Question about 1996 Ford Mustang

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Code p0171,p1407 hi thanks in advance my 96 mustang whith 3.8 a is trowing codes have replaced parts from previous codes today she had a fit and produced codes p1407 p0171 lean bank and egr no flow any suggestions this ride has a guestimated 400,000 miles and runs strong no smoke just codes thanks

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Firstly block off the EGR with a coca cola can somehow its not necessary ,as for the lean on one bank then read the OBDII with a code reader and with the engine running read the and compare the O2 values ,it may just be a defective sensor on that bank and as its a 96 then it might only have one O2 sensor and not two ,well either way the lean reading is the O2 sensor for sure but which one if two are fitted which it could well have as its a american market vehicle

Posted on Feb 07, 2014


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Posted on Jan 02, 2017

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SOURCE: Ford Windstar 1996 Trouble Codes P0171, P0141, P0161, and P0174

Bank one is toward the front of the vehicle. Sounds like the heated oxygen sensors have gone bad. The Oxygen Sensors are located in the exhaust pipe and require a special socket to remove and replace.

Posted on Jan 16, 2009

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SOURCE: Code #P0171 & code #P0174

The most common problem on a Ford with these codes is deteriorated PCV hoses. Check the hoses from the PCV valve to the intake manifold. Pay special attention to the rubber elbows. They often crack on the inside curve and the crack is hard to see.

Posted on May 22, 2008

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96 taurus gl no start

t . You have a code reader ? you need a professional type scan tool that shows sensor data PID's Ford EGR Flow Testing P0401 P0402 P0405

A P0171 / P0174 lean exhaust code could be a plugged filter , vacuum leak , low fuel pressure . Your best bet take it to a qualified repair shop that has diagnostic tool's do diagnose ! Causes of lean condition trouble codes P0171 P0174 GM 5 3L

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I connected a scan tool to my 1997 mazda 626 and I got 3 fault codes P1407,P0303,P0171please help

My advise is to look at what moistcabbage had to say about your problem. Then I will add a little advise:
Put the P0171 on hold until you have a verified fix for the other 2 codes. Here's why:
A misfire causes raw fuel and air to be shoved down the exhaust as an unburned mixture (After all. that's what a misfire is.) This can cause the free oxygen level in the exhaust to rise and cause the lean code (P0171) From the EGR code that you have, I can tell that you have the 2.0L engine in your car. (This is not a valid code for the 2.5L) In this case, moistcabbage is sort-of correct. Thiscode actually indicates that the EGR valve does not move when the computer commands the EGR to open. (Which SHOULD also be producing a P0400 code, which is EGR no or low flow.) If P0400 is not present, then chances are that this is caused by the EGR sensor "lying" to the computer and telling it that the EGR is not opening when it really is. However, it also may be telling the truth and the computer just hasn't picked up on the low flow issue yet. Anyway, if the EGR is not moving, it could be caused by a vacuum leak, which will also cause your P0171code.
The logical order of this would be to check for obvious causes of misfire like the spark plug, wire, coil, and fuel injector and correct as necessary. Also check the EGR system out to find out what the cause of the EGR not moving code is. (And repar as necessary) Then clear the codes and drive the car to see if the P0171 code returns. If P0171 returns and the other codes stay gone, then you will have to check into oter possible causes of the lean code. Otherwise, I would not waste any time checking into a lean condition at all before the other two codes are confirmed fixed.

Mar 11, 2011 | 1997 Mazda 626

1 Answer

Wat is a P1407 fault code....I connected a scan tool to a 1996 mazda 626 and I got three fault code P1407,P0303,P0171.....I need help

p1407 is egr system no flow

p0303 is cylinder 3 misfire

po171 is fuel control system is lean

you might want to start by checking the mass airflow sensor bolts as they tend to come loose.and that should take care of the po171. check the hoses for the egr, if all is okay possibly the egr solenoid might be faulty. for the p0303 check the sparkplug on cylinder three and the spark plug wire, if you have an ohm meter you can check the resistance of the wire by hooking up your test leads to either end of the wire (after removing it from the engine) and make note of the resistance...then replace that wire and remove another one and test it the same way.. the results should be about the same, if you compare a shorter wire then the resistance will be slightly lower...just as if you test a longer wire it will be a little more. hope this helps

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1 Answer

Replace the EGR valve reset error code and now i get error code of p1407 what do i do now

The most likely cause of this code is a DPFE (differential pressure feedback EGR sensor).

The code 1407 indacates low or no EGR valve flow, this is normally caused by carbon build up in the passage in the intake where the valve mounts. Click over pic to see attachment...


Hope this helps.

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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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p0136 and p0141 are o2 sensors and p0401 is a egr flow and the p0171 means its running lean on low bank 1

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P1407 EGR No Flow Detected
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sounds like it , the sensor should be on the exhaust somewhere,whith wires on it

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