Question about 2001 Ford Explorer Sport Trac

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Banks 1and2 lean have already replaced mass air flow

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You probably have a vacuum leak somewhere along the PCV hose. The rubber elbows on these hose lines rotted from the oil vapor and split. Carefully inspect all the lines, even under the intake plenum. This problem was so common I can pratically guarantee this is what is wrong. You can use a can of aerosol carb cleaner to spray at areas that are hard to see or reach and if it causes a change in idle speed it will help to pin point the location of the leak.

Posted on Jan 02, 2011

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Where is the mass air flow sensor on a 04 grand am se


You said in your comment above:
"bank one is lean would that be the air flow sensor or an 02 sensor?"

Obviously you have the V6 engine and if bank one is lean and bank 2 is running correctly then it cannot possibly be due to the MAF. The MAF monitors air flow to the entire intake and cannot cause a lean condition isolated to one bank - just 3 of 6 cylinders.

It is unlikely to be an 02 sensor either and that can easily be tested for bank one. In fact it will be the oxygen sensor on bank one that is detecting the lean condition.

I would want a decent scan done on the engine and I would have a good look at the fuel trim readings, oxygen sensor data among others to see what irregularities are going on with bank one. I would also want to check that there were in fact NO issues with bank 2 which has not triggered the same lean fault apparently.

In your case, if only bank one has the lean condition I would suspect there is a vacuum leak only affecting bank one causing the lean condition but that will not be proven until more information is available.

Or you can just replace parts without identifying the true problem and hope for the best which I would not recommend.

Jan 09, 2016 | Cars & Trucks

2 Answers

Check engine light on; engine codes P0171 and P0174


p0171 is lean exhaust bank one ( passenger side) and p0174 is lean exhaust bank 2 ( drivers side). First we need to look for vacuum leaks, low fuel pressure, Intake air leaks after the mass air flow sensor, pvc system. Because you have both sides lean I would start looking at these spots.

May 23, 2011 | 1998 Ford F150 Regular Cab

2 Answers

What does error code p0172 and p0174?


P0172 - Fuel Injection System Too Rich Bank 1 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connec
Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.



P0174 - Fuel Injection System Too Lean Bank 2 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection
Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem. Bottom line possible defective Mass airflow sensor and or O2 sensor in cylinder bank number two.

Feb 21, 2011 | 1998 Ford Expedition

1 Answer

What cause the bank1 and 2 too lean


P0174 - Fuel Injection System Too Lean Bank 2 Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem. P0171 - Fuel Injection System Too Lean Bank 1 Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.

Jan 11, 2011 | 1998 Chevrolet S-10 Pickup

1 Answer

I have a 2001 yukon denali and im getting these trouble codes(p0171bx2, p0102b, p0174b) and i dont know where to find out what they are. Also it read im lean in bank 1 & 2


po 0102 is mas air flow sensor maf/vaf
p0171 bank 1 too lean
p0174b bank 2 too lean
What you have here is either a defective mass air flow sensor and or a possible broken loose or rotted vacuumn line or hose creating this havov, with the engine warm and idling in Park tap the air flow sensor in its housing and see if the engine gets upset(rough) if so replace the sensor its expensive.
If ok have the vac system checked for possible leaks in the hoses at around the intake manifold gasket area etc, fix and replace as needed.

Nov 05, 2010 | 2001 GMC Yukon Denali

2 Answers

1999 gmc yukon obd11 codes po101 po171 po174 po429 what could be the causes


ok heres problem 101 is mass air flow sensor 171 running too rich 174 running too lean can find 429 but it the same lines i believe take out your mass air flow sensor and clean it check it connection if comes back on replace the mass air flow sensor

Sep 24, 2010 | GMC Yukon Cars & Trucks

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

1 Answer

SYSTEM TOO LEAN BANK 1&2


this means all cylenders are lean possably an air leak check all the air intake not sucking air after the mass air sensor my have a bad mass air flow sensor

Dec 31, 2009 | 2000 Ford Taurus

2 Answers

Service engine soon code p0174


PO174= system too lean Bank 2. Good chance oxygen sensor acting up, may need replacement. If it's 4.6L, that's driver side of engine.

Dec 22, 2009 | 1999 Ford Expedition

2 Answers

Code 171 and engine light is on


--BANK 1 = DTCs P0171 (lean) and P0172 (rich)

-Check intake air system for leaks, obstructions and damage.
-Check air cleaner element, air cleaner housing for blockage.
-Verify integrity of the PCV system.
-Check for vacuum leaks.

I would try cleaning the Mass Airflow Sensor first. A dirty Mass Airflow Sensor is a common problem for triggering PO 171 & 174 codes.

Good luck and keep me posted.

Oct 21, 2009 | Chevrolet Colorado Cars & Trucks

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