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Could a vacume leak cause these codes - S60 Volvo Cars & Trucks

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I have a 2006 gmc envoy,check engine light keeps coming on,the code says it's a vacum leak,my ? is how common is this and where would i start?


What is the code ? No code specifically say's there is a vacuum leak . P0171 - P0174 lean condition ! Could be caused by lack of fuel as well , plugged injectors , fuel filter , low fuel pump pressure etc...
How to Diagnose OBD II Fault Codes P0171 and P0174 Leaking Intake and EGR...

Mar 23, 2017 | GMC Cars & Trucks

2 Answers

2000 chevy silverado p0171 ; p0174; p0300


Sounds like you have a serious vacum leak.; DTC 0174 and 0174 are lean conditions on bank 1 and bank 2, 0300 is random misfire. The only thing I can think of is a big vacum leak like the brake booster / vac line leaking, or maybe the intake manifold is cracked ... even a stuck-open EGR doesn't normally lean a motor that much. Start by checking for a vacum leak, if the motor will idle you can spray a little WD-40 around ports and lines >> if the idle speeds up or becomes smooth you on the right track in the area you judt sprayed.

Feb 26, 2015 | 2000 Chevrolet Silverado

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Why does the mass air flow code comes back after replacing the sensor?


Mass Air Flow sensor just measures incoming air flow at a predetermined rpm/load. The computer is saying the flow measurement is not correct. This can be caused by mechanical faults within the engine like a bad valve seat or timing chain but would generally be accompanied by backfires through the intake. Usually its caused by a vacume leak between the sensor and the intake valve,like the intake manifold,loose intake pipe clamps, broken vacume lines,a leaking vacume brake booster [it will hiss loud when you apply the brake],bad spark plugs/wires, a clogged catalytic converter, stuck open egr valve or pcv valve,bad oxygen sensor or even a very clogged air filter. I know there is a lot listed but the MAF or MAP sensors show general flow through the engine that can be affected by several things. A vacume tester from your local auto parts store is about 30bucks and usually has instructions how to test for vac. leaks within the engine also to determine a if thers is bad valve seat or clogged exhaust.

Aug 24, 2014 | 2002 Chevrolet Monte Carlo

1 Answer

Will catalytic converter cause large vacum leak


yes if its stoped up but in most cases if thats bad the catalytic converter that is than a car will run verybad look at all vacume hoses to se if one is pinched to gether check the pvc valve if its stoped it cancause a vacume leak bad

Nov 12, 2012 | 1999 Dodge Durango

1 Answer

I have a 04 seville sls Im reading 2 codes p0171 & p0174 two different o2 sensors seems odd that 2 sensors go at same time do you have any suggestions ?


those are fuel system lean codes i beleive. Usual cause is a bad or weak fuel pump or most common is a vacum leak causing to much un metered air into the combustion chamber. If there is a vacum leak you will hear it and if you dont goto your local parts store and buy or borrow a fuel pressure tester and check the pressue. Shoud be about 50 psi.

Dec 27, 2010 | 2004 Cadillac Deville

3 Answers

1998 merc. sable I replaced bank 1 sensor 1 oxigen sensor still get code P0135 drove 300 miles to reset mil's code still there (help)


Fords are bad about vacum leaks, check all vacum hoses repair as needed.Vacum leak will give an o2 sensor code.

May 11, 2010 | 1998 Mercury Sable

2 Answers

Runs fine in nuteral at about 1500rpm but as soon as you put it in gear it acts like you are fluttering the acc. pedal


Scan it for codes. Check for vavuum leaks. Make sure all the ducting from the air filter to the throttle body is tight and not leaking air in.

Mar 12, 2010 | 1996 Ford Explorer

1 Answer

2003 maxima engine deisels when turned off/also idles high


you could have a cylinder miss causing the comp to raise idle to try to stop the missfire. it could be a vacume leak or a bad idle air control motor. id check the throttle body for cracks and any vacume leaks at all. if your sure its ok,then an idle air control may be required

Sep 02, 2009 | 2003 Nissan Maxima

1 Answer

My check enging light is on and when I check codes I get lean bank 1 & 2. The truck is a 2000 Ford Ranger with the V6 and auto 2W drive.


chack ALL the vacum lines on the engine.they are notorious for becoming oil soaked and leaking.if you have a vacum leak it will cause the engine to run lean.

Jul 30, 2009 | 2000 Ford Ranger SuperCab

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