Question about 1997 Jeep Grand Cherokee

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1997 jeep cherokee, check engine light on, diagnostic trouble code says, '' error 51** Fuel System Lean A lean air/fuel mixture has been indicated by an abnormally rich correction factor, which sensor is causing this

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I have 97 model grand cherokee 5,2 and I have a code 51 and check engine is on .which o2 sensor I have to chance downstream or upstream sensor which one must be chance

Posted on Dec 10, 2012

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O2 sensor: or you have stopped up injectors or a vaccum leak or egr valve sticking

Posted on Nov 19, 2009

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What is the code 171 mean on my dodge ram 1500


P0171 Chrysler - Fuel System Lean

Possible causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection

Tech notes
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

When is the code detected?
- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)

Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption


P0171 Chrysler Description
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).




P0171 Chrysler Fuel System 1 1 Lean

Sep 04, 2014 | Cars & Trucks

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

Just had furel system clean, air filter, new spark plugs, coil pack and rear catilyic converter...left the shop went to get inspected...passed inspection runs fine but light came back on...it has 171 code...


Hi Glenn.

If the check engine light is back it means that there is a code stored. The first thing to do would be a code scanning to find out what code is stored. If you are located in US the scan can be done for free at the nearest Autozone. Elsewhere the choice is paying half an hour garage or purchasing an OBDII scanner and doing the checkup at home.

If the code is still P0171, then the ECM (the main computer) is reporting that there is too much air in the air/fuel mixture being injected in cylinders (P0171=lean mixture code-bank 1).

The parts to be checked are those that may result in a lean mixture. Lean mixture can also be reported because of a defective O2 sensor, but if no other code is shown this is not the most common cause for the problem.

Start checking the air sensors in the air intake. Check also the intake itself for leaks. Check also the vacuum system. Vacuum leaks aspire extra air in the engine and may trigger lean codes. There are more problems that may result in the same diagnostic trouble codes, but the two that I mentioned are fairly common. Check if additional codes are displayed. If you still have only lean codes start testing from vacuum and air intake sensors.

Regards.

Ginko

Oct 14, 2011 | 2004 Ford Taurus

1 Answer

P0171 and P0174 Left and Right bank lean trouble codes pulled from ECU. Check Engine Light illuminated.


P0171 = system too lean bank 1
P0174 = system too lean bank 2

The fuel/air mixture is too lean for the entire engine. The fuel pump pressure could be too low. The fuel pump pressure regulator could be at fault. There could be an air leak downstream of the MAF sensor. MAF sensor (hot wire type) could be dirty. Check for intake manifold vacuum leaks. The engine coolant temp sensor and/or the intake air temp sensor could be faulty (stuck at full hot mode).

Feb 26, 2011 | 2008 Hyundai Entourage

1 Answer

I have a code reader and the code is P0171 P0174 System too lean. what makes the system too lean?


P0171 - Fuel Injection System Too Lean Bank 1
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

P0174 - Fuel Injection System Too Lean Bank 2
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

What Causes These Codes: Fuel injection system does not operate properly. The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.) The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light. The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

Jan 16, 2011 | 2000 Ford Explorer

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

OBD test resulted in a "too lean bank 1" diagnostics. How do I adjust the air/fuel mixture on the 97 Tj, 2.5L, multi point fuel injected engine to meet required specs.


There is no fuel mixture to adjust,this is done by the computer,the fuel filter might be the problem,or the injectors are in need of cleaning,use a treatment for the fuel such as luas,this will clean them ,and use less fuel as possible when added,if this does not fix the problem,have the fuel pressure checked the lean burn can be from weak fuel pressure from the fuel pump.

Jun 04, 2010 | 1997 Jeep Tj

2 Answers

Have a code 51 on my 1993 jeep grand cherokee any thoughts on what to look for ( the code is for a lean condition but if i floor it it blows black smoke?)maybe a temp sensor?


P0051 DTC trouble code may be caused by one or more of the following: A short in the heater circuit in the sensor, A failed O2 sensor heater, Wiring/connectors broken/frayed leading to sensor and/or relay, or a failed PCM/ECM Most likely fix is to replace the air/fuel (O2 oxygen) sensor #1 on bank 2 (the side of the engine that doesn't contain cylinder #1).

May 26, 2010 | Jeep Grand Cherokee Cars & Trucks

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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