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Dtc p0171 code - 1998 Oldsmobile Regency

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DTC and P0171 or 0174 are telling you that the O2 sensors has detected too much oxygen in the fuel mix on either bank 1 or 2 of the engine.
In you air intake you will find a square port with an electrical plug on it. Remove the intake hose, and plug, as you look inside th MAF it will look like a honey comb. You will see avery fine wire, this is the sensor, DO NOT TOUCH IT , purchase a can of Mass air flow sensor cleaner. Remove the MAF and spray down the sensor. DO NOT TRY TO DRY IT WITH ANYTHING, it will dry quickly. Re-assemble. You may not notice any difference, but when we do this it always seems the vehicle has more power.

Posted on Feb 05, 2010

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Posted on Jan 02, 2017

SOURCE: serging at idle

Pic me pick me, i know this one. I just fixed thjis on my daughter f250 today, very common problem. If you have a K/N filter it prabably got the MAF sensor dirty. Because it is surging I would be more prone to think it is the PCV hose on the vavle cover. It goes up to the Throttle Body. It may be in the back center area. Or it may be right in front. Remove the hose and inspect for holes. If it is leaking you might be able to just wiggle it with the engine running and hear a hiss

Posted on Jul 16, 2009

1fastbob
  • 301 Answers

SOURCE: my 2001 cadillac deville keeps giving me dtc code system to lean

Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.

Bob

Posted on Oct 22, 2009

  • 30 Answers

SOURCE: poor idle dtc P1151, P1131,P0174, P0171. runs ok

Change plugs, and Mass Air Flow sensor. This should do the trick

Posted on Nov 30, 2009

ZJLimited
  • 17970 Answers

SOURCE: engine light coming on. Code reader says "too

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 is very similar to P0174, and in fact your vehicle may show both codes at the same time.

Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

Causes: A code P0171 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak downstream of the MAF sensor.

Possible solutions include::
* In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect all vacuum and PCV hoses, replace if necessary
* Check for a dirty fuel filter and proper fuel pressure


Hope helps (remember to rate this).

Posted on Nov 09, 2010

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Vehicle CEL is on, various codes


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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
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1 Answer

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code p0171 refers to system too lean bank 1===causes ---intake /exhaust leak---AIR system--MAF/VAF sensor---fuel pressure /pump---injector/s ---HO2S sensor
if it runs ok then replace the HO2S sensor in bank 1 (exhaust before the cat converter at the firewall side of the engine)

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A 2002 2.5L Buick, mileage 138000km. Engine fault light, DTC code P0171 what is matter?


According to the experience in the repair, fault code P0171 is used in the fuel system, such as a fuel injector or fuel filter clogging, fuel pressure problems.
The fuel adjustment values measured by GM TECH2, Fault code P0171 is Buick car of a multiple fault. Fault car most can be cleaned by the injector, replacing the fuel filter troubleshooting, also have individual vehicle is to solve the problem by replacing the air flow meter.

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1 Answer

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Hi there:

DTC P0171 is a lean code that can be caused by your EGR system, more likely than your O2 sensor.


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A HEGO sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

Hope helps.

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1 Answer

Ford windstar check engine light comes on after stopping when starting to get moving again shows p0171 & p0174 codes why??


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks. P0174 OBD-II Trouble Code


Technical Description

System Too Lean (Bank 2)


What does that mean?

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

-----------

Thanks.


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