Question about 2003 GMC Yukon XL

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2003 yukon xl 5.3l flexfuel all plugs lean on passenger side

Check engine light comes on vehicle idles rough.Code reader says po131,po300,po1133. I changed the oxygen sensor on the passenger side no difference thought maybe bad gas. I bought a fuel filter and some spark plugs. When I changed the plugs the driver side plugs were black and the passenger side were white. Could this be the pressure regulator or am I looking in the wrong place? Could this be a vacuum line?

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  • rtripodi Apr 27, 2009

    I have a 2004 Gmc yukon xl po1133 & po0134 service codes , change plugs wires & fuel filter also ran tank of castle fire ball plus fuel treatment. Bank 1 spark plugs black & bank 2 plugs normal , after spark plugs were changed vehicle know runs great ,but engine light keeps coming on for oxygen sensors bank1 S1 & bank2 S2 .

  • Anonymous Mar 17, 2014

    I have replaced the crank shaft position sensor, replaced the spark plugs and replaced the coils and getting a P0300 code multiple misfires. I have also notice that the driver side vents are blowing hot is this indicating that it maybe a vacuum leak somewhere?

  • Anonymous Mar 19, 2014

    Cannot change passenger side rear spark plug

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P0131 - Heated Oxygen Sensor (HO2S) Circuit Low Voltage

P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1


Bank 1 Sensor 1
P0300 - Engine Misfire Detected

I would check for vacuum leaks, maybe intake or brake booster

Posted on Dec 17, 2008

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1 Answer

Code po1133


all the codes you have listed are concerning the exhaust/emissions and random misfire , check all air intake hoses for leaks/wear etc ,check condition of spark plugs renew if in doubt ,take it from there

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There are 2 lighter plugs on my yukon. the one on the drivers side stopped working. The other, on the passenger side still works. Pulled every fuse in interior fuse box by drivers side door. None look...


{: ) There are two fuses that protect the front IP power outlet or lighter plugs. At the underhood fuse block, labeled CIG LTR 15amps and AUX PWR 20amps. See red arrows on diagram below.
The fuse on the driver side door fuse block labeled AUX PWR2 20amps protects the rear lighter plugs.

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Aug 28, 2011 | 2003 GMC Yukon XL

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Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.


A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

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1 Answer

2001 GMC Yukon XL 5.3L - Engine Timing


Doubt it. try a code reader. Sound like an emissions problem

Apr 06, 2010 | 2001 GMC Yukon XL

1 Answer

I have a 2003 gmc yukon 5.3 the engine idles rough sometimes the idle will get so low the engine will shut off.(the engine runs good while driving) hooked to scaner po101 maf/vaf (dont know what vaf is),...


you have a vacume leak somewhere.check all of your vacume hoses for leaks.Injector seals can cause this too.Also intake gaskets could be leaking.Running to lean usually means the car is getting to much air coming in.To check leaks spray brake cleaner around the hoses and the bottom of your intake if the rpms change then you found a leak.

Feb 21, 2010 | 2003 GMC Yukon XL

1 Answer

Error codes appeared on 2003 GMC Yukon PO170 too lean bank 1 PO174 tool lean bank 2 PO300 multiple cylinder misfire Still runs OK, idles a bit rough.


Check the intake manifold gaskets for leakage. It will tend to run rougher in the morning when it is cold. Check for vacuum leaks on any hose connected to the intake plenum too.

Dec 13, 2009 | 2003 GMC Yukon

1 Answer

2003 Yukon, rough idle, extreme power loss,code PO300, miss firing. Changed plugs,wires, and fuel filter with no change.?????


My brother had a similar issue with his Ford F-150, he needed the fuel injectors replaced. Good Luck!

Sep 30, 2009 | 2003 GMC Yukon XL

1 Answer

2001 Tahoe: Hard to start, idles rough, check engine light on.


Flashing check engine light is missfire, fuel pump probably causing multiple tries to start.Having to build fuel preasure,vac leak on one side of intake probably causing rich/lean condition.Also check back preasure to cat ,Sound like you are moving down right track.Mas air flow would probably set lean code bank1 and lean code bank2

Jun 19, 2009 | 2003 GMC Yukon XL

1 Answer

Diagnsis codes


replace your bank 1 (driver's side) position 1 (pre-convertor) O2 sensor. It probably will be completely black, the p0134, 134 and 1133 are all for that O2 sensor, the P0171 is for lean fuel trim on bank 1, and the p0300 is for a misfire probably caused by the lean fuel mixture.

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