P0171 Volkswagen Code - System Too Lean Bank 1

I have a p0171 code. What would you check first. I am not a mechanic

What model and year is your VW? You could start by checking the air filter and for intake leaks (loose or damage hoses)

I have a 2000 Jetta vr6 with code p1176 is it bank 1 or bank 2 front or rear

Bank 1 it's where the #1 cylinder is.

Got P0171 code again after changing 1 of the Oxygen sensors, it previously had codes P0171 And P0174. The MAF sensor has also been replaced, any ideas???

If the P0171 was combined with the P0174 code, it's very likely that the problem is caused by an intake leak. Start by checking for intake leaks first.

I have a 04 vw passat reading code p0171 bank 1 were do I start to try and fix this problem

You could start by inspecting and cleaning the Mass Air Flow (MAF) sensor, also check for loose or damage vacuum hoses. If the MAF and hoses are OK, the you many need to replace the front oxygen sensor.

I have been having this code P0171 together with P12a2 for more than a year. The first change I made was the MAF sensor and when that did not fix the problem the following was done without any effect: got a smoke test done (with negative results), changed the fuel filter flange inside the gas tank, changed the PCV valve, changed the fuel pressure sensor on the fuel rail, changed the air intake filter, changed the spark plugs, did a chemical flush on the fuel injectors, check the cam follower for the fuel pump plunger (condition excellent). Things not yet done include the following: condition of the high pressure fuel pump not known, not changed the HO2S, not changed the air intake manifold gasket. A couple of visits to the local dealership caused only aggravation (these guys pretend to know where the fault is, but frankly the gentlemen at Autozone working for free were of more help than the dealership) If there is anything that needs to be done for the fault code to go away is not known to me and any help would be gratefully received. The car is VW Passat 2009 Wagon, 2.0T 4-Cyl TSI turbocharged engine.

Unfortunately there are too many things that could trigger the P0171. If you read online, everyone has a different opinion what the problem is, and I doubt there is a single repair for all the vehicles that will fix the problem. The most likely cause of the problem is an air intake leak, but it's not easy to find it.

I had similar problem a year ago on 98 jetta glx , cylinder misfires and running too lean on bank 1. Replaced plugs and wires, cleaned maf sensor, still had an issue then i replaced the coil pack. Ran perfect except had a miss now and again that ended up being faulty plug wire. Bought cheaper coil pack for $100. Problem may have just returned, may need another coil pack. Dunno yet

Spray starting around vacume hoses. If the engine jumps in idle you found your problem.

Starting fluid.

Check your n80 purge valve and replace it first. I got that code many times and that was the issue. If there is charcoal in it you might have to replace your charcoal canister.

Thank you for the information.

I have a P0171 code on my 2003 VW Golf GTI 1.8t , I changed the oxygen sensor, MAF sensor, Fuel filter, I put in fuel additive to clean my fuel injectors none of that worked to erase the check engine light so I took it to the dealer to get it diagnosed, came back picked it up they told me that I had a leaky CAT Converter and leaking vaccum hose, the vaccum hose I could understand but not sure about the cat converter that's a expensive part for me since I only make 13$ an hour just wondering if that would be a high possibility and which problem I should tackle next.

You should do the hose first. I have never seen a catalytic converter triggering the P0171 code.

Hi I've got a P0171 on my 2006 Jetta turbo as well and the noise from the engine bay is getting louder when the speed is up.

which is the problem if the engine jumps in idle?

Unfortunately there are many things that could cause that problem. Start by checking the engine oil level and condition. If engine oil level is OK, then check for intake leaks.

i have p0171 code on 2009 VW golf 2.0. symptoms of the car are that it seems to start ok in the cooler weather but idles rough for about 10-20 seconds then clears up. once car is hot and you shut it off, car will start ok again if its started right away but if left for a few minutes and not given time to cool down car won't start. have to wait till it cools down enough before it will start again! could this be the oxygen sensor and how do i diagnose before spending another couple hundred bucks and it not working?!?!? PLEASE HELP! THANK YOU!

parts i have replaced recently are : coolant temp sensor, MAF, crank position sensor, spark plugs, wires and ignition coil pack, fuel pump.

if the idle jumps after spraying...its more than likely where the leak is.

same story with my Passat 2009 same engine type ..replace most of the parts associate with the code P0171 and test was done all negative but my car runs good after all.. still check engine lights on..My Mechanic gives up and VW technician as well. put a lot of $$$ and Time .

I just replaced the timing belt water pump ECT sensor head and thermostat. And codes just keep popping up from no where! I have a 03 Jetta 1.8t p0171 p2181 came up today. I'm at my wit's end with this car. What should I do? I'm not a mechanic I don't know one where to start! HELP

Unfortunately there are many things that could trigger the P0171 code. I recommend start by checking for intake leaks or loose hoses. It's possible that you left a hose disconnected after replacing the water pump.

The P2181 is for the cooling system and the most likely cause is the ECT sensor, but since you already replace the sensor, make sure the connector is properly connected.

P2181 VOLKSWAGEN - Cooling System Performance
Read more: https://www.autocodes.com/p...

2006 vw Passat new cylinders, new spark plugs p0171 code also replaced pulse valve! Cleared the codes check engine light goes off for a few miles then the light came back on with the p0171 code and engine has a shake to it when I press the gas but gets worse the higher the speed! Any suggestions?

I have 06 jetta gli same code popping up and just had a new timing chain cover installed because the O rings were bad is it possible I'm getting this code because they failed to change the oil after replacing the timing chain cover? Oil level is high

jai un jetta 2007 2.5 essence ,il m'affiche code P0171,apres que j'ai change l'huile et filtre de la boite automatique

Wow! This is a no brainer. If you work for a, or at a repair facility, you guess, replace, hope, and pray that the most expensive part fixes the problem then you will make payroll. If it doesn't then you repeat the first part with the second most expensive part, and continue until you practically rebuild the whole vehicle. Customers love it when their vehicle is repaired, and business owners love big work orders with no comebacks.

On the other hand, if this is your vehicle, you need to read a lot in order to save even more money. Understand the basics, check the easiest things to check instead of the most obvious. You want to get the quickest reward for the least effort because time is money, and because its your money, you need to think smart and not lazy like the mechanic that has bills to pay such as tax liens, alimony, child support, a mistress, or in this day and age, a mr. ess. Take measurements, do tests, write them down. Diagnose, confirm the diagnoses, check the bad part properly, confirm the bad part is bad and don't just guess that its bad because it's the most feasible. Remember, this is your car and not your customer's.

A lean code says that you have more oxygen than fuel, period. Now ask yourself: What can cause more oxygen than fuel condition, other than travelling back in time to the Jurassic period where atmospheric oxygen was over 50% than the now less than 21% and dwindling. So, you either have unmetered air past the MAF sensor (also known as a vacuum leak), or you have poor fuel delivery.

Easiest is to start with a live data scanner and check the RPM variance as you spray a non to low volatile liquid around and past the MAF sensor, if there is a variance, you have found the, or one of the myriad of concerns.

Me, personally, I like to analyze freeze frame data and focus on the short and long fuel trims, but that's another post; else, I'll end up writing a book.

For those of you that don't like to read others opinions and answers, or suggestions, I'll just tell you the answer to your cars problem; it's the loose nut behind the steering wheel.

Can a P0171 code come from a leak or bad catalytic converter? My mechanic quotes me $1200 to change the catalytic converter and the two O2 sensor.

It's possible, not likely but it's possible. If you only getting the P0171 code, and there are no driveability problems, then you should get a second opinion, because the catalytic converter it's probably not the cause of the code.

I have a mk4 vw golf 1.6, I’ve changed the fuel filter and the front oxygen sensor. However my car is running very sluggish and only getting about 18mpg I’m wandering if changing the MAF sensor will make it run better

You should start by cleaning the MAF and changing the air filter.

Do u know where the MAF is located on my golf as the air filter is under the top cover on my engine.

What year is your Golf?

It’s a 2003 model not 1953!

The MAF is inle with the air filter

That’s different to mine, my air filter is under the plastic engine top and that area is empty on my car, my oil cap isn’t on the bottom left side of the plastic cover and the dip stick is to the side on the left as well

Unfortunately I don't have the factory service manual for your model year, but I found the following online:

"A MAF will be on the intake pipe (Which is attached to the engine cover). If there isn't one, it has a MAP sensor.
If is a MAP sensor, is on the intake manifold just beside the dipstick."

I hope that helps.

Hi, I have now changed the map sensor, however the car is still not running right. Any suggestions as to what else could be causing this issue? My partner thinks it could be the automatic choke? Could this still cause it to run lean?

Hi this is what my obd is saying