Question about 2004 Chevrolet Tahoe

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Diagnostic code reading P0171 and P0174 already changed Mass Airflow Sensor and still getting same codes. What do you suggest next?

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The most common cause for these codes is a vacuum leak and the most common cause for the vacuum leak is the plenum gaskets. With the vehicle cold you should be able to spray carb spray around the area where the plenum bolts to the heads and hear the RPM's change when you hit the leak. If this is the case the plenum gaskets are a fairly easy do it yourself repair.

Posted on Nov 08, 2010

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Code p0171 and p0174


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2004 x-type 3.0 v6 152,000 miles showed codes P0171, P0174, P2096, P2098, P0101, P0171 pd, P1000.


check for vacuum leaks or a faulty mass air flow sensor. all the codes have to do with engine too lean(too much air).

Jun 09, 2012 | Cars & Trucks

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I took my cadillac catera for an emissions test and it failed. They said it failed due to these to codes: P0171 and P0174. What do the codes mean?


Diagnostic Test Code (DTC) P0171 and P0174 are both "LEAN OXYGEN SENSOR" codes. One is for one side of the engine and the other is for the other side of the engine.

To put it simply, you have too much oxygen in your exhaust on BOTH sides of the engine at the same time.
This can be caused by a number of things including vacuum leaks, low fuel pressure, or a bad Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor.
This should be diagnosed using a scan tool that can read fuel trim data so that an effective repair can be made and verified.

Please note that it is HIGHLY UNLIKELY that these codes are being caused by the oxygen sensors themselves.

Please also review this article:
What Else Could Be Wrong?

Aug 25, 2011 | 2001 Cadillac Catera

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Im throwing code p0171 bank 1 system too lean changed plugs fuel filter cleaned maf sensor swapped bank1 and bank 2 upstream 02 sensor to c if code red diff but it didnt and sprayed carb cleaner all over...


Your problem is the mass air flow sensor is bad theat code is miss leading a p0171 and p0174 are both miss leading replace the mass air flow sensor and clear the codes.

May 10, 2011 | GMC Sierra 1500 Cars & Trucks

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SES light on code P0171, 2005 Xterra, what to do??


P0171 is a lean oxygen sensor code for bank 1 on your engine.
It indicates that there is a lean condition (engine not getting enough
fuel or getting too much air) on that side of your engine.
Bank 1 is always the side of the engine where #1 cylinder is
located. In your case it is front-most cylinder on the right side
of the engine. (As viewed from the driver's seat)
So bank one is the passenger side.

If there are any other engine control codes, you need to fix those
first, as they may be the cause of the lean condition.

If that is the only code you are getting, then diagnostic testing
needs to be performed to determine the actual cause of the problem.

Possible causes are:

* Intake air / vacuum leaks
* Faulty / dirty fuel injector(s)
* Incorrect fuel pressure (Likely to cause both P0171 and P0174 at the same time)
* Low fuel volume (Pressure OK) (restricted fuel filter,etc.)
* Fauly Mass Airflow Sensor
* incorrect PCV hose connection
* Exhaust gas leaks
* Faulty Air Fuel Ratio Sensor

Dec 01, 2010 | 2005 Nissan Xterra

1 Answer

I have replaced the port seals, isolater bolts, cleaned the EGR ports, plugs and wires, and chanced the air filter. I was getting both 171 and 174 codes. Now after 60 miles or so, pulled the codes again...


P0171 is a lean fuel condition . The computer reflashed has nothing to do with it . Vacuum leak intake manifold probably . If both P0171 & P0174 were back could be fuel pump low flow or restricted fuel filter . or O2 sensor problem or mass airflow sensor. Suggest you take it to a qualified repair shop to have it diagnosed .
Ford 150 P0171 P0174 Trouble Codes vacuum leak water test

Diagnosing Faulty Mass Air Flow Sensor P0171 P0174 Lean Codes

Aug 10, 2017 | 2000 Ford Windstar

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2000 Ford windstar, 3.8 liter engine. Has fault codes of P0171 and P0174. What do these mean?


p0171 system to lean - bank 1
p0174 system to lean - bank 2
Check for vacum leaks.

Nov 20, 2009 | 2000 Ford Windstar

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Codes P0171, and P0174 bLean on a 98 Navigator. Any ideas?


mass air flow sensor is not the problem, I had the exact same problem and have done much research on this. Check the PVC rubber hoses, especially the elbows for cracks. You probably noticed your gas mileage has been horrible too. Hope this helps

May 28, 2009 | 2003 Lincoln Navigator

2 Answers

4 codes P0171,P0174,P2195,P2197


Hi
171 system too lean
174 system too lean
2195 - 02 ozygen sensor signal stuck lean Bank1 Sensor 1
2197- 02 ozygen sensor signal stuck lean Bank 2
Sensor 1
The 2 front 02 sensors are located on the front of
the exhaust manifold.
Should solve problem and increase gas mileage.

Apr 01, 2009 | 2003 Ford Expedition

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