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DTC CODE PO171 SHOWING SYSTEM TOO LEAN (BANK1)(2) WHAT DO YOU THINK CAN CAUSE THIS?

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Poss o2sensor

Posted on Jul 13, 2009

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Posted on Jan 02, 2017

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What are the probable causes of DTCs P0400, P0171, P0174 y P0302?


DTC code PO400 could be caused by a clogged EGR valve or EGR tube. try cleaning the EGR valve, tube
DTC code PO171 is fuel system too lean bank 1
DTC code PO174 is fuel system too lean Bank 2
Most likely suspects are O2 sensors, But can be caused by vacuum leaks and also can be Mass airflow sensor (MAF) try cleaning with electrical parts cleaner
DTC code PO 302 is a misfire at cylinder # 2
Check spark plugs and wires
Try cleaning the EGR Valve first along with changing the spark plug first, and see if any codes erase, in other words start with the cheaper fixes first, as some problems can be causing the other other codes

Sep 18, 2015 | Cars & Trucks

1 Answer

Code po171


DTC P0171: Bank 1 system too lean. Probable cause:
1. Wire harness fault. Check for correct voltage, open, short to ground, short to voltage
2. Fuel pressure problem. Check pump, regulator filter, and lines
3. Exhaust laeaks or restrictions
4. Vacuum leaks, dmaged hoses or incorrect routing
5. Fuel contamination
6. Incorrect sensor installation.

Jul 24, 2014 | Ford Expedition Cars & Trucks

1 Answer

Code po171 system too leen bank 1


DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC (Diagnostic Trouble Code) is very similar to P0174, and in fact your vehicle may show both codes at the same time.

I would suggest that you take a look at the front oxygen sensor. Typically speaking the oxygen sensor causes this code to appear. Here is the possible cause list from the manual for your car.

Trouble Code: P0171 - Fuel System Lean (Bank 1)

Possible Causes:
Air leaks in intake manifold, exhaust pipes or exhaust manifold
Base engine mechanical problem causing a lean A/F condition
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
Fuel delivery component fault (clogged filter, low fuel pressure)
O2 element is contaminated, deteriorated or it has failed
Vacuum hose is disconnected, broken, leaking or loose

Hope this helps (remember to rating this answer ans leave us a testimonial comment). Thank you for using FixYa.

Oct 12, 2011 | 2000 Ford F150 Flareside SuperCab

1 Answer

2003 Chrysler Town & Country po171 code


DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC (Diagnostic Trouble Code) is very similar to P0174, and in fact your vehicle may show both codes at the same time.

I would suggest that you take a look at the front oxygen sensor. Typically speaking the oxygen sensor causes this code to appear. Here is the possible cause list from the manual for your car.

Trouble Code: P0171 (2.5L V6 Auto) - Fuel System Lean (Bank 1)

Possible Causes:
Air leaks in intake manifold, exhaust pipes or exhaust manifold
Base engine mechanical problem causing a lean A/F condition
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
Fuel delivery component fault (clogged filter, low fuel pressure)
O2 element is contaminated, deteriorated or it has failed
Vacuum hose is disconnected, broken, leaking or loose

Hope this helps (remember to rating this answer ans leave us a testimonial comment). Thank you for using FixYa.

Oct 12, 2011 | 2001 Chrysler Town & Country

1 Answer

2005 lincoln aviator codes po171 po174 p2195 p2197


This DTC is a very common issue on the V6 and refer at the little rubber elbow on the PVC wears through.

P0171 - System Too Lean (Bank 1)

P0174
- System Too Lean (Bank 2).

Those lean codes are for a lean fuel condition. The first thing I would check is for a vacuum leak. Especially look around the PCV system. Look for soft or collapsed hoses in the PCV system, (especially the rubber elbows) these are very common issue for failure and cause of lean codes. Also check around the intake manifold for leaks or any other hoses that may have come off.

Next I would check fuel pressure and the fuel filter for blockage. If the filter is old you might as well replace it. If and when you find an issue you will have to have a scan tool to reset the check engine light before you go back through emissions.

Check that stuff and let us know what you find.

Sep 30, 2011 | 2005 Lincoln Aviator

1 Answer

Generic code PO171 system 2 lean bank 1 generic


This can be caused by a faulty mass air flow sensor

Jul 06, 2010 | 1999 Ford Taurus

2 Answers

HAVE A 99 GRAND PRIX WITH CODE P0171 SYSTEM LEAN-BANK 1. I REPLACED THE OXYGEN SENSOR ON THE REAR MANIFOLD THAT IS CHANGEABLE FROM TOPSIDE. LIGHT/CODE IS STILL COMING ON AND SHUTTING OFF BY ITSELF. CAR HAS...


po171 is a lean code, and could be likely caused by a plugged fuel filter, or a weak fuel pump, I would recommend changing the fuel filter first since its cheaper.. The filter is located under the rear of the vehicle by the fuel tank, if this doesn't help run, or have run a fuel pressure check to determine if that is the cause. Also look carefully under the hood for any hoses or lines disconnected causing a vacuum leak, this can also cause a lean code

Jan 09, 2010 | 1997 Pontiac Grand Prix

1 Answer

The code po171 bank one to lean for toyota corala 2005


check for a vaccum leak. That is the usual cause for this DTC.

Jan 05, 2010 | 2005 Toyota Corolla

2 Answers

A po171 code came on my scanner i need to know


system too lean in bank 1. clean your mass airflow sensor, replace fuel filter. iff all else fails check you fuel pump.

Nov 06, 2009 | 1998 Ford Contour

2 Answers

What does engine fault code po171 system too lean bank 1 mean thanks


i think its the oxygen sensor (pre cat) in exhaust

Sep 23, 2008 | 2002 Nissan Altima

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