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Trouble Code P0174

I have a 2003 bmw325i its running great but i went to warm it up the service engine lite came on so i took it to the gas station and it was down a quart of oil and they put it on the machine and the p0174 lean b2 code came up the guy turned off the service engine lite and said it was ok to drive so i took it to boston it runs great and the lite is still off . i checked the gas cap also i was womdering i was putting 87 fuel in it and right befor the lite went on i had put in premium gas and then mixed it with some 89 would that have set off that sensor because the car is running fine did not us any more gas than i usually do when i go to boston can you help me

Posted by Anonymous on

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  • Contributor
  • 8 Answers

Possible causes
Intake air leaks
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Lack of fuel
Faulty Mass Air Flow (MAF) sensor Incorrect Positive Crankcase Ventilation (PCV) hose connection

Read more: https://www.engine-codes.com/p0174_bmw.html

Posted on Apr 03, 2017

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  • Cars & Trucks Master
  • 15,557 Answers

It is not the fuel tank cap or the fuel that causes that error. If it does not come back on you are ok.

Posted on Apr 03, 2017

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 512 Answers

SOURCE: 97 jeep wrangler 2.5 running lean

check fuel pressure and check exhaust for leaks. exhaust leaks caqn play with the o2 sensor readings

Posted on Sep 25, 2008

SOURCE: 1999 pontiac grand prix . will not run

If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.
See http://www.greatautohelp.com

Posted on Oct 17, 2008

SOURCE: P0171 Code (Lean Fuel Bank 1) Engine light on

you nead to check all you vacuum lines for leaks it sounds like you have a vacuum leak or the o2 sensor is going bad on bank 1 **** i still say vacuum leak

Posted on Nov 23, 2008

  • 4 Answers

SOURCE: 2000 corolla with trouble code po420

If the code has cleared on its own then you need to disconnect the battery and re-connect it. This will clear the codes out of the memory. If you don't want to do this you can go to an auto parts strore and have them hook the little computer up to your car and they can clear out the code as well.

Posted on Sep 02, 2009

  • 1 Answer

SOURCE: 2000 kia sportage trouble code po171 once in

I have 2005 Kia Sportage with a check engine light. No other symptoms. I was told by Kia and Local mechanic that it is the fuel injectors. Error Code states that Fuel injectors are running lean. Put Master airflow- no change. Ran engine test with propane to run rich and trim never changed from 15. Car runs great. Kia dealer said that this is because we use Ethel in gas that it effects the alumium fuel rail delivery to the injectors and that it is necessary to change all of them .Kia Dealer wants $1,000.00 deposit to place order 6 fuel injectors from Kia. (Has anyone heard of that?)Also put fuel injector cleaner in tank.Does anyone have any suggestions before I spend over $1,000.00 to replace all 6 injectors or possible idea of what could be wrong?

Posted on Jan 07, 2010

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1 Answer

Trouble Code P0174


That code is for mixture adaptation lean. That means that the computer is getting the air fuel mix sorted out. Which could be partially attributed to the higher octane fuel. Typically it means there is an air leak in the induction system (intake manifold, air pipe after the Mass air flow sensor, or a vacuum hose or system) Check all connections on hoses and things under the hood. Make sure your gas cap is on tight. Take the car somewhere like Autozone and have the code deleted and see if it comes back. If it does, take it to the shop and have it checked out.

Nov 18, 2013 | Cars & Trucks

1 Answer

I have a 1998 isuzu hombre. it keeps throwing 3 engine codes. they are as follows po172-system to rich bank #1..2nd code is po405-egr sensor a low cicuit..and 3rd code po452 evap emission system presure...


The lean condition is usually the result of an O2 sensor fault, or a vacuum leak.
The EGR may be stuck and setting that code, you can remove clean and check wiring connections.
The po452 fault code is related to a low input signal from your EVAP system which is to do with your purge canisiter system...You could have a faulty sensor in this system or again bad wiring...

Troubleshoot these areas, clear all fault codes and see how she runs.

Good luck, i hope this helps.

Jul 06, 2011 | 1998 Isuzu Hombre

1 Answer

The check engine light came on and we started hearing a popping noise in the gas tank after moma went to an out the way gas station instead of going to our regular gas station that we always go to. The...


The ck engine light is telling you to have it scanned and it will have a trouble code to indicate where to look for the problem. You may have a Vent valve or purge valve problem, it may just be a coincidence that it happened after filling up.

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Service engine soon light on drove to work 15 miles away drove back home went to gas station turned my vehicle off and when I came back out started it the service engine soon light came on and is still on...


That light indicates a malfunction if the computerized engine management system (fuel injection, spark, cooling system). There are literaly dozens of things that can cause the light to come on. You will need to take it somewhere and get the code that caused the light to come on. Then we can help you find the problem. Some of the auto parts chains (AutoZone, O'Reilly's, Advance, etc.) will get the code for you at no charge. Then repost your problem and include the trouble code.

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1 Answer

My engine light is on


when the check engine light is on it is to alert you to the fact that a trouble code has been stored in the computers memory, there are over 200 such fault/trouble codes so guessing is not an option, u will need to have the OBD 2 engine control system tested and then post the trouble code back here, there will be a code.

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Check engine lite when automatic transmission shifts


only a sensor will make your light come on. most auto shops will check it with a code scanner for free. good luck

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1987 IROC, Ran out of gas,put gas in, now service engine light on


if you have high milieage you may have sucked in the gunk on the botton of your tank when you ran out of fuel check if you can hear the fuel pump running for about 2 sec with key on engine off if you hear nothing the problem is with your pump as they will burn out if they run dry for too long,if you hear the pump check for fuel pressure if pressure low check fuel filter to see if clogged by gunk from bottom of tank.

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1999 Ford Taurus engine lite stays on


I believe that the mechanic that you took your car to probably cleared the service code making the light go out. Since the problem was not fixed by whatever he did the light came back on. I suggest taking the car to either Autozone or other such parts store where they will usually read the code for you for free, and tell you what it means and what needs to be replaced. it is possible that there is a bad sensor.

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1 Answer

Check engine light ?


sometimes when the gas cap gets left off, it sets a code and turns on the check engine light. if the problem returns, it very well could be the egr valve....they tend to have a build up of carbon in the valve and can stick open.this problem can cause a rough idle, hesitation and stalling. you can remove the valve and use a screwdriver , with a torx bit i think, and turn the inside of the valve to break up the carbon deposits...should fix it, but with no code its hard to tell exactly what the problem is.

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