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CODE P0171 KEEPS ON COMING BACK ON,REPLACE O2 AND MAP

CODE P0171,KEEPS COMING BACK ON.REPLACE O2 AND MAP
SENSORS.

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Hi Jonah,

I have the same problem and it only propped up after i had my exhaust manifold repaired, do you think the mechanic didnt do the weld it right?

James
2001 Saturn L200

Posted on Sep 03, 2012

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P0171 is the data trouble code for (fuel trim system lean bank one) A vacuum leak around the intake manifold gasket on bank one (bank one is the cylinder bank that has the #1 spark plug), or a bad fuel injector seal on bank one could cause that code, but I have seen that code set many times before just because of a dirty MAF (mass air flow sensor/meter), try cleaning the MAF and see if that cures the problem. Let me know if you need any further assistance cleaning your MAF.

Posted on Apr 27, 2010

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CODE PO171- FUEL INJECTION SYSTEM TOO LEAN.POSSIBLE CAUSES - AIR LEAKS IN INTAKE MANIFOLD - EXHAUST PIPES OR EXHAUST MANIFOLD .DIRTY STOPPED UP FUEL INJECTORS.STOP UP FUEL FILTER AND FAULTY FUEL PRESSURE REGULATOR OR WEAK FUEL PUMP.

Posted on Apr 27, 2010

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Posted on Jan 02, 2017

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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

Symptons o2 sensors


If your O2 sensors are malfunctioning, the main symptom would be that the Check Engine light will come on. On some vehicles, an O2 sensor circuit shorted to ground can cause a no-start problem.
If the "Check Engine" or "Service Engine Soon" light is on and there is a code for the O2 sensors, I would like to also advise you that many O2 sensor codes are not caused by the O2 sensors themselves. In many cases, the O2 sensors are only REPORTING the problem. for example, a code P0171 "Oxygen Sensor Lean" code is rarely ever caused by the O2 sensor. It is usually caused by a vacuum leak or a failed Mass Airflow sensor (MAF) or Manifold Absolute Pressure sensor (MAP) or a bad fuel injector. In these cases, repairing the real reason that the engine is running lean will fix the O2 Sensor code without replacing the O2 sensor.

Mar 12, 2011 | 2000 Chevrolet 3500

1 Answer

I have five codes P2237 P2196 P2271 P0030 P0171 and a P2237 pending code on a 2005 elantra.The car runs poorly, bad gas mileage, sluggish with the check engine light on.Are all O2 sensors bad or maybe the...


P2237 P2196 P2271 P0030 P0171

These are all O2 sensor trouble codes, except P0171 which is a fuel trim code,

You have a bad 02 sensor - up stream - Bank 1 Sensor 1.

Replace it, then road test. The engine computer has a 'default' fuel trim it uses when an O2 sensor fails so it can protect the catalytic converter. If this hasn't been going on too long, good chance simply replacing the O2 sensor will remedy your problem.

Feb 06, 2011 | Hyundai Elantra Cars & Trucks

1 Answer

Engine lugs and misses several codes P0171 ,P0305,Po430,P0305


your code point to your truck is running lean
your codes report that the o2 sensors are sending this code
this does not mean that your o2 is bad
i would look to your MAP sensor and also check your vacuum to the MAP
you may get buy just cleaning it with brake cleaner
but make sure it is dry before you put it back in
if that don't work i would replace the MAP
tell me how you make out

Jan 22, 2011 | 2006 Ford F-150

2 Answers

Service recommendation code p0171 p174 sytem too


2001 Buick LeSabre 3.8L V6 Check Engine Light come on after driving in 20 minutes,error code P0171.....O2 sensors and fuel filter changed ,how can I pinpoint the source.

Feb 09, 2010 | 2001 Hyundai Santa Fe

2 Answers

Oil CAP Not placed after Oil Change by CARx Engn Light on P0171


Well an engine vacuum leak can cause the P0171 code to come on and having an oil cap missing is a vacuum leak. The first response for this code is to replace the O2 sensor because that is what the code is for...bad O2 sensor reading. Now too much air from a vacuum leak can cause a lean condition in the exhaust. If they are going to replace the O2 sensor for free then let them..If you trust them to replace it. It is possible that the lean condition could have damaged the O2 sensor. You may find that after a few days of driving with the cap back on the check engine light might go back off. I do not think anaything would be permanently damaged as long as the oil level did not get too low and nothing got into the engine thru the open hole in the valve cover. Does the car seem to be running ok? No overheating, miss, ect.

Nov 25, 2009 | 1998 Toyota Camry

2 Answers

Have p0130 and p0133 codes 98 toyota tacoma


check the mass air flow sensor there maybe dirt on the filiment inside the sensor causing false readings. cleaning or replacing it may make the codes go away.

Oct 28, 2009 | 1998 Toyota Tacoma

3 Answers

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...


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

Sep 24, 2009 | 2001 Ford Escort ZX2

2 Answers

I have a P0171 to lean bank 1 error code Upstream O2 sensor?


oxygen sensor, vacuum leak, and yes it could most definitly be if you swaped the wires of the firing order accidently you will get a code p0171 Check the tubing going from the air filter to the intake manifold to see if it has come loose. This might account for extra air going into the intake manifold than the computer is aware of. Otherwise it may be due to a faulty(or dirty) MAP/MAF sensor. Another possible cause is from low fuel pressure due to restricted fuel lines or a bad fuel pump.

Jul 28, 2009 | 1999 Chevrolet Cavalier

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