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David Rinella Posted on Dec 18, 2018

P0171 check engine light appeared again during long idle.

2010 Volvo S80 T6 Had P0171 check engine light ("lean" condition code). Cleaned MAF sensor, cleared error light, and the light went away for awhile but has now reappeared during a recent long idle.

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Stuart Simpson

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  • Contributor 11 Answers
  • Posted on Dec 26, 2018
Stuart Simpson
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5 Related Answers

Anonymous

  • 8 Answers
  • Posted on Sep 19, 2008

SOURCE: 2000 Volvo S80 T6 scanner code P0237

Actually I believe the code has something to do with fuel.. the P0237 means Powertrain (P), the 0 means its a common code throughout all vehicles not manufactur specific and the 2 means Fuel , the 37 is the specific code and says the problem usually that i dont know off hand but if theres like a lack of power or you know this is creating a misfire i would start out by checkin fuel pressure [pressure, pump, rails] and then fuel delievery [injectors].

hope that gets you started or an idea maybe


ps a turbo is something you usually install yourself so the car shouldnt be equipped with a turbo sensor...i dont think that exists

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Anonymous

  • 659 Answers
  • Posted on Mar 01, 2009

SOURCE: check engine light

this is very common on these. the upper intake seals leak and should be replaced. It is not a noticable vacuum leak and is usually worse when the engine is cold. It is not a very difficult job to do

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Apr 27, 2009

SOURCE: how do I reset engine light

disconnect the battery for 5 minutes or use a scan tool, the scan tool is prefered method.

Ronaldbrains

  • 881 Answers
  • Posted on Nov 02, 2009

SOURCE: volvo 2002 S80 T6 - codes P0011 and P0011

Weell it sounds like you have the days old problem Pepole dont know how to look after there cars.
The muck you still have in the engine isent doing it any good and so you have to get rid of it all, as its in the engine block and is got to go ,,so drain a little of water out and put in 1/2 a cup of washing up liquid in the radiator and start the engine and let it get hot and take the reves up to 1000 rpm now and then to keep the water going around the system, after about 1/4 hr turn off,,stand for 10 minutes ,,and then remove the cap slowly and then take off the Bottom hose and let all water out also take off Top hose at the engine end and put the house water hose in the top and turn it on till all water comes out clean. Then put hose up into the bottom hose and do the same again ,and the same in top again.Now with a clean engine you can do the same to the new Radiator and wash out all gunk .then check the thermostat and make sure its 100% (any doubt through it out) and take note how it comes out so you can fit a new one the same way,
Now refit both hoses and fill with coolant or antifreeze and TURN on the heater to hot before starting as you also have to get out the air from heater when it was drained and you will trap the air which might cause you code problems..
But now try service light reset
1,,Turn Ignition to Number 1position.
2,,Press and hold "day counter"reset button and turn
ignition to II(second) position,hold down for about 12 seconds.
3,,Afterservice light flashes,release button,there should be 2 beeps confirming reset was successful.
Let me know how you get on .. Ron

Anonymous

  • 1 Answer
  • Posted on Dec 25, 2009

SOURCE: Turbo Boost sensor A

my ford f- 350 is doing the same thing, OBDII is telling me its the Turbo Super Boost Sensor A . What the heck is that! I called Ford, they never heard of it!!!!

Anyone can help? Its a 7.3 Liter Diesel 1999 Model Ford F350 Super Duty.

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2001 Dodge ram 1500 4x4 vacuum lines coming off passenger side of plenum . Main vacuum off plenum gos to(check valve or one way valve) then comes to a Ywhere does that line go.

Are you getting a P0171 code too or is it just the P0174? Since you're getting a lean code, if it's not accompanied with a P0171, your MAF sensor may be just fine, especially since you've cleaned it.

Has the fuel filter been changed lately and have you checked fuel pressure to make sure it's within spec? That would be the next thing I'd look at, since low fuel pressure will cause lean conditions.

Is fuel pressure good at idle, under load and is holding after turning off the engine? Another thing to consider...a weak fuel pump can work just fine at idle and low speeds but not pump sufficient fuel volume at higher speeds, causing a lean condition.

I'd move onto checking vacuum lines and intake for leaks if the fuel pump checks out good, then onto testing the 02 sensor at closed loop.
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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

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2004 suzuki verona emissions issue. Check engine light stays on. Shows no error codes, says mixture lean. Can you give a solution?.

A few things to check:
1. A bad intake manifold gasket
2. A missing O ring gasket between the air filter cover & the MAF sensor.
3. A dirty fuel filter.

What's the code? P0171 & P0174 would indicate a vacuum leak. P0171 could be the MAF sensor. Good luck, I'm still fixing all my Verona's annoying "quirks".
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Engine check light on error code 1 is P0171 system too lean bank 1 error code 2 is P0174 system too lean bank 2

P0171 system too lean bank 1
P0174 system too lean bank 2
links to information on the codes

it means that the O2 sensors in your vehicle detected a lean condition in their respective banks. this could be caused by a dirty MAF (mass air flow) sensor or a vacuum leak downstream from the MAF sensor

sometimes you can clean the MAF with electronics cleaner or brake cleaner but be sure to take it off the vehicle first. be careful not to damage the MAF while spraying the cleaner, and allow it to dry completely before installing it on the vehicle.
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My C230 Mercedes has check engine light on. Car checked and the following codes were found: P0171 system too lean, P0300 random/multiple cylinder misfire, P0301, 302, 303, 304- meaning cylinders 1 - 4...

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.
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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.


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Check engine light code P0171 activated on my 2001 toyota corolla

p0171 is lean condition bank one. you could have a vacuum leak a bad map sensor bad maf sensor clogged fuel filter low fuel pressure. start with the vacuum leak first.
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I have a volvo s80 t6 with error codes 171 and 174 it says lean air fuel mixture the engine runs rough sorta like its skipping. What needs to be checked and possible replaced ?

2 things to check air leaks from air box tomanifold where it meets at engine check mass air flow sensor and oxygen sensor start with common sense things first
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