Error code, what could be the cause?

Zatrekaz · December 10th, 2011, 03:22 PM

Had this error code pop up today:

P0171

I went by Autzone and got them to pull it, and this is what I got:

Definition: Fuel trim bank one condition
Explanation: The powertrain control module uses the oxygen sensor to calculate the Air/Fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.
Problem cause:
1. - If bank one and two codes set together suspect fuel pressure or MAF sensor.
2. - Oxygen sensor Defective
3. - Ignition misfire - repair
4. - Fuel injector problem

The car is still running, but I can tell the RPMs are running higher than normal with idle. The exhaust as a drone to it that was not there before.

What do you think it could be? I am guessing an O2 sensor has gone bad.

Stang6899 · December 10th, 2011, 03:39 PM

Any loss of power or acceleration when driving?

Zatrekaz · December 10th, 2011, 03:44 PM

None that I can notice.

The car is due for an oil change. I think I will do that and fill up the gas tank and see how that affects it. Some people seem to have had water in the fuel and that caused it. The car was sitting in a 1/4 full tank for about 3 weeks. Some moisture could have formed in the tank.

I think I will follow this path:

Change oil and fill up gas
Clean/Replace CAI filter
Clean MAF Sensor
Replace Bank 1 (passenger) O2 Sensors
If all of that fails, I will begin looking at the fuel injectors on bank 1 (passenger)

mustangmike! · December 10th, 2011, 03:56 PM

Go to somewhere else for a code reading lol

6ER THEN I 8ER! · December 10th, 2011, 04:26 PM

Originally Posted by mustangmike!

Go to somewhere else for a code reading lol

the code doesn't magically change from parts store to parts store lol...

@zat...my GT got that code after i installed a new midpipe...it was due to a leak i had on the passenger side where the gasket is on the manifold/exhaust pipe...it made my upstream o2 read weird and that made the car idle strange...just something to look at.

Zatrekaz · December 11th, 2011, 12:35 AM

You know, I have had a leak on my passenger side header/manifold for awhile...

Everytime you start the car up it makes a ticking sound on that side until it warms up. I will change out that gasket first and go from there.

6ER THEN I 8ER! · December 11th, 2011, 12:55 AM

Originally Posted by Zatrekaz

You know, I have had a leak on my passenger side header/manifold for awhile...

Everytime you start the car up it makes a ticking sound on that side until it warms up. I will change out that gasket first and go from there.

sounds good...and yea that's the same noise i had

December 10th, 2011, 03:39 PM	#2
Stang6899 Hardcore Enthusiast Modded V6 Join Date: Sep 2006 Location: Mukilteo WA Posts: 1,466 iTrader: 1 reviews	Any loss of power or acceleration when driving? __________________ 1999 e46 328i BMW - Daily Driver 2001 SVT Cobra - Project 1995 v6 vert - SOLD 1996 v6 vert - SOLD 1995 v6 vert #2 - SOLD 1995 GT - SOLD 1997 v6 coupe - Parting

December 10th, 2011, 03:44 PM	#3
Zatrekaz Wax on, Wax off 2003 Mustang V6 16.8@83.3 Join Date: Aug 2007 Location: Mississippi Posts: 6,954 iTrader: 15 reviews	None that I can notice. The car is due for an oil change. I think I will do that and fill up the gas tank and see how that affects it. Some people seem to have had water in the fuel and that caused it. The car was sitting in a 1/4 full tank for about 3 weeks. Some moisture could have formed in the tank. I think I will follow this path: Change oil and fill up gas Clean/Replace CAI filter Clean MAF Sensor Replace Bank 1 (passenger) O2 Sensors If all of that fails, I will begin looking at the fuel injectors on bank 1 (passenger) __________________ Black Bullitt Rims FT/FS Looking to Sell or Trade for Silver FR500s Looking to buy a lot of 99-04 Interior Pieces If you have any for sale, PM me

December 10th, 2011, 03:56 PM	#4
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	Go to somewhere else for a code reading lol __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

December 11th, 2011, 12:35 AM	#6
Zatrekaz Wax on, Wax off 2003 Mustang V6 16.8@83.3 Join Date: Aug 2007 Location: Mississippi Posts: 6,954 iTrader: 15 reviews	You know, I have had a leak on my passenger side header/manifold for awhile... Everytime you start the car up it makes a ticking sound on that side until it warms up. I will change out that gasket first and go from there. __________________ Black Bullitt Rims FT/FS Looking to Sell or Trade for Silver FR500s Looking to buy a lot of 99-04 Interior Pieces If you have any for sale, PM me

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