multiple code fix
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From: California
Popping CODES HELP!
my truck is killing me in gas mileage (8mpg city- 10mpg highway) due to high expenses I cannot afford the maintenance.
My 2003 Ford F-150 5.4L is giving me 3 codes and I dont know what they mean.
P0135- o2 sensor heater circuit (Bank 1, Sensor 1) ---which side and which sensor?
P1131- (exact words on the reader) Manufacurer control Fuel Air Metering?
P0171- System Too Lean (Bank 1)--- The result from the other 2 codes?
If someone could tell me what these parts are and where they go, I can do this. I'm used to imports and my other ford has never given me any trouble.
My 2003 Ford F-150 5.4L is giving me 3 codes and I dont know what they mean.
P0135- o2 sensor heater circuit (Bank 1, Sensor 1) ---which side and which sensor?
P1131- (exact words on the reader) Manufacurer control Fuel Air Metering?
P0171- System Too Lean (Bank 1)--- The result from the other 2 codes?
If someone could tell me what these parts are and where they go, I can do this. I'm used to imports and my other ford has never given me any trouble.
Last edited by Torque1st; Sep 27, 2006 at 06:51 PM. Reason: Remove "--WTF"
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Hello- Welcome to FTE! I have moved your post to the specialized forum we have here for your question. Check out the list of tech forums we have on FTE. There is a wealth of information and expertise here to help you. There are a number of links in my sig below to help you also. Have fun! 
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Hey koby 777.
Is your truck by chance a lp gas truck? Bank one is the passanger side of the truck. Bank 2 is the drivers side. Sensors number one for both sides are up close to motor, sensors number 2 are down by the converters, on both sides.
Is your truck by chance a lp gas truck? Bank one is the passanger side of the truck. Bank 2 is the drivers side. Sensors number one for both sides are up close to motor, sensors number 2 are down by the converters, on both sides.
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multiple code fix
I have multiple codes that some users say point to one part to replace. First question is;
Q1: On the ODBII; does it mean MAF sensor when it says, "Manufacturer Fuel Air Metering" or is this a completely different part? ref: code p1131
Q2: Will changing the O2 sensor (bank 1 sensor 1) code p0135 fix the previous code?
Q3: Will all that fix my P0171 (Sys too Lean Bank 1)?
I would like to get this resolved in the cheapest fashion.
Thank You,
Jacoby Hunt
US NAVY
Q1: On the ODBII; does it mean MAF sensor when it says, "Manufacturer Fuel Air Metering" or is this a completely different part? ref: code p1131
Q2: Will changing the O2 sensor (bank 1 sensor 1) code p0135 fix the previous code?
Q3: Will all that fix my P0171 (Sys too Lean Bank 1)?
I would like to get this resolved in the cheapest fashion.
Thank You,
Jacoby Hunt
US NAVY
Hotshot
Joined: Jan 2004
Posts: 19,760
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From: St Louis
You have either a weak/lazy upstream O2 sensor on the passenger side or a vacuum leak affecting only that side.
The [bold]CORRECT[/bold] procedure would be to reset the codes and, using a very-capable scan tool, run the KOER portions of the PCM Quick Test and to observe the fuel trim PIDs. A scan tool that provides a graphical display of the O2 Sensor outputs would also be useful.
Lacking all that, you could try swapping the upstream sensors to see if the code switches to the opposite bank or not.
A replacement sensor would likely run around $60 at any decent auto parts store.
Steve
The [bold]CORRECT[/bold] procedure would be to reset the codes and, using a very-capable scan tool, run the KOER portions of the PCM Quick Test and to observe the fuel trim PIDs. A scan tool that provides a graphical display of the O2 Sensor outputs would also be useful.
Lacking all that, you could try swapping the upstream sensors to see if the code switches to the opposite bank or not.
A replacement sensor would likely run around $60 at any decent auto parts store.
Steve
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From: Louisville, Kentucky
Koby welcome to FTE! 
P1131 - Lack of switching, sensor indicates lean, Bank 1.
P1131 - Lack of switching, sensor indicates lean, Bank 1.
- Check for a disconnected O2 sensor or damaged wiring.
- Again, O2 sensor is not sending signal, check for a disconnected O2 sensor, Bank 1 Sensor 1. The first O2 sensor, before the Cat.
- This code goes along with the others. This code can at times, indicate a dirty MAF but, in that case usually there are codes related to both banks. It's best to take the MAF sensor off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling.
Last edited by KingRanchMan02; Sep 28, 2006 at 10:18 AM.
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re: multiple codes
ok, i found where the upstream O2 sensor is, i see the plug in. but i am completely uncapable of getting my hand up there to pull it. should i remove it from the exhaust pipe, then attempt to unplug. or maybe seperate the down pipe from the manifold and then remove. i am only cautious because i dont want to remove this part and not be able to get it back in there.
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From: Louisville, Kentucky
All I can suggest is to do what you need to do to check it out. All of your DTCs are suggesting that the O2 sensor is not getting a signal to the computer. Whether this is a wiring problem or a failed sensor is what you need to determine.
If you can, it might be helpful to use a voltmeter to check voltage levels on the bank 2 sensor in comparison to the bank 1 sensor. If voltages are similar on both sides, then the sensor would need to be replaced. I do not have information on what voltage levels should be. Maybe project can help with this information for you.
If you can, it might be helpful to use a voltmeter to check voltage levels on the bank 2 sensor in comparison to the bank 1 sensor. If voltages are similar on both sides, then the sensor would need to be replaced. I do not have information on what voltage levels should be. Maybe project can help with this information for you.
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Joined: Jan 2004
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From: St Louis
A voltmeter check of the O2 sensor output is usually not a useful diagnostic. The sensor output is constantly changing/switching and this is not well represented by either an analog or digital meter. A visual display such as an memory oscilloscope or a graphing scan tool (or the computerized equivilent) is the best way to see what the signal is actually doing.
Steve
Steve
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From: Louisville, Kentucky
Thanks for the information Steve.
My line of thought is that if the signals are similar for both O2 sensors, then the conclusion would be a failed sensor. On the other hand, if the signals are nonexistent on the bank 1 side compared to bank 2, then look for broken wiring.
My line of thought is that if the signals are similar for both O2 sensors, then the conclusion would be a failed sensor. On the other hand, if the signals are nonexistent on the bank 1 side compared to bank 2, then look for broken wiring.
thanks to the users!
Hotshot
Joined: Jan 2004
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From: St Louis
Originally Posted by koby_777
thanks to the friendly users I was able to fix the exact problem. you guys rock and keep doing what you're doing.
Steve
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response to the codes
the codes were all cured by one fix. the upstream o2 sensor in bank 1. it was a huge pain in the *** but it was worth the trouble, my gas mileage instantly went up to 17mpg on the highway instead of 10.