Question about 2004 Jeep Grand Cherokee - 4.7L V8 - Catalytic Direct-fit Catalytic Converters - 49-State Legal

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Running rough - how do I fix it?

Code P0171 which says: A lean air/fuel mixture has been indicated by an abnormally rich correction factor.

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For any codes you get use Google
OBD Code PO171

Posted on Aug 14, 2013

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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

How do I fix a code P0171 (too lean)?


code p0171 refers to system too lean bank1===causes intake/exhaust leak-AIR system--MAF/VAF sensors---fuel pressure/pump/regulator---injectors---HO2S. To understand the fuel mixture there is a direct ratio between the air and the fuel and it is 14:1 air to fuel . Anything either side is too rich or too lean. manifold leaks/vacuum hose leaks--Mas air flow sensor, Volume air flow sensor all tell the CPU what the ratio is so any unit not performing will throw out the ratio. If the fuel pressure is too low or high the injectors do not squirt properly at the rpm required

Nov 30, 2013 | 2000 Pontiac Grand Prix

1 Answer

Po171&po191on audi a4 2007


P0171 indicates the system is running too lean (too much air, not enough fuel). P0191 indicates a problem with the Fuel Rail Pressure Sensor Circuit Range/Performance. Low fuel rail pressure could cause the Lean condition. Replace the fuel rail pressure sensor, and you'll probably correct the lean mixture error. Clear the codes and drive it to see if codes re-occur. Good luck.

Sep 29, 2013 | Cars & Trucks

1 Answer

I get code 51 on 1996 dodge caravan....fuel system lean---a lean air/fuel mixture has been indicated by an abnormally rich correction factor. The van runs fine when engine is cold but will sputter and...


the code is telling you where the problem is. Try replacing the HO2S sensors as the cpu is having trouble keeping the air /fuel mixture within limits. Check the cat converter for cracks or blockages . Have a pressure test done on the fuel manifold to check for pump/filter and pressure regulator problems. Check the ambient air temp sensor and coolant temp sensor as they also affect the air/fuel mixture.

Sep 23, 2013 | 1996 Dodge Caravan

1 Answer

Runs rough - how to fix


Check for vacuum leaks, Bad intake sensors, worn injectors, Restricted intake air, bad EGR valve.

May 03, 2013 | 2004 Jeep Grand Cherokee - 4.7L V8 -...

2 Answers

Cod of 51 on grand cherokee 5,2 which o2 sensor is out of order


Well, code 51 means the O2 sensor is telling the computer the fuel mixture is lean. So the computer tries to make the mixture rich by opening the injectors longer. I doubt the sensor has failed, but rather your fuel pressure is low.
If the sensor has failed and pressure is normal, you should have black smoke coming out the exhaust pipe.

Dec 10, 2012 | Cars & Trucks

1 Answer

I have code p0507 & p2187 on my 2004 Saab 93 the idle is rough



Combustion engines operate by burning an air/fuel mixture of about 14.7 to 1-14.7 parts air to 1 part fuel. When the air ratio goes below 14.7 parts, this is called a "rich" mixture. If the air rises above 14.7 parts, it is called a "lean" mixture.

Rich Mixture = Too much fuel, not enough air
Lean Mixture = Too much air, not enough fuel

To keep the engine running properly, the Engine Control Module measures the oxygen content in the exhaust with oxygen sensors and makes adjustments to the mixture by injecting more or less fuel.

P0507 Idle Control System RPM Higher Than Expected

P2187 System too lean at idle

Things to check:
1. MAF
2. Fuel pressure, fuel pump flow rate

Do you have cold air intake?

Run a fuel system cleaner first and reset software. Long Term Fuel Trim Additive. Max Value, Air/Fuel too Lean.

Fault symptom


Malfunction Indicator
Lamp

The engine may stop after starting, run unevenly and misfire or run
at high rpm.


On-board diagnosis

Type of
diagnosis:


Continuous

Enable criteria:

The engine has started and lambda control is active.An additive adaptation is
carried out.Cooling and intake air temperature 60°C.Fuel level at least
12%.

Fault criteria:

The additive adaptation factor is greater than 5.25%.

Diagnostic help

Diagnosis
regards:


Checking air/fuel ratio. With this DTC, the engine will be getting too much air or too little fuel.IMPORTANTA crankcase ventilation leak may be one reason as to why a DTC is set. Check crankcase ventilation function before starting regular troubleshooting.

Functions in the diagnostic
tool related to the fault:


Test value:
•O2S1 lambda
•Additive
Adaptation
•Short Term Fuel Trim
•Purge Adaptation
•Airmass Deviation
from Calculated
•Total Fuel Trim Here's a helpful link for you: http://repairpal.com/OBD-II-Code-P0171-and-P0174



You most likely have a vac leak. Hope this helps Fix Ya! Show some love with positive feedback if this brings you to a solution. Thanks Happy Hanna-kwanz-mas

Oct 26, 2010 | 2004 Saab 9-3

1 Answer

Need tofind out code 51 for 1997 jeep grand cherokee 4x4


Code 51 is ( Right Rear Fuel System Lean ) A lean air/fuel mixture has been indicated by an abnormally rich correction factor. Did you get this code by the flashing check engine light?

Sep 04, 2010 | 1997 Jeep Grand Cherokee

1 Answer

Check Engine Light


Your diagnostic about this CODE is:

Generic P-Code DRB Scan Tool Display Brief Description of DTC
P0171 (M) 1/1 Fuel System Lean A lean air/fuel mixture has been indicated by an abnormally rich correction factor.
P0320 (M) No Crank Reference Signal at PCM No reference signal (crankshaft position sensor) detected during engine cranking. P0320 (M) No RPM Signal to PCM (Crankshaft Position Sensor Signal to JTEC) A CKP signal has not been detected at th
For more details, you can visit the obd_dtc_jeep

Good luck, and rated this help.

Aug 11, 2009 | 1997 Jeep Grand Cherokee

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