Question about 2004 Jaguar S Type

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DTC'S ARE PO171 AND ENGINE PERFORMANCE RESTRICTED LIGHT COMES ON.HAVE REPLACED FUEL FILTER.HER VACUUM LEAK AT FRONT OF INTAKE MANIFOLD REPLACED ALL INTAKE MANIFOLD GASKETS AND STILL HERE VACUUM LEAK?

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Jaguar S Type MY 2004:
DTC fault code (EOBD Code): P0171 - Fault location = System too lean, bank 1. (Bank 1 is the right side of the car "V" cylinder block).
Probable cause: Intake / exhaust leak, air system, MAF / VAF sensor, fuel pressure / fuel pump, injector(s), heated oxygen sensor HO2S.

Instructions:
1. Check for air leaks on the intake and exhaust systems. Repair & replace bad pieces if necessary.
2. Check the air system components - harness, connections.
3. Check and replace if necessary MAF / VAF sensor. MAF = Mass Air Flow, VAF = Volume Air Flow, sensor.
4. Check the fuel pressure. Replace the fuel pump and injectors if necessary.
5. Check and replace if necessary the bank 1 heated oxygen sensor HO2S.

Posted on Mar 20, 2011

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I have a 2001 Ford Focus p0 171 code check engine light is on


Hi there:
DTC P0171 - System to lean Bank 1

You might just have an air or a vacuum leak causing this code. This is pretty common. Be sure to check for vacuum leak such as hoses/lines leaking vacuum, intake manifold gaskets as well as the pcv hose behind the throttle body. I would check the PCV line from the passenger valve cover to the rear of the intake manifold. That line will collapse over time due to oil and age. It will create a vacuum leak. With the engine at idle, move the vacuum and PCV line and see if the idle changes and listen for a vacuum swushing sound. Both 02 sensors will not cause both of these codes.

Hope this helps.

Apr 09, 2013 | Cars & Trucks

1 Answer

P0171 AND P0174B WHAT DOES IT MEAN?


Trouble Code: P0171

Fuel Trim System Lean (Bank 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.Trouble Code: P0174

Fuel Trim System Lean (Bank 2)

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.

Oct 24, 2012 | 1999 Chevrolet Express

1 Answer

Po171 po174 restricted performance


Common fault is leaking gasket on intake manifold towards the back, do you have the following symptoms - uneven idle - sudden cut out on idle but starts up again with no problem?
If so you will find a leak on the inlet manifold. The codes show a leak after the MAF- so this is the area to check. Hope this helps.

May 29, 2012 | 2003 Jaguar S-Type

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

Rough ide while in drive: code PO171 and PO442 action taken: put in iridium plugs 60,000 miles ago, recently cleaned throttle body, use bottle of fuel injector cleaner, used bottle of Heet in case...


easy fix..o.k. a P0171 is a lean engine dtc..witch means wrong air fuel mixture..ideal is 14.1 yours is lean...witch means more air than fuel..check to see if there is a intake manifold leak..or vacuum leak.spray small amount of carb cleaner around intake manifold gaskets and see if engine smooths out if it does its a gasket also check for vacuum leaks around air filter rubber snorkle.and all vacuum leaks...if these check out ok...replace the 1st 02 sensor it also controls air and fuel and will cause this issue....as far as a P0442 thats your fuel evap system witch is un related to the first code make shure your fuel cap is tight and sealed...if so replace the evap vent control valve on the canister in the rear by the fuel tank..

Apr 19, 2011 | 2003 Toyota Matrix

3 Answers

2001 ford focus had the spark plugs and wire change. Has a code po171.. ran good for two days. The spark plugs are blacker than acs of spades which is running rich. Don't know what to do next. To me its...


PO171-System to Lean (Bank 1)

Air filter cover tight?
All intake ducting tight?
Clean MAF Sensor.--CRC MAF Cleaner
Fuel Pressure Regulator?
EVAP Purge Valve-stuck open?
Vacuum leaks?
EGR System-issues?

Seems your getting a lean O2 Code,because it is trying to correct for a rich condition,as you said.

Is the Throttle Position Sensor-original?

Work on what is driving it rich,my list is a possible.

May 19, 2010 | 2001 Ford Focus

1 Answer

I have replaced all 4 ox senors before I replaced intake man. gaskets. It is a 97 chevy W/Truck with a V6 auto, auto trans. 2WD. now service engine soon light came on after about 200 miles, it will go off...


First did you clear all the fault codes after your repairs? The reason I ask is po131 is bank one oxygen sensor, po174 is engine lean from faulty oxygen sensor, and po171 is engine lean condition, possibly from vacuum leak (intake manifold gasket?), pcv valve,etc. To check for vacuum leak at intake, start engine and gently spray starting fluid around intake gasket. If rpm raise slightly while doing this then there is a vacuum leak(stay away from air filter intake and housing though), and the gasket will need to be replaced again.

Jan 09, 2010 | 1997 Chevrolet C1500

2 Answers

PO171 error code System too lean bank 1


Here are some possible causes, I would start with anything related to replacing the intake.

Air leaks in intake manifold, exhaust pipes or exhaust manifold
Fuel control sensor is out of calibration
Low fuel pressure (fuel filter clogged, pressure regulator failure)
One or more injectors restricted or pressure regulator has failed
O2 sensors contaminated, deteriorated or has failed
Vacuum hose is disconnected, broken, leaking or loose

Jan 28, 2009 | 2000 Oldsmobile Silhouette

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