Question about 2003 Ford E250

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98 E-250 Rough Idle; codes p0156,p1131,p1151,p0301,p0171,p0174+

1998 Ford E-250. Rough idle/hesitating at idle. Drives fine. Check engine light on. Shows the following codes: p0156, p1131, p1151, p0301, p0302, p0303, p0304, p0305, p0306, p0171, p0174. Any help greatly appreciated!

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  • miwi97 Dec 15, 2008

    thank you! it's a 4.2. could running lean cause the misfire codes? should i be checking for a vacuum leak or a dirty MAF? fuel filter?

  • hanimal007 Jan 24, 2009

    2003 ford focus,,,codes po304, and po316 changed spark plugs...engine light still mon...car runs and idles very rough...any help would be appreciated

  • Anonymous Mar 17, 2014

    Already replaced plugs and e g r

  • Anonymous Mar 21, 2014

    exaust smells but good power

  • Anonymous Mar 24, 2014

    hesitating on pull off shuts off if gas is pressed to fast

  • Anonymous Mar 27, 2014

    engine came on and when you stop it idles rough and hesitates but then when you go again it runs fine

  • Anonymous Mar 29, 2014

    Check engine light ison, engine idles too high, slight hesitation when starting off (at times)

  • Anonymous Mar 30, 2014

    engine code p0301

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Po301 thru po306 all misfire codes cylinder 1-6 remove plugs and replace them..... set the plug gap first
i suggest u replace the wires also if they never been replaced all these misfire codes can set the others and one is for the oxygen sensor ( 02s or HO2S) CIRCUT MALFUNCTION do u know how to check wireing systems
do the tune up plugs (set gap) .052-.056 change the fuel filter also. clear the codes hows it run
this info is for 98 E-250 4.2Litre
what engine do u have 4.2L or 4.6L i know it is a v-6 by the codes

Posted on Dec 15, 2008

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I got the lean codes on my E250 98 Ford 4.2L. Turns out someone crimped wires together on the Fuel Injectors and they were not making good connection. So If its a rebuild look for crimp connections and fix them by soldering.

Posted on Mar 02, 2012

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dttech
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SOURCE: p0136 p0156 p0401 p0402 p1131 p1151 p0171 p0174

All of that going on all at the same time is not likely at all. Are you sure the engine is actually overheating or is that just what your instrument panel is telling you?
With all of those things going on at the same time, here is what I would do. First I would take a REAL HARD look at the charging system. Goofy stuff like this is often caused by a battery with a shorted cell or an alternator with bad diodes that is feeding AC current into the computer network. The computers tend to do really goofy things when they are suffering from malnutrition.

Once I am satisfied that the charging system is in good condition, then I would clear the codes and go on a road test. If the check engine light comes back on, I would immediately scan the engine controller to find out which of the codes came back and fix it FIRST. Many times, fixing one code can fix ALL the codes. By doing it this way, you are more likely to find which one is your MAIN problem.

If your engine is actually overheating, all I can say is you need to diagnose your engine cooling system to find out why...all of the misfire codes could very likely be a result of the engine overheating and fixing the engine cooling system will most likely fix these codes.

Posted on Sep 28, 2011

6ya6ya
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Posted on Jan 02, 2017

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1 Answer

Chevy Silverado error p1151


P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2


p1131 p1151 p0171 p0174 p1131 p1151 p0171 p0174
All of these p1131 p1151 p0171 p0174 codes indicate a problem with a lean condition. This engine is known for vacuum leaks, so before you start throwing oxygen sensors at the problem, it pays to perform some diagnostics.
Start by cleaning the MAF sensor. Spray the sensor with CRC MAF sensor cleaner. Next, check the plastic vacuum lines, especially where they meet with rubber boots. If they are cracked or the rubber is swollen, replace the line. Then check the rubber elbow that holds the PCV valve. That elbow is a know failure point. In fact, the entire PCV tubing is a trouble spot on these engines. (thanks Ford).
After you've checked for vacuum leaks, check the operation of the oxygen sensors. The easiest way to do that is to disconnect the sensor from the harness. Connect one lead of your digital voltmeter to the black wire on the sensor and the other lead to battery negative. Then start the engine and add fuel (either propane, starting fluid, or carb cleaner) into the throttle body to force the mixture to rich. You should see a corresponding increase in voltage as you add fuel (from 0 volts to slightly less than 1 volt). Start and stop the fuel enrichment and watch the meter to see if the volts drop as you stop adding fuel. If you see no change, the sensor is dead. Replace it.
You can also use the fuel enrichment procedure to locate intake gasket leaks.
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P1151P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2
P0174 system lean bank 2
P0171 system lean bank 1


This is the only info that didn't come back directly to FORD (yet still mentions it) instead of GM. Not to sure you got the correct code.

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1998 Ford E-250. Rough idle/hesitating at idle. Drives fine. Check engine light on. Shows


Hi, since the check engine light (CEL) is on you need to get the trouble codes read. Most auto parts stores will do this for free. If there isn't one nearby, any shop should be able to read it (for a charge) or you could buy your own code reader.

The code(s) you'll get will be in the format PXXXX like P0171 or similar. Once you have the codes you can look them up here to get a description - http://www.obd-codes.com/trouble_codes/

Or post the codes back here and we'll help you out. The next step is to get those codes though so you know exactly which areas of the engine to concentrate your diagnosis efforts on. Good luck!

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