Ford F-150 (2009-2014) :: Intermittent Check Engine Light Due To Same Code Every Time - P0171
Aug 23, 2016
For the last few months my truck has been throwing an intermittent check engine light due to the same code every time - P0171. The dealer has allegedly checked everything and has given me the "We have done all we can do" speech. Lead tech even suggested that since today's fuels have alcohol in them, that a check engine light would be normal. The truck has been in the shop 3 times with no success or even remote possibility of what the problem could be.
The check engine light has since gone from intermittent to constant and comes back on after 5 drive cycles after clearing with an OBD2 scanner. Also, I'm now getting a P0174 code.
Personally, I think they're trying to blow me off because I'm a few months and about 2k miles away from being out of CPO warranty.
Truck is a 2013 F150 Super crew 2wd 5.0 with about 45k miles.
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He has a 2013 F-150 XLT with the Ecoboost. He has 29,000 miles on the truck.
He is ~1,300 miles into his trip; and has about another 4,500 to go! On Friday, his check engine light came on (while towing). The next day it went back off. Yesterday, the light came back on (while not towing this time). He took the truck into a Ford Dealer in Rapid City, SD this morning. The CEL light was still on this morning when he arrived at the dealership. The dealership said the code is P0299 - Turbo Underboost.
They said they've run tests and can find nothing wrong. Naturally, he is not very happy being this far from home with 3 more weeks of vacation left and his truck acting up. Especially since the CEL light is on but the dealer can find nothing wrong. I'd be puckered-up too!
Experienced this Turbo Underboost condition? What was the cause? How can the CEL light be on but the dealership not be able to find a problem?
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I have a 2009 ford f150 4.6l 3v v8 standard cab with about 53k miles on it.
Recently the check engine light came on so i went to autozone to have the codes pulled for free, it says i have a small evaporative leak.
They said may be the gas cap, but the thing is, i have a quick fill cap that came in stock with truck so the gas cap isnt even needed.
I've looked under the hood, and noticed that there is little pool of oil on top of the valley of the engine on the passenger side of the engine, could it possibly be the PCV hose that is bad and be related to the evaporative leak code? or its unrelated and i have a bad gasket for the valve cover?
It isn't affecting the performance of the engine,.. yet. I have a road trip for my work coming up very soon and i wanted to try to fix it before then.
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Well my girls 2006 passat is showing the check engine light. she took it to autozone and the code was, P0171. what does the code mean and what do i need to replace?
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I just bought a 99 f150 and the check engine light came on with code p0171,system too lean bank 1. It runs and drives fine but has a strong smell of gas when I shut it off.
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I have a 2014 camry SE 2.5 with 66.000 miles on it and been having issues since the warranty expired..... What it could be? Cleaned the maf sensor and still no luck and every time i fill the gas tank it won't start takes a while.
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First owner, 192000 miles. Check engine light came on during last winter, I put fuel injector cleaner with gas and it went away for a while. It came back on, if i reset, I can drive for about 50 miles before it comes back on line. Also, may be two or three times a week, when moving after a stop, the vehicle stalls, i have to take the feet of the gas pedal and give gas again.
I called up the dealer asking for fuel filter and fuel injector parts prices. Fuel filter is in the gas tank and not meant to be replaced. The fuel injector I was told 4 x $155 each. For diagnostics they need $100
See attached, I was able to clean sensor 1. I could not unscrew sensor 2, the screw is rusted, plus there is no room to get a longer screw driver and turn.
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2000... I have a code P0171 bank 1 too lean. My question is does this exclude anything that will effect both banks? If it was MAF sensor or fuel filter would it set code and say banks 1 and 2 running too lean? In which MAF sensor ohms out correctly. I cannot view fuel trim files. I have looked for a vacuum leak with no luck. I got some cigars to try to smoke it to see if there is any vacuum leaks. Trying to narrowing what i need to checks.
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I have a 2006 Chevy Trailblazer LS/LT 4.2 liter 2wd. I have been trying to get it smoged, but can't clear the code. P0171 - Lean Bank 1.
I've been having a parts throwing contest with it, but it has been winning and my wallet is losing.
I have changed the air filter, cleaned the MAF sensor, changed both O2 sensors, changed the secondary air valve and relay. I've done the carb cleaner spray test around the intake and vacuum lines, with no spikes in RPM.
Most recent try was a couple bottles of Techron concentrate with premium chevron gas.(still waiting to see if the code hits again)
Next steps are checking the intake bolts(to see if they are torqued) and intake gaskets, check for exhaust leaks at the exhaust manifold, and checking the MAP sensor.
Freeze frame data from the most recent hit on the code is below.
***Fuel system 1 - CL***Fuel system 2 - NA***Calc Load(%) - 30.2***ECT(deg c) - 48***STFT B1(%) - 3.9***LTFT B1(%) - 22.7***MAP(kPa) - 33***Eng RPM - 809***Veh speed(km/h) - 0***Spark Adv (deg) - 10.5***IAT(deg c) - 20***MAF (G/s) - 5.82***TPS(%) - 15.3***Air status - NA.
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We have a 2003 Passat 1.8t. Had the Check engine Light come on. Went down to AutoZone and hookeded up the OBDII reader. Came up with P0171, Fuel System for Bank 1 was too lean. Probable causes:
1. Fuel Pressure of MAF (If Bank 1 & Bank 2 set codes together)
2. O2 Sensor
3. Ignition Misfire
4. Fuel Injector Problem
Car has 60K - has always run well. Wife says she thinks it's running a bit sluggish. I rarely drive the car, but I think she's right. Car is not missing or running rough.
I cleared the code & started the engine; Check Engine Light is off; then looked at the codes and I find a P0171 (Pending). She tells me that the light has been on before & then gone away. So I guess it clears itself, but eventually comes back.
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My 2007 Explorer (XLT, V6 4.0L, 4WD, 175k miles) has been experiencing a check engine light, intermittently, for the past few months. I took it to AutoZone to read the code and they gave me a printout for P0193. For awhile, the light would go off after I filled the tank with gas (usually the next day) and would come again as the level in the tank decreased (typically around 1/4 of a tank). Then about two months ago, the behavior seemed erratic and I could no longer predict when it would appear. During the past couple of weeks I only recall seeing the CEL once (briefly); it's mostly been off. Saturday night I was out driving and it came on again.
About two hours later, my vehicle "conked out" on me. It started hesitating (it's been a very long time since I've run out of gas, but that's what it reminded me of). Fortunately, there was no traffic and I was able to get it off the road but didn't have enough momentum to get it into a defined parking space before it quit. I sat there for awhile pondering my options (not too many since it was the middle of the night and I don't have road service). After about 10 mins or so, I decided to see if I could get it started. It did start and I was able to drive it home (< 10 miles). It's been sitting in the driveway since because I'm afraid of getting stranded if I drive it again. BTW, I was low on gas when it died -- about 50 miles to E (was headed to the gas station when it happened, but took it home instead).
After everything I've read the past few days, I'm expecting that I need to replace at least the fuel filter, the fuel rail pressure sensor and the intake gaskets for the manifold. I am not a mechanic, don't have diagnostic tools, my funds are really limited right now and I'm pretty much on my own to figure this out.
Q1: For those who may have some knowledge about this particular issue, does the intermittent nature of the CEL give any clues to which part(s) might be malfunctioning?
Q2: I found a replacement FRPS made by Bosch on Amazon, significantly cheaper -- is this brand ok or should i stick to Motorcraft?
Q3: Any advice on the manifold gasket replacements (is one brand better than another)?
Q4: Do I really need the special tool to replace the fuel filter?
The questions above are no longer relevant. I'm in the process of "locating" the sensor. I have the air hose and throttle body off. Now I'm looking at the EGR valve. It looks like I will have to disconnect the it from the large pipe beneath it. Will I also need to remove the two smaller bolts that mount it to the manifold cover, or can I remove the cover & valve together? It looks like those little buggers are going to be challenging since they are facing the back of the engine compartment. This is rather slow-going for me, but there's no turning back now.
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My Focus has 102,000 miles. It has thrown a p0171 code and I have been attempting to fix it. So far this is what I have done:Changed MAF, air filter, PCV Valve, plugs, Valve cover gaskets, Bank 1 O2 sensor and fuel filter. All new. I have cleaned the throttle body, fuel rail intake manifold. Cannot hear vacuum leaks and tested for leaks with carb cleaner.
Symptoms: engine cranks but has a hard time starting, usually on second try. When tank is about half full I get Rough acceleration, higher RPMs (doesn't change gear) and engine stalls on hard left turns. Idle gets rough at times but usually stabilizes at around 700 rpms.
At the beginning, #1 spark plug chamber had a lot of oil in it. It's been a few months and no oil after Valve cover gasket and PCV change. Tested coils and the plugs get a spark. Before I start messing with the fuel pump, am I missing something else that I can do?
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My 2014 F-250 is having a repeat problem with an intermittent cell engine light. About 10000 miles ago it happened, and they changed out the egr cooler. Saying it was gummed up with soot. Problem just started up again. Light will stay on for about 3 or 4 restarts then sir off on its own. It's this a known issue with the 6.7? Is there a way to prevent it?
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I have a 2013 F150 6.2L and it wont start. It was running great and when I drove it around the corner it just shut down no clunk no warning just bam shut off. I had a engine code P0355 ( which indicated cylinder 5 coil malfunction). changed the coil and it will not fire the engine code has gone away but it will still not fire. I changed the oil just to be safe and no metal shavings in it.... Turns over just fine but will not fire. I added more fuel just to be safe ( thinking maybe I had bad fuel but that didn't work either.
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I have a 2006 Sonata with an intermittent check engine light. The light will be on for a few days then goes out for a day or two. This pattern has been going on for about 3 months now. A scan tool was used and showed the code P0011. I know this code has to do with the camshaft timing. My question is should the light be going out on its own if there was a problem with the camshaft timing? Does the engine correct itself and then experience the problem again. Is it normal for check engine lights to go on and off with out being manually reset? Could this be a faulty sensor or loose wire causing the light to go on and off? The car has about 75,000 miles, mostly Hwy, and is driven just about everyday.
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My 2009 f150 5.4 v8 went from 18 MPG to 13 MPG and the check engine light is on?
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2010 F-150 5.4L 3V gas, 6 speed auto, 2WD.
I got a Bully Dog GT Platinum Gas with plans to purchase a tune from 5starturning. Was messing around and loaded the built in 05-10 Ford Gas tune in Bully Dog... all went well.
Take it for a drive around and next thing I see is my check engine light is on so back to the house and revert back to the factory file... again, all went well.
No such luck; still have the check engine light and the Bully Dog says there are no DTC codes. Needless to say, I'm a bit freaked out.
I have tried uninstalling the Bully Dog tune and reverting to factory file and still no luck.
I think I would feel better about it if I could just find some comment saying "this is common just unhook the battery and reset and go on your merry way".
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Purchased certified pre owned 2009 f150 may/2010 24,000 mile. The check engine light intermittently comes and goes. It seems that its either cold temperature or related to filling the gas tank. The first time it appeared I drove 100 mile then the truck sat over the weekend and went back off when started. The second time had serviced for the check light and the dealer diagnostic pin pointed P0304, P0305, P0300 and P0316 and replaced cyl 4&5 coils.
Prior to the replacement of the coils the truck averaged 18.2 mpg since the repair the mpg dropped to 17.6 and now at 17.2mpg. Had the truck in again and the light was on when I made the appointment but went back off when I went to the dealer. They said the reset the computer. The light twice has since went on and then back off after a couple days. The only observation is that the outside temperature on both occurrences has been below freezing and that I had filled up the tank.
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My 2005 Dodge Dokota 4.7L V8 152,000 miles has an intermittent check engine light (CEL) code P0420 ('catalylst efficiency') that turns itself off.
1) 151,000 CEL on, code P0420, checked, cleared at dealer.
2) 151,948 CEL on, code P0420, checked, cleared at dealer (Cat Conv).
3) 152,200 CEL on, code P0420, checked, cleared at local auto parts store.
4) 152,597 CEL on. No checks.
5) 152,815 CEL turned off on its own
6) 152,849 CEL on. No checks.
7) 153,137 CEL turned off on its own.
Twice in this time CEL has came on soon after a fill up from near empty.
Engine runs fine, 18-19 mpg highway.
Have seen numerous on-line reports of other possible causes:
a) base engine problems (coolant or oil) -- coolant temp sensor
b) Air inleakage -- air systems or manifold
c) Lazy front O2 sensor
d) fuel pumps
e) timing or misfire
f) what else? - (gas cap, other...)
What to check first or categories to eliminate?
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After about 5 miles from my normal place to purchase fuel, My truck bagan to run bad and the check engine light kicked on. Mileage dropped to about 8 MPG. This morning, the truck would not start and after 2 can's of dry gas, I was able to start it (barely).
I stopped at the place where I purchased fuel and at least they admitted that they has to shut down yesterday, stating they received a bad batch of fuel from their source.
Now the fun begins...How do I get the "bad gas" out of my truck?. I now have about 1/4th of a tank. I tried to run a line to siphon the gas and I can not get a line far enough into the tank.
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I have a 2003 Elantra GLS. I am intermittently Check Engine light and error code is P0113 - Air Intake sensor issue. I can't locate where the sensor is. I don't see any wire coming of the tubing that connects the air filter to the engine.
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