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P0171 code on a 2004 ford f150 - Cars & Trucks

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: i have a f150 with a pending code p0171 what can

Could be a few other things, but starting with the most common :

Intake air leaks, have you changed the air filter as of late, or installed an aftermarket air intake ( K&n, etc ) ?
- If so, check the entire intake to make sure the assembly is correct, this would be in the area after the MAFS ( Mass Air Flow Sensor ) which is in part of the factory air filter housing ( it is that post with the wire in it ).
Other Air leaks after the MAFS
- The most common place for air after the MAFS is the Rubber elbow on the back of the throttle body. The rubber 90* boot will get hard and crack, causing air leaks. This is a 25.00 ( ?) item at a Ford dealer, and easy to change. Check this from the 90* to the other end. This is usually the cause of a P0171 code, but not the only.
EGR leaks. Some times the diaphragm in EGR will be the cause of the problem. This is the flying saucer shaped dish on the driver's side of the engine.
Exhaust leaks by the O2 sensors. If you recently had exhaust work done, this could be the cause of it. With the factory SS system still intake, this is usually a non issue.

When you complete a repair ( if the Car MD will not clear the code ), you need to have 2 drive cycles to get a pending DTC cleared.
For Ford, this is 2 drives, starting with the engine warmed up, normal throttle drive up to a speed of at least 47 mph, and maintain with steady throttle for 10 min. Back down to a stop, and then repeat this for the second time. Fuel tank needs to be at least 3/4 full ( think that is it ) when doing this.

There are a few other items that have to do with the vapor recover, excessive fuel pressure, leaking fuel injectors or fuel regulator, or a low fuel pressure condition. These are not as common for the error.

Starting with the rubber vac line on the back of the intake, looking for cracks is a good place to start.

Posted on Nov 14, 2009

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SOURCE: 2004 ford f150 4x2 4.6 drive shaft has vibration

check the U-joints by grabbing the drive shaft and try to make it move from side to side or top to bottom.It is much easier to do this if the vehicle is in the air and no weight on the axle.If it does move replace that U-joint,but if you are going to replace one then I would do both since you will have the drive shaft out any way.Also check to see if the shaft weight is still there,but I doubt it has came off its pretty rare.

Posted on Jan 01, 2010

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An additional clarification to terian_5's suggestion of checking the vacuum lines, usually the rubber elbow on the back of the throttle body gets cracks in it.
Remove the plastic throttle body cover, and check the rubber elbow, and the vacuum line for this. You might have to look close, sometime they are hard to see.

Ignore the IAC notation in this picture, it is the best one I have that shows the rubber elbow, it is the elbow right below the text

This is ~ 20.00 ( + tax/ship ) from Ford to get a new one. Replace this, clear the codes and do 2 driver cycles ( steady throttle up to 47 mph min, back to a stop and back up to 47 mph again ).
If you do not have a code scanner to clear the codes, disconnect the battery fro ~ 10 min, reconnect battery, start let idle to warm up, and do 2 drive cycles.

Posted on Jan 23, 2010

  • 312 Answers

SOURCE: i have aqn 2004 ford focus wagon and the check

The generic code stands for lean fuel in bank 1

Posted on Jul 04, 2010

  • 3640 Answers

SOURCE: 2002 ford f150 error codes

a lot of time the 02 sensors are overlooked, it could be numerous things. but check or replace 02 sensors first.

Posted on Aug 12, 2010

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I have a 2004 flex fuel tahoe 5.3. P171 and p174. Codes on. Have replaced fuel pump , pressure reg., plugs and fuel filter. Hard to start but runs fine for awhile then starts acting up.

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I have a 2004 Ford f150 5.4 and I am getting a P0171 code by itself on and off. Whenever check engine light comes on the truck doesn't accelerate steadily but once the light goes off its fine. What co

Code 171 means the O2 sensor is telling the computer the fuel mixture for bank one is too lean. Bank one is the side with cylinder number one. The problem could be the sensor, or something else like an injector that is actually causing the fuel mixture to be lean. The sensor would need to be checked.

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1 Answer

2004 f150 5.4l dtc po171 and po302

po302 is engine missfire on #1 cylinder, this engine is bad on ignition coils going bad, don't try removing spark plugs because they will break off in cylinder head and then you have a big problem, p0171 is a lean condition, possible bad oxygen sensor

Sep 03, 2012 | 2004 Ford F150

1 Answer

Missing, running very rough at idle-very low idle. Engine codes P0011, P0022, P0171, P0300, P0305, P0307, P0316, P2198.

the P0011 and P0022 are the camshaft sensors (both sides) are over advanced--common problem on Fords, and is usually a defective VCT solenoid (variable cam timing solenoid)-it will cause your other codes (P0300 random misfire), P0305 (#5 cylinder), P0307 (#7), P0316 (misfire at startup)-P0171 is a lean condition on side 1, where #1 plug is located (look for a vacuum leak, but a faulty VCT could also cause this)-is there any chance the last oil change set this off? The proper viscosity is very important and may have caused these codes.

The P2198 is O2 sensor signal stuck rich bank 2 sensor 1. Has the engine or sensors recently gotten a bath in oil (seafoam?)-this code indicates something of possibly an over zealous maintenance procedure could have damaged maybe the MAP sensor, or more.... Unfortunately, you have a lot of company. At least you didn't crack a piston or hydrolock the engine. Seafoam is pale oil, naptha, and alcohol. With more detail there should be a reason for all those somewhat related codes-post more information.

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1 Answer

Have a '96 5.2 ... code P0171 comes up. Car hesitates/bucks. comes up lean bank 1. How do you fix it?

P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.

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1 Answer

Engine code P0171 is for what sensor?

Here you go :

That should answer your questions. Hope it helps!

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1 Answer

I have aqn 2004 ford focus wagon and the check

The generic code stands for lean fuel in bank 1

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