Question about 2002 Saturn VUE

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Po171 and po174 is this an intake manifold gasket problem

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If its a 6 cylinder it could have loose intake plenum bolts inside the intake causing a internal leak,,,and or a mass air flow sensor,but not a standard intake leak ,there is a tech service bulletin for this at saturn

Posted on Oct 09, 2009

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Possibly, there can be several reasons for that code (LEAN)... a qualified shop will need to ck all the possibilities and recommend repairs.

Posted on Sep 30, 2009

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1 Answer

Po171 po174 restricted performance


Common fault is leaking gasket on intake manifold towards the back, do you have the following symptoms - uneven idle - sudden cut out on idle but starts up again with no problem?
If so you will find a leak on the inlet manifold. The codes show a leak after the MAF- so this is the area to check. Hope this helps.

May 29, 2012 | 2003 Jaguar S-Type

1 Answer

Im having a p1133 po171 po300 po175 on gmc envoy 5.3L what could be the problem


Intake manifold gasket leaking.Replace the intake manifold gaskets.

Jan 21, 2012 | 2003 GMC Envoy

1 Answer

How do I troubleshoot service engine codes for 2002 Ford F-150: PO174 and PO171?


This is the engine lean code. Too much air is entering the engine. Intake manifold gaskets can leak, vacuum lines get old and crack. Check the operation of the EGR and PVC valves, In short it is not easy to find the problem.

Sep 30, 2010 | 2002 Ford F150 Regular Cab

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

I have replaced all 4 ox senors before I replaced intake man. gaskets. It is a 97 chevy W/Truck with a V6 auto, auto trans. 2WD. now service engine soon light came on after about 200 miles, it will go off...


First did you clear all the fault codes after your repairs? The reason I ask is po131 is bank one oxygen sensor, po174 is engine lean from faulty oxygen sensor, and po171 is engine lean condition, possibly from vacuum leak (intake manifold gasket?), pcv valve,etc. To check for vacuum leak at intake, start engine and gently spray starting fluid around intake gasket. If rpm raise slightly while doing this then there is a vacuum leak(stay away from air filter intake and housing though), and the gasket will need to be replaced again.

Jan 09, 2010 | 1997 Chevrolet C1500

1 Answer

Fault codes, PO300, PO171 and PO174


The Po300 is a random misfire code where the PCM is picking up the misfires. The other two codes are lean mixture codes. More than likely these are due to bad intake manifold gaskets allowing unmetered air to enter the engine causing the engine to lean out and possibly run a little rough when cold.

Nov 07, 2009 | 1999 Ford Explorer

1 Answer

Ford 250 trouble code


LEAN CODES, CHECK FOR A VACUUM LEAK AT THE INTAKE MANIFOLD GASKETS, USE A CAN OF CARB SPRAY, WHEN U HIT A LEAK THE ENG WILL CHANGE TONE AND RPM.

Jun 24, 2009 | 1991 Ford Ranger Supercab

1 Answer

1996 ranger 4.0 codes po171 and po174 come up on the screen


Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.

Apr 12, 2009 | 1996 Ford Ranger SuperCab

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