Question about 1998 Mercury Mystique

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My mercury mystique is running lean check engine light is on code comes back running lean maybe a vacum leak where do I look

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Intake manifold, all the hoses, check for cracks, collapsed, disconnected.

Posted on Jan 14, 2010

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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

1 Answer

What does code P0171/P0174 mean


Banks 1 and 2 are lean. Could be mass air sensor. Fuel filter dirty injectors . Vacume leak. Or computer needs updated

May 27, 2014 | 2005 Mercury Mariner

1 Answer

Mercury mistake


Exhaust leaks can throw off the oxygen sensors, which affect engine fuel and timing. Moving out of park could be a problem with the shift linkage. Start by checking your transmission fluid level and color. Get the codes read and start fixing whatever is causing the check engine. Most states car inspections will fail a car with the check engine light on so you need to cleanup the problems before your next inspection.

Mar 02, 2014 | Mercury Mystique Cars & Trucks

1 Answer

Tried getting ford f150 4.2 2003 inspected. Replaced air filter and fuel filter already. Check engine lit was on before replacing them . Now check engine light is out . But won't pass inspection.


As for your codes p1131 and 1151: Ford - Lack Of Heated Oxygen Sensor Bank 1 Sensor 1 Switches - Sensor Indicates Lean


Last week I had the very same catalyst, evap and ECG codes come up on my 1999 Mercury Mystique which is like a Ford Taurus. A friend was able to find a hole or leak in the hose connected, replaced it and it runs fine. I havent run it a full and straight 50 miles yet to clear the check engine light but that repair alone changed the entire way the car was poorly driving. Im sure that hasnt fixed all the probs but thats a good starting point.

Mar 04, 2013 | 2003 Ford F150 Regular Cab

1 Answer

When i first start my car up it runs a little rough. i have replaced spark plugs, wires, a code code comes up and says it is running lean. after the first start of the day it runs smooth until it sits in...


a code for lean or lean condition typically indicates a vacume leak ,lean refers to too much air or not enough fuel too much air or more air than expected "leans" the fuel mixture, usually a vacume leak or a leak in the air intake system is the problem also i would have the coolant temp sensor checked out

Nov 21, 2010 | 1998 Cadillac DeVille

1 Answer

99 mercury sable automatic trans vehicle idles very low randomly even stalls out sometimes high idle occurs as well reaches about 4000 rpm at times. engine light threw 4 codes, all to do with o2 sensors...


Sounds like a broken or torn vacum hose, pcv valve clogged, or bad Idle air control motor. Did you spray carb cleaner on vacum hoses or near the plastic intake., and did the motor rev up or down? Those codes represent a lean condition which means most like a vacum leak or clogged idle air motor. Sometimes the intake manifolds crack or the intake manifold gaskets crack. FInd that vacum leak or inpect iac motor

Oct 28, 2010 | Mercury Sable Cars & Trucks

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

1 Answer

2001 Ford Explorer Sport running too lean in both banks


any of those sensors can cause that but the best thing to do is scan it or check for a vacuum leak with a smoke machine.

Jul 22, 2009 | 1998 Mercury Mystique

1 Answer

Engine runs rough


bank 2 is on driver side and bank1 on passenger side. you need to check all vacum lines if you have a lean code. in other words check all vacum hoses for leaks.

Jan 31, 2009 | 1998 Mercury Grand Marquis

1 Answer

1996 mercury mystique


Check for vacuum leaks.You can spray starting fluid around all parts of the intake.Observe idle as you do.If there is a leak the engine rpm will race higher.Also listen for hissing noise.Is the check engine light on?..If so what codes are stored..Good Luck!!!

Aug 04, 2008 | 1996 Mercury Mystique

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