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Im getting P0171 code- lean .

LOng term fuel trims at 30 + . Tank pump psi ok- 55-60.

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    obd ii - 'Check Engine' code P0171 System Too Lean - Is it ...

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    Feb 11, 2014 - 'Check Engine' code P0171 System Too Lean - Is it safe to drive? ... My question is: is it okay to drive my car while it shows these codes? ... This will cause you to get increasingly worse fuel mileage. ... I am going to defer to your expertise, but I just want to ask if you've considered that lean-running engines ...

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    Definition of error code P0171 and P0174 - System too Lean (Bank 1 and Bank 2). ...Before we get into the main causes of P0171, let's explore why this code matters. ..."Lean" running cars and light trucks are highly polluting vehicles. Most of ...

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    Question Product: Cars & Trucks Question Details: Mazda tribute codes p0171 ... I am getting the following (4) codes in a 2003 Mazda Protege5 engine: P0090 ...

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Posted on Jan 27, 2016

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3 Answers

2005 2.2 eco tech threw a P0171 code. Smoked the motor and found no vacuum leak. Engine raises and lowers RPM's at around 3800 RPM's Fuel pump puts out 50 psi at idle and lowers to 48 when given gas.


Did you view sensor data parameters on a professional type scan tool ? What are the fuel trim's at ? long term & short term , Are the O2 sensors switching normally , MAP sensor data etc.... What kind of vehicle are we talking about ? The fuel pressure droping a couple PSI doesn't mean the fuel pump is bad . Suggest you take it to a qualified repair shop.

Jun 21, 2018 | Cars & Trucks

1 Answer

06 Cadillac STS V8 car has codes P0174 and P0420.


• DTC P0171 Fuel Trim System Lean Bank 1
• DTC P0174 Fuel Trim System Lean Bank 2
.
The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the ECM determines fuel delivery based on sensor signals without oxygen sensor (O2S) input. During Closed Loop, the O2S inputs are added and used by the ECM to calculate short and long term fuel trim (FT) fuel delivery adjustments. If the O2S indicates a lean condition, FT values will be above 0 percent. If the O2S indicate a rich condition, FT values will be below 0 percent. Short term FT values change rapidly in response to the heated oxygen sensor (HO2S) voltage signals. Long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. If the ECM detects an excessively lean condition, DTC P0171 or P0174 sets.
Diagnostic Aids
• Excessive resistance in the fuel injector ignition 1 voltage circuit or the fuel injector control circuit may cause the following symptoms:
- Lean condition
- Misfire
- Rough idle
• The system will go lean if an injector is not suppling enough fuel.
• A lean condition could be present during high fuel demand.
• A malfunctioning MAF sensor can cause this DTC to set. Refer to DTC P0101 .
• Review the Failure Records with a scan. If an intermittent condition is suspected, refer to Intermittent Conditions .

DTC Descriptors
This diagnostic procedure supports the following DTCs:
• DTC P0420 Catalyst System Low Efficiency Bank 1
• DTC P0430 Catalyst System Low Efficiency Bank 2

This code could mean the catalytic converter on that bank has failed .

Causes of lean condition trouble codes P0171 P0174 GM 5 3L

P0420 P0430 catalytic converter catalyst inefficiency code diagnosis

Mar 28, 2018 | 2006 Cadillac STS

2 Answers

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

Engine Code P0171 Logged


If Short term # is high while underway, but normal while idling, you could have a scewed maf signal. Sometimes cleaning maf with carb cleaner helps. If no intake leaks are found, and fuel pressure and volume are ok, it could be maf sensor.

Jan 18, 2016 | 2007 Toyota Hi-Ace 220

1 Answer

Recently purchased. MIL light on - Scan tool Shows code P0171 $07E8 Monitor / GenericLean Trim.


First of all, what kind of car is this? Second, this is a lean code. Now, if you really have no intake leaks or restricted fuel issues, one possibility is scewed maf signal during higher rpms. If you can, monitor your Short Term fuel trim at normal highway speeds.If it is high, then and lower at idle, you may need a maf sensor.
Hope this helps

Jan 18, 2016 | Cars & Trucks

1 Answer

1996 GMC Suburban w/350 surges at idle


Check engine light on ? Lean codes , fuel trims ? Causes of lean condition trouble codes P0171 P0174 GM 5 3L

Do you know what a professional type scan tool is ? What fuel trims are . How to find a lean condition ? Understanding Short Term and Long Term Fuel Trim an SD Premium video

Mar 29, 2017 | 1996 GMC Suburban

1 Answer

Chek ingen code p0171


Trouble code P0171 means: Fuel System Lean (Bank 1)

The "lean condition" code is set when the long-term fuel trim value reaches a certain setpoint, +14% if I remember right. Whatever is going on, the PCM thinks the car is running lean. It could be a faulty O2 sensor (or the wiring), a fault in one of the other sensors that are used for the fuel trim calculations (IAT, MAP, TPS, coolant temp, battery temp, rpm, or any of the wiring associated with those), or an actual lean condition caused by a problem with one of the fuel delivery devices (fuel pump, fuel filter, fuel pressure regulator, fuel injector, or any of the wiring or tubing associated).

Jun 11, 2011 | 1997 Dodge Neon

1 Answer

Speedometer sudenly stoppped working. now works intermittently. also shows check engine light. It is showing p0171 & p0172 codes. Lean and rich. seams like they contradict each other. occasionaly the...


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
OBD II P0172 Fuel System Too Rich (Bank 1).P0172 - System Too Rich (Bank 1) Essentially this DTC means that an oxygen sensor in bank 1 detected a rich condition.
When the code says that the Fuel System is "too rich," it means that the computer has been subtracting more and more fuel, which is called Long Term Fuel Trim. Ideally, the Long Term Fuel Trim should be close to 1 to 2 percent. When a code P0172 is set, it means that the Fuel Trim is anywhere from -15 percent to as low as -30 percent compensated. When this happens, the computer knows that there is an improper condition in the control of the Fuel System.


Thanks.

Feb 07, 2010 | 1996 Volvo 850

1 Answer

What does trouble code P0171 for a 2002 Buick Park Avenue mean?


Trouble Code: P0171 (3.8L V6 VIN 1 Auto)
Fuel Trim System Lean (Bank 1) Print this code dataprint_icon_codes.gif Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
DTC P0101-P0103, P0107, P0108, P0121-P0123, P0130-P0138, P0140, P0141, P0201-P0206, P0300, P0401-P0405, P0410, P0440-P0446, P0506, P0507, P1404 or P1441 not set, engine started, vehicle driven at less than 82 mph at 550-4000 rpm, BARO sensor over 70 kPa (10.1 psi), ECT sensor from 68-230ºF, IAT sensor from 64-158ºF, MAF sensor from 2.8-150 gm/s, MAP sensor from 16-105 kPa (2.6-15.2 psi), fuel level over 10%, and the PCM detected the Long Term fuel trim value was more than +20% for 6 seconds. The PCM controls the air/fuel metering system to good overall fuel economy, driveability, and emission control. During open loop, the PCM determines fuel delivery based on sensor signals, without the oxygen sensor input. During closed loop, the PCM adds oxygen sensor inputs to calculate Short and Long term fuel trim fuel delivery adjustments. Short Term fuel trim values change rapidly in response to changes in the oxygen sensor signals. Long Term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1.

Possible Causes:
  • Air leaks in intake manifold, exhaust pipes or exhaust manifold
  • Fuel control sensor is out of calibration (ECT, IAT or MAF)
  • Low fuel pressure (fuel filter clogged, pressure regulator failure)
  • One or more injectors restricted or pressure regulator has failed
  • HO2S element is contaminated, deteriorated or has failed
  • Vacuum hose is disconnected, broken, leaking or loose

Troubleshooting:2002 Buick Park Avenue, 3.8L, P0171

Nov 01, 2009 | 2002 Buick Park Avenue

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