Question about 1997 Ford Explorer AWD

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P0174 error change bank1 and 2 oxgen sensor, after driving 20 to 30 miles my engine light comes back on.

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  • yadayada
    yadayada May 11, 2010

    check for vacuum leaks, check for a cracked egr supply tube from the exhaust manifold tube.

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Had same problem on ford escort turned out to be a vacuum leak in pvc hose.

Posted on Jan 21, 2009

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Chevy Silverado error p1151


P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2


p1131 p1151 p0171 p0174 p1131 p1151 p0171 p0174
All of these p1131 p1151 p0171 p0174 codes indicate a problem with a lean condition. This engine is known for vacuum leaks, so before you start throwing oxygen sensors at the problem, it pays to perform some diagnostics.
Start by cleaning the MAF sensor. Spray the sensor with CRC MAF sensor cleaner. Next, check the plastic vacuum lines, especially where they meet with rubber boots. If they are cracked or the rubber is swollen, replace the line. Then check the rubber elbow that holds the PCV valve. That elbow is a know failure point. In fact, the entire PCV tubing is a trouble spot on these engines. (thanks Ford).
After you've checked for vacuum leaks, check the operation of the oxygen sensors. The easiest way to do that is to disconnect the sensor from the harness. Connect one lead of your digital voltmeter to the black wire on the sensor and the other lead to battery negative. Then start the engine and add fuel (either propane, starting fluid, or carb cleaner) into the throttle body to force the mixture to rich. You should see a corresponding increase in voltage as you add fuel (from 0 volts to slightly less than 1 volt). Start and stop the fuel enrichment and watch the meter to see if the volts drop as you stop adding fuel. If you see no change, the sensor is dead. Replace it.
You can also use the fuel enrichment procedure to locate intake gasket leaks.
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P1151P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2
P0174 system lean bank 2
P0171 system lean bank 1


This is the only info that didn't come back directly to FORD (yet still mentions it) instead of GM. Not to sure you got the correct code.

Jul 08, 2014 | 1999 Chevrolet Silverado 1500

3 Answers

P0171 and p0174 codes in memory. I had a tune up and a 4th or 5th cylinder wa not firing. The tune up included new plugs and wires and a new coil for one of those cylinders..I drove over a hundred miles...


THIS IS WHAT THE CALL TRHOTTLE POSITION SENSOR WICH IS LOCATE ON THE SIDE OF THE THROTTLE BODY THIS PS CONTROL THE IDLE ALSO CONTROL OR MIX THE OXYGEN WITH THE GAS

Jan 04, 2011 | 2003 GMC Yukon XL

1 Answer

2000 E-350 V-10. P0174 with exhaust fix


Before I even finished reading this i knew you had a clogged cat. If you have fixed everything you mentioned i would lean towards a clogged cat. This is a large reason this code pops up.

To check this you could pull that cat out and drive around and see if the code comes back, make sure to stay away from the police though.

Subikid90

Mar 03, 2010 | 2000 Ford Econoline

1 Answer

2002 Jeep Liberty P0174 code and mech has changed the o2 sensor


Can't tell you exactly what is wrong but the one thing you said is of concern...Map sensor should not be full of oil. If it is, I'd want to know why. In finding the reason for that, you may also find the reason why you are having a problem.
Jeep uses two kinds of engine crank venting. you either have a pcv valve or an orifice controlled system. If either are obstructed it can overpressure the crankcase and cause all kinds of problems.
Years of experience tells me this isn't something I can guess at and be 100% sure I have the right answer but based on what you said, I'd look there first!

Feb 07, 2010 | 2002 Jeep Liberty

1 Answer

Oil light comes on and beeps


Changing oil can't hurt. When was the last time you had it changes?How many miles on that engine?Changing approximately ever 3,000 miles is common practice. The engine oil light and the automatic transmission are two seperate problems.     Engine oil light come on because the sensor reads a low oil preasure.If the engine is not worn then the light can be caused by the sensor getting cloged up (from dirty oil ) and not reading the preasure correctly.  

Jan 04, 2009 | 1996 Volkswagen Jetta

5 Answers

Code #P0171 & code #P0174


Look, man here is the deal:
code p0174 - refer to the front cylinder bank
code p0171 - refer to the rear cylinder bank

Jun 22, 2008 | 2002 Ford Explorer Sport

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