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2000 jeep cherakee throwing p0171 - 2000 Jeep Cherokee

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P0171 OBD-II Trouble Code Technical Description 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 Possible solutions include:
  • 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
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

Hope this help.

Posted on Apr 28, 2010

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  • Master
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P0171 is the data trouble code for (fuel trim system lean bank #1) this code can be set by a few different things, and the most common are loose hose clamps or other air or vacuum leaks between the throttle body and the MAF (mass air flow meter/sensor), a vacuum leak on the bank #1 side of the intake manifold, a leaking fuel injector seal on the #1 bank, but by far the most common problem is a dirty MAF.

The #1 cylinder bank is on the side of the engine with the #1 spark plug.

I hope that this information has been any help at all to you, and let me know if you require any further assistance with cleaning the MAF.

Posted on Apr 28, 2010

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  • Jeep Master
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System too lean,bank 1 ,,have the fuel pressure tested,the fuel pump maybe weak,also change the fuel filter,it could be restricted.

Posted on Apr 28, 2010

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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

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