Question about 1998 Jeep Grand Cherokee

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98 jeep grand cherokee diagnostic codes

The codes that i got are po171 system to lean bank 1, and po131 02s ckt low volts 1. can anyone explain to me what to fix and what problems do these codes cause. the problem i have is car runs rough, idles very low almost stalling while stopping or stopped and when parked, hasnt stalled yet, exhaust stinks bad, sputters while driving. the problem is getting worse everyday. please help me.

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Sounds just like mine and after a lot of headscratching it looks like mine has the common fault of a crack in the manifold which is allowing oxygen rich air in and giving false readings leading to the ecu overcompensating hence the lumpiness unless you have your foot down when theres plenty of output from the engine and correct readings. AND/OR a faulty sensor in the manifold. I know i have a crack in mine just above the donut joint i can hear and see it so have ordered a twinflex replacement stainless item will then get it back on computer and next step is replace sensor (twinflex around £100 for item on ebay)

Posted on May 19, 2009

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Change fuel filter. you have a lean conditions and vacuum leak in intake check all vacuum hoses and pvc valve.replace plugs and wires if they have not been change.if all is good get it scan egr valve cause rough idling and stalling.

Posted on May 17, 2009

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2 Answers

What does code po171 mean


System too lean (bank 1)
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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
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TPS VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE CLOSED
TP SENSOR SWEEP
MAP SENSOR OPERATION
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ENGINE MECHANICAL PROBLEM
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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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Po171 po174 code


Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .

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What are the following Code definitions on a 1996 Ford Contour: 157, 158, 159, 181, 327, 332


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PO121 code still on, replaced o2 sensors, replaced cracked air tube, put seafoam in gas. reset computer, light came back on after 40 miles. same codes. DIAGNOSTIC TROUBLE CODES PO171 System Too Lean...


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Generic code PO171 system 2 lean bank 1 generic


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2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


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On those 2 codes, you have to do some testing to find out why there is a misfire.
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dirty/malfunctioning injectors
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fowling spark plugs/wires
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1 Answer

PO171 OBD-II Trouble Code " System Lean To Bank 1


Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

Dec 28, 2008 | 2000 Jeep Grand Cherokee

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