Question about 2001 Ford F150 Styleside SuperCrew

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Code Po171, P0174 P0403 . Upon acceleration....truck is jumping. One code metioned Cyl 3 misfire

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PO 171 & 174-are O2 Sensors Codes,forget them,just be sure their screwed in tight. Yes ,they will come loose.
PO303-is a bad COP Coil,on #3 cyl ,may be one issue,very common on all ford products
PO-403 -is EGR related.-That probably is shot, also.

Had all thoses and more, on my Lincoln Ls

A misfire will set many codes,that while not unrelated,are not your issuse. You need to understand the symptom,is not always what caused the codes,or not the cause of the problem.

Posted on May 09, 2010

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Malfunction indicator lamp keeps glowing even after engine starts but no problem while running or at the time of starting the engine-is it harmful in the long run?

Posted on Jul 14, 2010

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4 Codes in computer


code p0128 indicates a mechanical fault ( could be the thermostat stuck open)
code p0174 -system too lean -bank2 ===causes --intake /exhaust leak--fuel pressure/pump--injectors--AIR system--hose connection/s
code po171 refers to system too lean bank 1 same as po174 with the HO2S sensor being the culprit. As to all being related . only by way of the o2 sensors
code p0442 is not connected to the first 3 as it is in a different section of the fuel system

Apr 09, 2014 | 2003 Saturn VUE

1 Answer

What does engine code po171 on a 2007 chrysler pacifica mean


A P0305 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. Did the codes appear after the new plugs/wires were installed? What about new Dist. cap and rotor?

Did you use quality parts?

Check for vacuum leaks (including manifold gaskets) on Bank 1 (Driver's side).

Also swap Cyl.#5 injector with another cylinder and see if the misfire code changes.

Are you sure #5 plug is firing?It's possible the cat may be restricted, but I would first swap #5 injector with another cylinder and check for vacuum leaks.

A plugged cat/exhaust system will not set a P0171.I'd say first check the intake manifold gaskets (two of them) for leaks. There are other things that could be causing those common but pesky p0171 and p0174 codes. I would recommend you search the forums on those two codes as they're pretty common.

The P0442 code is likely not related

Feb 15, 2012 | Cars & Trucks

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I have my engine light on, in my xg300 Hyundai 2001 if i replace the mass air flow sensor and my fuel air metering my light go off, Im a woman trying too fix my car my self pls help tks code...


check engine light will not go out or codes cleared till computer is cleared so if you have set off a code while trying to diagnose it will stay in memory with that in mind

PO171 & 174 are related to bank 2 lean o2 sensor reading high oxygen in exhaust at sensors
PO120 has to do with throttle position sensor input out of range
PO306 is a misfire in #6 cylinder

in my opinion any miss will cause o2 sensors to read lean because the cyl is in effect a air pump sensors only pick up o2 not the fuel does you engine run rough or hesitate/shaking on acceleration
i would check coil wire and plug for #6 also the injector not working will cause miss also they look ok do compression test on cyl will read 150psi if you find cause of miss you will be able to diagnose lean

with the tps sensor check to see if the connector was disconnected at any time you were testing

basically you need to isolate misfire and fix then have the computer cleared of codes drive car and if engine light comes on then we will go through test procedures for new codes

i hope this helps you to get a few ideals on how to proceed good luck ley me know

Jan 16, 2011 | 2001 Hyundai XG300

1 Answer

Lack of fuel when accelerating


This might help. It looks like you O2 sencor had gone bad or the signal has and causing multiple mis fire. according to your codes. 
PO171 System too Lean (Bank 1

PO174 System too Lean (Bank 2)

PO300 Random/Multiple Cylinder Misfire Detected

Causes of PO300
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns

I'ld start with chaning the O2 sensors first but sheck for bad wire connection. Hope this helps and good luck

Apr 08, 2009 | 2004 Ford F150

3 Answers

2001 Toyota corolla hesitates on acceleration


Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust).

Mar 27, 2009 | 2001 Toyota Corolla

1 Answer

1999windstar missing prob


check the pcv valve vacum lines for a leak a vacum leak will set 171 174 codes. lift the hood with engine running and listen for a air leak , check all vacum lines if no vacum leaks can be found then clean the mass air flow sensor by spraying carb cleaner directly on it for about 5 seconds. in other words take the air filter cover up and spray down the tube that leads to engine. shine a light down hose first and see if u can see the mass air flow sensor so u can get a direct hit

Jan 13, 2009 | 1999 Ford Windstar

2 Answers

Diagonostic trouble codes reported p0171 p0174 p0302


P0302 is cyl #2 misfire and the other 2 are lean or rich codes because of the misfire repair code P0302 first and the other 2 codes will most likley clear up.

Aug 05, 2008 | 1997 Ford Econoline

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