Question about 2004 Audi A4

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Lean system code for lean system showing and have done almost everything new plugs,new fuel filter,new coils but stil showing system lean what could be the issue

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  • amendez7 Feb 13, 2009

    p0171 bank 1 system lean have had all hoses checked and o2 sensor as well but code still shows up

  • yadayada
    yadayada May 11, 2010

    what is the code, lean codes are usually caused by vacuum leaks, defective sensors or a lean biased MAF sensor, not coils & plugs, u need to take this one to the dealer, it is obvious u don't understand electronic engine controls and how they work, cause and effect wise anyway.

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O2 SENSORS

Posted on Feb 13, 2009


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What are the probable causes of DTCs P0300 and P0316?


code p 2274 refers to heated oxygen sensor(HO2S) 3 bank 1 signal stuck lean or oxygen sensor(O2S) signal stuck lean===causes for both--wiring ---HO2S--fuel pressure --injectors --intake leak
code p 0300 refers to random /multiple misfires detected ===causes --spark plugs -- HT leads injector/s--ignition coils --low compression --wiring
code p 0316 refers to misfire detected during start up---first 1000 revolutions ===causes --engine mechanical fault---wiring---ignition / fuel system---injector
in all codes the injectors show up as a problem cause and if you couple that with low fuel pressure issues you may have a pointer to the real cause
have a pressure test done on the fuel manifold top check for pump fault , filter blockage and faulty pressure regulator
check /clean injector tips as they could be suffering from contamination problems and not operating freely ( good fuel injector cleaner)

Oct 11, 2015 | Cars & Trucks

2 Answers

My 2001 grad prix stumbels at acceleration once in awhile and in park sometimes there is no engine codes and i've changed pretty much everything plugs wires coils fuel filter and i even cleaned th


You did oxygen sensors at 100,000 miles

No exhaust leaks

No intake or evap leaks

Changing parts doesn't answer the question
Do you have ignition misfires

Egr problems

Mar 13, 2013 | 2000 Pontiac Grand Prix

1 Answer

Po104po105po1o6 misfires


First the po 171 is that bank 1 is running lean, as far as the codes po104-106, i think you made a mistake, the mifire codes for cylinders 4-6 would be po304, po305 and po306. the fiurst thing to check would the fuel preasure.

The reason i say fuel pressure is due to the misfiring and lean codes.
If the fuel pressure tests okay then check for intake manifold gasket leak, this is done with a smoke machine or with some throtle body cleaner spray. you will neeed to start the engine and spary around the intake gasket area as you watch for engine speed change.
A scan tool may be needed to watch fuel trim and o2 readings if the intake leak is small.
The other problem could be sparkplug failure or bad coil and last sparkplug wires if this is not a coil on plug system.
Acoil on plug system would be a system with out sparkplug wires going to each sparkplug, instead there is a separte coil on each sparkplug.
If this is a coil on plug ignition system i would start there and swap coils with the other cylinders and see if the misfire moves to those cylinder if it does then bad coils. hope this is helpful , good day

Mar 03, 2012 | 1998 Ford Explorer

1 Answer

I have a 2001 Chevy Venture. The vehicle is hard to start when it is cold or after it has been running. Once it starts,itruns fine. Also has a engine code lean bank one. I know one of the issues could be...


I have never heard of a major tune-up

All vehicle tuning has been done by
on board computers since 1980
some 30 years

Spark plug wires last the life of the vehicle
They only get replaced when they fail.
I had 1 wire fail in 46 years,personally

You do not have both an Ignition Module
as well as Coil Packs. They are installed
in two different systems

Any dash light you get & again they have
been there for 30 years,you retrieve any codes
within a couple days,diagnose code issues first
& repair. You have O2Sensor Codes
They wouldn't effect hard start problems

I would check fuel pressure with a gauge
Also Fuel Pressure Regulator

Vacuum Leaks
At least clean the MAF Sensor
Check TPS Sensor

Basically you need your vehicle tested in all
areas

There is a serious misconception that a
tune-up ,spark plugs etc are a cure all

I don't even start there when diagnosing
anything. You could throw away 2 plugs
& it would still start

I want to see what does work & how

Spark Plugs & other items you can get
from the vehicle history & past maintainance



May 27, 2011 | 2002 Chevrolet Venture Passanger

3 Answers

Fault codes P0355, P0171, P0174 on ford expedition 2001 what do i need to fix


The P0355 code is, "Ignition Coil E Primary/Secondary Circuit Malfunction" this has to do with the coil(s) and the coil may be going bad, or you have a bad wire / plug (connection) to the coil. P0171 is "System Too Lean (Bank 1)" and P0174 is " System Too Lean (Bank 2)" . The P017X codes mean your ox2 sensors are picking up a lean burn condition. Engine running to warm (hot) or your coolant temp sensor is not reading right or one of the ox2 sensors (Bank 1) is going bad. Hard to trouble shoot this from my computer desk.

May 12, 2011 | Ford Expedition Cars & Trucks

1 Answer

2003 GMC Sierra Has recently developed rough idle/lope at idle which sometimes goes away. Runs fine otherwise. Scan codes-Lean condition bank1 and bank2. Random misfires on all cylinders. Fuel pressure...


You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach

You learn the vehicles Systems,Test,then Replace,if you have a failed component.

Work on the Misfire Issues.
Then you lean O2 Codes will go away.

Not a the plugs.

Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors

Nov 24, 2010 | 2003 GMC Sierra 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

Check engine codes 97 ford exp v8 codes:0358 0171 0174


P0171 and 174 System Too Lean
Basically this means that an oxygen sensor in banks 1 and 2 detected a lean condition (too much oxygen in the exhaust).

These codes 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.

•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

P0358 Ignition Coil H Primary/Secondary Circuit Malfunction
Code P0358 is for cylinder #8.

Inspect the spark plug, coil, and coil boot on that cylinder for signs of damage. Replace as needed.

If no problems are found with the components, check the wiring harness from the coil to the Powertrain Control Module (PCM).

Potential Causes: Failed coil or boot
Failed spark plug
Harness problem

Feb 09, 2010 | 1997 Ford Expedition

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