Question about 2001 Ford Escort ZX2

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I have a 2000 frod escort zx2 that has a p0171 Code from autozone. A p0171 is bank 1 running lean code. I have been informed to change the o2 sensor but i dont believe this will fix the issue...any suggestions

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Check hoses to pcv valve
they tend to rot out cauing it to run lean

Posted on Oct 31, 2009

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Assuming plugs and wires, coil, vaccum line are good. I would go ahead and replace O2 sensor if it has over 75k miles and recommended, the airmass flow sensor and O2 sensor and map sensor all work in sync measuring amount of fuel and air mixture and exhaust compute by the ECU. If one of those unit fail the ECU will throw a code.

Posted on Sep 24, 2009

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DO NOT JUST REPLACE 02 YOUNEED TO SEE WHAT FUEL PSI ARE AND MAKE SURE NO VACUM LEAKS IT COULD BE DIRTY MASFLOW SENSOR IT COULD BE EGR STUCK OPEN LITTLE

Posted on Sep 24, 2009

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I have a PO171 code on my 1999 Jeep grand cherakee larado can You tell me how to fix it, Thank You.


  • Dale, code P0171 fuel system too lean
  • Possible causes
  • change fuel filter first, if it has not been done recently
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
O2 SENSOR
O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
O2 SENSOR HEATER OPERATION
TPS VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE CLOSED
TP SENSOR SWEEP
MAP SENSOR OPERATION
ECT SENSOR OPERATION
ENGINE MECHANICAL PROBLEM
FUEL FILTER/PRESSURE REGULATOR (HIGH)
PCM
Check the attached links,
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

2000 Jeep Grand Cherokee p0171

Possible problems related to Code P0171 Jeep Garage Jeep Forum

P0171 System to Lean Bank 1

Code P0171

Mar 11, 2016 | Cars & Trucks

1 Answer

What is p0171 p0174?


P0171 Fuel trim bank one condition Lean (If bank one and two codes set together suspect fuel pressure or MAF sensor. Or O2 sensor defective
P0174Fuel trim bank two condition Lean (same as above or Failed H02S21 Heated O2 sensor Bank 2 sensor 1)

May 11, 2014 | 2000 Jeep Grand Cherokee

1 Answer

What does code system to lean bank 1 mean on my 2000 lexus rx300


It could be caused by many things, but generally it means that your engine is running too lean - usually indicating a vacuum leak. It could also be that the O2 sensor is bad and giving a false reading.

Apr 10, 2014 | 2000 Lexus RX 300

1 Answer

What does the trouble code PO171B mean on a Ford Escort ZX2


P0171 is O2 sensor indicates lean. You probably have a vacuum leak. The most likely and common cause is the PCV elbow at the front of the engine.

Aug 18, 2010 | 2001 Ford Escort ZX2

5 Answers

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


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.

Jun 01, 2010 | 2000 Ford Escort

2 Answers

Codes P0171, P0174, P0440


This is usually an oxygen sensor, replace the O2 sensor located above the catalytic converter before replacing the evaporator purge canister.

Dec 29, 2009 | 2000 Chevrolet Silverado

3 Answers

Engine code p0171 right bank running to lean


This sounds like an O2 sensor, there are 4 O2 sensors, 2 for each bank, 2 up stream by the exhaust manifold and 2 down stream by the catalytic converter. However the information you have given is limited, the explanation for the code seems to be missing some information. Ex: right bank sensor 1 to lean.

Sep 02, 2009 | 1997 Pontiac Grand Prix

2 Answers

Oxygen sensor ford expedition p0171


this is a lean code bank one the o2 is not the problem it is working because it gave lean code a o2 code would be136 or 138 depending on which one .i would suspect vacuum leak in pcv hose assembly .this a common problem.if you still want to change 02 it will be passenger side upstream 02 which just below exhaust manifold.171 says lean bank one and bank one is the side were #1 cylinder is pass side. i hope this helps and please rate my answer thanks.

Feb 01, 2009 | 2000 Ford Expedition

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