Question about 2003 Chevrolet Silverado 1500

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Codes 2003 silverado

Also have a 2003 silverado 4x4 4.8l "v" engine. I currently have 2 codes 171 bank 1 runs too lean & 174 bank 2 runs too lean. my tech says it's the intake manifold? does this make sense?

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  • beowulf69 Feb 03, 2009

    still have codes, (171/174) pcv good, o2 sensors god, mass air sensor cleaned out. tech at dealer is saying intake manifold gasket ng!?? does this make sense or is he trying to pull $900 out of my pocket?????

  • beowulf69 Feb 04, 2009

    we'll go with it for now if it don't work the next job is on the dealer!

  • cj14809
    cj14809 Jan 18, 2012

    i have the same problem with a 2000 silverado i changed maf map purge silinoide fuel regulator pcv valve and o2 bank 1 upstream and bank 2 downstream and still showing to lean

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  • Master
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Spay wd-40 where the intake meets the manifold while the truck is idling and if the idle speeds up there a leak. If it does it will %100 Determine a leak

Posted on Feb 03, 2009

  • Michael Fisher
    Michael Fisher Feb 03, 2009

    In Addition A Gasket Or Crack Will Easily Cause The Vehicle To Run Way To Lean And Will Eventually Cause The Truck To Run Undesirably.


    Also If You Wanna Save Some Money Don't Take It To A Dealer Take It To A Repair Shop. I Quickly Learned That When Trying To Locate Parts And They Wanted %75 More For Any Part Or Service.
    For Example They Wanted $30 For A Wheel Stud And Napa Charged Me $3.00 A Piece I Mean Talk About A No Brainer.


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  • Master
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Means that the O2 sensor has seen a condition of more air in the engine than it can supply fuel (there is only one bank on the zx2).... My guess is the PCV hose is broken ... Not remembering the motor in the zx2 right now hurts me.. but I've seen the break either on the valve cover gasket, or where it enters the intake (it sometimes is hidden underneath)

Posted on Feb 03, 2009

  • rockfixya
    rockfixya Feb 03, 2009

    --BANK 1 = DTCs P0171 (lean) and P0172 (rich)--BANK 2 = DTCs P0174 (lean) and P0175 (rich)

    -Check intake air system for leaks, obstructions and damage.
    -Check air cleaner element, air cleaner housing for blockage.
    -Verify integrity of the PCV system.
    -Check for vacuum leaks.

    Are any of the above concerns present?

    please follow the link below for more info>>

    http://www.automotiveforums.com/vbulleti...

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  • Chevrolet Master
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Even a slight leak at the intake manifold gasket will cause these lean codes, this is a common problem on this engine, I agree with the dealer about what needs to be repaired, I will not get into the price without a very detailed accounting of the job he proposes to do.

Posted on Feb 03, 2009

  • yadayada
    yadayada Feb 04, 2009

    U are right if the dealer mis-diagnosed it he bought the job until it is fixed.

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1 Answer

I have two engine codes 171 and 174 engine is running fine how do i repair them


Well code 171 is telling you the fuel mixture is too lean for bank one and code 174 is too lean bank two.
So the most common cause is low fuel pressure.

Apr 12, 2015 | 2004 Chrysler Crossfire

1 Answer

97 ford expedition has a code 171 and 174 bank 1 and 2 lean what do i do to fix this


Code 171 and 174 are for bank 1 and 2 running too lean. The engine has compensated as rich as it can go, and it is still to lean. This does not necessarily mean your mixture is bad, but something (a sensor) is telling the ECM to correct lean. The oxygen sensors alert the ECM to how lean/rich the exhaust is, and then the ECM trips a code. Maybe you have a bad oxy. sensor, but since there are 4 of them (2 per bank), I don't think they could all go at once.

Aug 31, 2013 | 1997 Ford Expedition

2 Answers

Running lean on bank 1 and bank 2 codes 171 174 runs great when codes are off once they come on loss of power not much but you can feel it


P0171 - System Too Lean (Bank 1)

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.


Causes: A code P0171 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak downstream of the MAF sensor.


Possible solutions include:
* In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect all vacuum and PCV hoses, replace if necessary
* Check for a dirty fuel filter and proper fuel pressure


Hope helps.

Mar 24, 2011 | 2000 Chevrolet Silverado 1500

2 Answers

Error codes po 134 po 153 po 154 po 155 po 171 po 174


PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

Feb 23, 2011 | 2004 Suzuki Grand Vitara

1 Answer

I have a 1999 chevy silverado with 5.3 v8 po171 & 174 and po420 in that order at times the truck seems to loap when at idel any ideas where to start?


Thes code 171 nad 174 are bank 1 and bank 2 system to lean(02 sensors). these are probably causing the 420 catalist efficency below threshold. The first place to start is all the vacuum lines. check for vacuum leaks. when you get the first two codes 99% of the time it is a vacuum leak. 1% is the mass air flow meter/sensor. And I don't believe you have one on your truck. to old. Also you have to check for vacuum leaks around the intake manifold. use WD40 , spray around the manifold gasket areas if the engine runs better you found a leak.

Feb 05, 2011 | 1999 Chevrolet Silverado 1500

3 Answers

2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

May 11, 2010 | 2003 Ford Ranger Regular Cab

2 Answers

1999 Chevy silverado 5.3 engine setting codes p171 p174 already replaced mas air flow and checked for leaks


oxygen sensor failure
P0171 System too Lean (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0174 System too Lean (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
hope this is a bit of a push in the right direction ...

Feb 02, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Check engine light on computer codes 171 174 171-HEGO sensor unable of snitch cylinder bank #1 fuel system at adaptive limit (1990 on) code 174 hego sensor snitching too slow, cylinder bank #1 (1990)


switch, we run off snitches. 171 174 banks 1 & 2 Lean. Most likely cause are Upper Intake Manifold Gaskets, failed seals. It's not 1990 on. It's 1996 and on OBD2.

Aug 03, 2009 | 2003 Ford Explorer Sport

1 Answer

2003 chevy silverado codes


Most likely cause is the intake manifold gasket

Feb 03, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

Codes #171 & 174


first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2) 

Jan 05, 2009 | 2004 Ford F150

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