Question about 1998 Oldsmobile Regency
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
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.
Posted on Oct 22, 2009
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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DTC P0171 is a lean code that can be caused by your EGR system, more likely than your O2 sensor.
DTC P2196 - Lack of HO2S-11 Switch, Sensor Indicates Rich
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.
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System Too Lean (Bank 2)
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.
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