Question about 2000 Ford Escort

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2000 ford escort ZX2 with P0171 trouble code. Cleaned MAF, replaced MAF, replaced vacuum lines, replaced upstream o2 sensor. No change. Any ideas?

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  • geraldallred Jun 02, 2010

    2000 Ford Escort zx2 P0171 code. Idles rough and erratically. Checked vacuum hoses, cleaned then changed MAF, changed upstream 02 sensor, changed fuel filter. I don't believe it's the fuel pump, runs fine at speed. There is no IAC or EGR (variable valve timing) Could it be a head gasket? Will a compression test show it?
    Any ideas?, Thanks.

  • geraldallred Jun 02, 2010

    2000 Ford Escort zx2. Runs fine. Idle is rough and erratic. Changed upstream 02 sensor, MAF, Fuel filter, vacuum lines. There is no IAC or EGR on this car. Getting P0171 code (running lean). Any ideas?

    Thanks

  • Anonymous Mar 12, 2014

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  • Anonymous Mar 27, 2014

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  • Anonymous Mar 27, 2014

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5 Answers

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I am working on the same problem. This 2000 ZX2 was idling rough and throwing a p171 code (bank 1 too lean). I hooked up a scanner to the OBDII port and you could see the O2 sensor at 0 or very low voltage and not switching and the fuel compensation maxed out which indicates a lean condition. Using a flammable Carb cleaner and the engine running I sprayed around the vacuum hoses until the idle picked up. I found a rubber elbow that connects to the bottom of the intake maniflold and feeds vacuum to the PCV valve. Replacing the the elbow with a suitable replacment from the auto part misc parts cards display had it running smoothly and the O2 sensor switching properly. Since this was happening at idle it was not the fuel filter which can cause a lean condition in upper rpms. It is not the MAF or the O2 sensor since it switches when not at idle. Also check the smaller vacuum lines that go to the evap control from the intake vacuum ports (back of manifold just below the throttlebody, most will be cracking if your car is anything like mine. I have also seen this problem with a bad PCV valve.

Posted on Jun 14, 2010

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P0171 simply means that bank one is lean!
It does not mean the 02 is bad
I'm guessing the auto parts sold you the O2 after they pulled the code... I hate that

So if you want to fix first, first thing we have to understand is what parameters the PCM is looking for in order to set the code... basically the PCM has some extra give/take it can use to control the fuel/air mix

in your case it has commanded the injectors and extra 25% and still cannot see, what it assumes is the correct switch rate of the O2 sensor

So what can cause this...

  • Fuel system
  • Induction System (air intake)
  • EGR
  • Base engine

While I did not list these in any particular order FUEL is your most likely cause at this point. Things like...
  • weak fuel pump
  • dirty injectors
  • clogged fuel filter
The next thing I would do in your shoes, assuming ALL maintenance is taken care of like, filters, plugs and wires, is...
  1. measure fuel pressure and volume
  2. run a power balance test (you'll need a pro scan tool)
  3. do a compression test
if you need an further assistance please let me know
Sean

Posted on Jun 02, 2010

  • tommyshow Mar 16, 2011

    did the same. I found a hole in the return line from the crankcase vent. the hole was on the very back side of the motor where the line hooked up to the throttle body. replaced with new from dealer hose and the error never came back.

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P0171 OBD-II Trouble Code - System Too Lean (Bank 1)

What does that mean?
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

Symptoms
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

Causes
A code P0171 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak downstream of the MAF sensor.

Possible Solutions include:
1.- In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
2.- Inspect all vacuum and PCV hoses, replace if necessary
3.- Check for a dirty fuel filter and proper fuel pressure

Are you mek the items 1 and 2; try the item 3. I'd say first check the intake manifold gaskets (two of them) for leaks.

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Posted on Jun 01, 2010

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Check your battery conenection on the back of your altanater and chang O conector out the wire sometimes gets hot and curent is not getting to the eng systom

Posted on Jan 28, 2011

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Hi! One thing that can resolve this is by replacing your fuel filter. The po171 code is related to a faulty MAF and vaccum lines but youre done replacing this and thats a great move. The last thing to do is to replace the fuel filter to resolve the problem. Hope this helps and have a good one!

Posted on Jun 02, 2010

  • dj_relly999
    dj_relly999 Jun 02, 2010

    Once the fuel filter is changed and still does the same thing I strongly suggest the the ECU(engine control module) be reprogrammed. The ECU controls the air and fuel mixture that can correct the erratic idling.

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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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