after getting gas so I figured the gas attendant (NJ) didn't close the cap properly. The light went away after driving some miles. Didn't have a code reader so CEL reason unknown.

I got gas again last night and later on in the night the light came back on. I checked the codes this morning and found the codes above.

My research shows that the codes seem related to the intake (Googled the codes). I have the BMS intake and the MAF sensors are not in the stock location. Do you think the cold winter weather coupled with the misplacement of the sensors could be the cause? I don't want to bring it in to the dealer if they are just going to tell me it's because I have an aftermarket intake.

Any input would be appreciated.

[SROC3]

I recently read here about an issue with someone who had the BMS intakes as well. Their car was sputtering on startup. It's likely MAF sensor related but I'd bring it to the dealer to have the codes checked. Nice color combo on the car btw

[JTO24]

Originally Posted by SROC3

I recently read here about an issue with someone who had the BMS intakes as well. Their car was sputtering on startup. It's likely MAF sensor related but I'd bring it to the dealer to have the codes checked. Nice color combo on the car btw

Yea, I read somewhere on here someone saying their car was giving them trouble so they had to re-install the old intake. I love the sound of the intake but not at the expense of running a CEL in the winter. I'll make an appt. with the dealer to see what they say.

Thanks! My original order was for SSII over SO but this was too good a deal to pass up. Love your car

[SeatownF80]

Any updates? I'd love to keep my intake on if I can avoid the weird cold starts too.

[JTO24]

Originally Posted by SeatownF80

Any updates? I'd love to keep my intake on if I can avoid the weird cold starts too.

Yes, later in the day I posted the OP, the light went off and has stayed off. I'll need to get gas again this week but I'm going to go to a different station to see if that makes a difference.

The car starts and idles fine, too.

I'll keep you guys updated.

[A Frankfurt]

Originally Posted by JTO24

Yea, I read somewhere on here someone saying their car was giving them trouble so they had to re-install the old intake. I love the sound of the intake but not at the expense of running a CEL in the winter. I'll make an appt. with the dealer to see what they say.

Thanks! My original order was for SSII over SO but this was too good a deal to pass up. Love your car

I would install your OEM intake if you make an appt. at the dealership.
They will use the fault codes operation data to assist with the fault conditions.
Example : engine operation temp, vehicle speed, gear selection etc.. of course the information varies based on the code etc. but you get the idea.
Wouldn't want them to think you have been playing with your car when going in for a warranty issue

[AJF80]

I'm having the same issue now. I have aftermarket Intakes and DP's.. been on car for few hundred miles and no CEL... Now all of a sudden, CEL.

[JTO24]

Originally Posted by AJF80

I'm having the same issue now. I have aftermarket Intakes and DP's.. been on car for few hundred miles and no CEL... Now all of a sudden, CEL.

It ended up being my map sensors not being seated 100% in the flanges. The o-ring wasn't fully inserted so when the weather got cold enough, the rubber shrunk enough to let un-metered air into the intake. Once I re-seated the sensors, I never had a problem again.

[AJF80]

Originally Posted by JTO24

It ended up being my map sensors not being seated 100% in the flanges. The o-ring wasn't fully inserted so when the weather got cold enough, the rubber shrunk enough to let un-metered air into the intake. Once I re-seated the sensors, I never had a problem again.

Thanks man! I'll give this a shot over the weekend.. I'm in NJ so the car has been hibernating for a while as I wait for the warm weather.. Decided to take it out today, 30 Degrees, and the CEL pops up.. I'm hoping this has to be the reason you mentioned above.

[chetrickerman]

Anyone else had this issue? I installed BMS intakes a week ago and now I am getting a p0171 and p0174. I am running 91 pump from shell and JB4 on map 1.

I already checked the O-rings on the MAF sensors which are fine, fully seated and MAF sensors are oriented in the right direction (arrows pointing direction of airflow)

[Irishsig]

Just got the P0174 code this morning.
I did get gas on my way home yesterday and it was a bit colder than usual early this morning when I was leaving.

I'm hoping it's just the seating of the MAP sensors due to the colder weather.
I'll have to check em' after work today.

I have Maximum PSI intakes, but those were installed over a year ago with no issues.
As always great info on here guys, thanks

[chetrickerman]

Going BM3 with their stage 2 tune for intakes got rid of my codes

[Irishsig]

Originally Posted by chetrickerman

Going BM3 with their stage 2 tune for intakes got rid of my codes

Haha, don't give me any more reasons for more mods
I'm tryin' to cut back.

Good to know though.

[Kidsoles95]

Hey guys was this ever solved ?

[Devincey]

I had this issue when I installed front mount intakes. The CEL popped up a few days after installing them, was during a pull on the highway. Tried to readjust the intakes, play around here and there but the CEL won't go away. Ended up going back to stock intakes with BMC drop in filters, never saw the CEL again.

[nathanderf123@gmail.com]

Originally Posted by Devincey

I had this issue when I installed front mount intakes. The CEL popped up a few days after installing them, was during a pull on the highway. Tried to readjust the intakes, play around here and there but the CEL won't go away. Ended up going back to stock intakes with BMC drop in filters, never saw the CEL again.

Originally Posted by Devincey

I had this issue when I installed front mount intakes. The CEL popped up a few days after installing them, was during a pull on the highway. Tried to readjust the intakes, play around here and there but the CEL won't go away. Ended up going back to stock intakes with BMC drop in filters, never saw the CEL again.

What brand front mount did you have, I also have a lean code with the front mount I have

[Devincey]

Originally Posted by nathanderf123@gmail.com

What brand front mount did you have, I also have a lean code with the front mount I have

It was an international brand, they don't sell them here in the US.

I would suggest you re-install the intakes carefully and see if that does the job. If not, I highly recommend you go with the stock airboxes + BMC drop-in filters.

Our cars are sensitive to aftermarket intakes